#include "internal.h"
// Return number of bytes left to read for this connection
static int64_t left_to_read(const struct mg_connection *conn) {
return conn->content_len + conn->request_len - conn->num_bytes_read;
}
static int call_user(int type, struct mg_connection *conn, void *p) {
if (conn != NULL && conn->ctx != NULL) {
conn->event.user_data = conn->ctx->user_data;
conn->event.type = type;
conn->event.event_param = p;
conn->event.request_info = &conn->request_info;
conn->event.conn = conn;
}
return conn == NULL || conn->ctx == NULL || conn->ctx->event_handler == NULL ?
0 : conn->ctx->event_handler(&conn->event);
}
static FILE *mg_fopen(const char *path, const char *mode) {
#ifdef _WIN32
wchar_t wbuf[PATH_MAX], wmode[20];
to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
MultiByteToWideChar(CP_UTF8, 0, mode, -1, wmode, ARRAY_SIZE(wmode));
return _wfopen(wbuf, wmode);
#else
return fopen(path, mode);
#endif
}
static void sockaddr_to_string(char *buf, size_t len,
const union usa *usa) {
buf[0] = '\0';
#if defined(USE_IPV6)
inet_ntop(usa->sa.sa_family, usa->sa.sa_family == AF_INET ?
(void *) &usa->sin.sin_addr :
(void *) &usa->sin6.sin6_addr, buf, len);
#elif defined(_WIN32)
// Only Windoze Vista (and newer) have inet_ntop()
strncpy(buf, inet_ntoa(usa->sin.sin_addr), len);
#else
inet_ntop(usa->sa.sa_family, (void *) &usa->sin.sin_addr, buf, len);
#endif
}
// Print error message to the opened error log stream.
static void cry(struct mg_connection *conn, const char *fmt, ...) {
char buf[MG_BUF_LEN], src_addr[IP_ADDR_STR_LEN];
va_list ap;
FILE *fp;
time_t timestamp;
va_start(ap, fmt);
(void) vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
// Do not lock when getting the callback value, here and below.
// I suppose this is fine, since function cannot disappear in the
// same way string option can.
if (call_user(MG_EVENT_LOG, conn, buf) == 0) {
fp = conn->ctx == NULL || conn->ctx->config[ERROR_LOG_FILE] == NULL ? NULL :
fopen(conn->ctx->config[ERROR_LOG_FILE], "a+");
if (fp != NULL) {
flockfile(fp);
timestamp = time(NULL);
sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
fprintf(fp, "[%010lu] [error] [client %s] ", (unsigned long) timestamp,
src_addr);
if (conn->request_info.request_method != NULL) {
fprintf(fp, "%s %s: ", conn->request_info.request_method,
conn->request_info.uri);
}
fprintf(fp, "%s", buf);
fputc('\n', fp);
funlockfile(fp);
fclose(fp);
}
}
}
const char *mg_version(void) {
return MONGOOSE_VERSION;
}
// HTTP 1.1 assumes keep alive if "Connection:" header is not set
// This function must tolerate situations when connection info is not
// set up, for example if request parsing failed.
static int should_keep_alive(const struct mg_connection *conn) {
const char *http_version = conn->request_info.http_version;
const char *header = mg_get_header(conn, "Connection");
if (conn->must_close ||
conn->status_code == 401 ||
mg_strcasecmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes") != 0 ||
(header != NULL && mg_strcasecmp(header, "keep-alive") != 0) ||
(header == NULL && http_version && strcmp(http_version, "1.1"))) {
return 0;
}
return 1;
}
static const char *suggest_connection_header(const struct mg_connection *conn) {
return should_keep_alive(conn) ? "keep-alive" : "close";
}
static void send_http_error(struct mg_connection *conn, int status,
const char *reason, const char *fmt, ...) {
char buf[MG_BUF_LEN];
va_list ap;
int len = 0;
conn->status_code = status;
buf[0] = '\0';
// Errors 1xx, 204 and 304 MUST NOT send a body
if (status > 199 && status != 204 && status != 304) {
len = mg_snprintf(buf, sizeof(buf), "Error %d: %s", status, reason);
buf[len++] = '\n';
va_start(ap, fmt);
len += mg_vsnprintf(buf + len, sizeof(buf) - len, fmt, ap);
va_end(ap);
}
DEBUG_TRACE(("[%s]", buf));
mg_printf(conn, "HTTP/1.1 %d %s\r\n"
"Content-Length: %d\r\n"
"Connection: %s\r\n\r\n", status, reason, len,
suggest_connection_header(conn));
conn->num_bytes_sent += mg_printf(conn, "%s", buf);
}
// Write data to the IO channel - opened file descriptor, socket or SSL
// descriptor. Return number of bytes written.
static int64_t push(FILE *fp, SOCKET sock, SSL *ssl, const char *buf,
int64_t len) {
int64_t sent;
int n, k;
(void) ssl; // Get rid of warning
sent = 0;
while (sent < len) {
// How many bytes we send in this iteration
k = len - sent > INT_MAX ? INT_MAX : (int) (len - sent);
if (ssl != NULL) {
n = SSL_write(ssl, buf + sent, k);
} else if (fp != NULL) {
n = (int) fwrite(buf + sent, 1, (size_t) k, fp);
if (ferror(fp))
n = -1;
} else {
n = send(sock, buf + sent, (size_t) k, MSG_NOSIGNAL);
}
if (n <= 0)
break;
sent += n;
}
return sent;
}
// Read from IO channel - opened file descriptor, socket, or SSL descriptor.
// Return negative value on error, or number of bytes read on success.
static int pull(FILE *fp, struct mg_connection *conn, char *buf, int len) {
int nread;
if (len <= 0) return 0;
if (fp != NULL) {
// Use read() instead of fread(), because if we're reading from the CGI
// pipe, fread() may block until IO buffer is filled up. We cannot afford
// to block and must pass all read bytes immediately to the client.
nread = read(fileno(fp), buf, (size_t) len);
#ifndef NO_SSL
} else if (conn->ssl != NULL) {
nread = SSL_read(conn->ssl, buf, len);
#endif
} else {
nread = recv(conn->client.sock, buf, (size_t) len, 0);
}
if (nread > 0) {
conn->num_bytes_read += nread;
}
return conn->ctx->stop_flag ? -1 : nread;
}
static int pull_all(FILE *fp, struct mg_connection *conn, char *buf, int len) {
int n, nread = 0;
while (len > 0 && conn->ctx->stop_flag == 0) {
n = pull(fp, conn, buf + nread, len);
if (n < 0) {
nread = n; // Propagate the error
break;
} else if (n == 0) {
break; // No more data to read
} else {
nread += n;
len -= n;
}
}
return nread;
}
int mg_read(struct mg_connection *conn, void *buf, int len) {
int n, buffered_len, nread = 0;
int64_t left;
if (conn->content_len <= 0) {
return 0;
}
// conn->buf body
// |=================|==========|===============|
// |<--request_len-->| |
// |<-----------data_len------->| conn->buf + conn->buf_size
// First, check for data buffered in conn->buf by read_request().
if (len > 0 && (buffered_len = conn->data_len - conn->request_len) > 0) {
char *body = conn->buf + conn->request_len;
if (buffered_len > len) buffered_len = len;
if (buffered_len > conn->content_len) buffered_len = (int)conn->content_len;
memcpy(buf, body, (size_t) buffered_len);
memmove(body, body + buffered_len,
&conn->buf[conn->data_len] - &body[buffered_len]);
len -= buffered_len;
conn->data_len -= buffered_len;
nread += buffered_len;
}
// Read data from the socket.
if (len > 0 && (left = left_to_read(conn)) > 0) {
if (left < len) {
len = (int) left;
}
n = pull_all(NULL, conn, (char *) buf + nread, (int) len);
nread = n >= 0 ? nread + n : n;
}
return nread;
}
int mg_write(struct mg_connection *conn, const void *buf, int len) {
time_t now;
int64_t n, total, allowed;
if (conn->throttle > 0) {
if ((now = time(NULL)) != conn->last_throttle_time) {
conn->last_throttle_time = now;
conn->last_throttle_bytes = 0;
}
allowed = conn->throttle - conn->last_throttle_bytes;
if (allowed > (int64_t) len) {
allowed = len;
}
if ((total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
(int64_t) allowed)) == allowed) {
buf = (char *) buf + total;
conn->last_throttle_bytes += total;
while (total < (int64_t) len && conn->ctx->stop_flag == 0) {
allowed = conn->throttle > (int64_t) len - total ?
(int64_t) len - total : conn->throttle;
if ((n = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
(int64_t) allowed)) != allowed) {
break;
}
sleep(1);
conn->last_throttle_bytes = allowed;
conn->last_throttle_time = time(NULL);
buf = (char *) buf + n;
total += n;
}
}
} else {
total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
(int64_t) len);
}
return (int) total;
}
int mg_url_decode(const char *src, int src_len, char *dst,
int dst_len, int is_form_url_encoded) {
int i, j, a, b;
#define HEXTOI(x) (isdigit(x) ? x - '0' : x - 'W')
for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) {
if (src[i] == '%' && i < src_len - 2 &&
isxdigit(* (const unsigned char *) (src + i + 1)) &&
isxdigit(* (const unsigned char *) (src + i + 2))) {
a = tolower(* (const unsigned char *) (src + i + 1));
b = tolower(* (const unsigned char *) (src + i + 2));
dst[j] = (char) ((HEXTOI(a) << 4) | HEXTOI(b));
i += 2;
} else if (is_form_url_encoded && src[i] == '+') {
dst[j] = ' ';
} else {
dst[j] = src[i];
}
}
dst[j] = '\0'; // Null-terminate the destination
return i >= src_len ? j : -1;
}
int mg_get_var(const char *data, size_t data_len, const char *name,
char *dst, size_t dst_len) {
const char *p, *e, *s;
size_t name_len;
int len;
if (dst == NULL || dst_len == 0) {
len = -2;
} else if (data == NULL || name == NULL || data_len == 0) {
len = -1;
dst[0] = '\0';
} else {
name_len = strlen(name);
e = data + data_len;
len = -1;
dst[0] = '\0';
// data is "var1=val1&var2=val2...". Find variable first
for (p = data; p + name_len < e; p++) {
if ((p == data || p[-1] == '&') && p[name_len] == '=' &&
!mg_strncasecmp(name, p, name_len)) {
// Point p to variable value
p += name_len + 1;
// Point s to the end of the value
s = (const char *) memchr(p, '&', (size_t)(e - p));
if (s == NULL) {
s = e;
}
assert(s >= p);
// Decode variable into destination buffer
len = mg_url_decode(p, (size_t)(s - p), dst, dst_len, 1);
// Redirect error code from -1 to -2 (destination buffer too small).
if (len == -1) {
len = -2;
}
break;
}
}
}
return len;
}
int mg_get_cookie(const char *cookie_header, const char *var_name,
char *dst, size_t dst_size) {
const char *s, *p, *end;
int name_len, len = -1;
if (dst == NULL || dst_size == 0) {
len = -2;
} else if (var_name == NULL || (s = cookie_header) == NULL) {
len = -1;
dst[0] = '\0';
} else {
name_len = (int) strlen(var_name);
end = s + strlen(s);
dst[0] = '\0';
for (; (s = mg_strcasestr(s, var_name)) != NULL; s += name_len) {
if (s[name_len] == '=') {
s += name_len + 1;
if ((p = strchr(s, ' ')) == NULL)
p = end;
if (p[-1] == ';')
p--;
if (*s == '"' && p[-1] == '"' && p > s + 1) {
s++;
p--;
}
if ((size_t) (p - s) < dst_size) {
len = p - s;
mg_strlcpy(dst, s, (size_t) len + 1);
} else {
len = -3;
}
break;
}
}
}
return len;
}
// Return 1 if real file has been found, 0 otherwise
static int convert_uri_to_file_name(struct mg_connection *conn, char *buf,
size_t buf_len, struct file *filep) {
struct vec a, b;
const char *rewrite, *uri = conn->request_info.uri,
*root = conn->ctx->config[DOCUMENT_ROOT];
char *p;
int match_len;
char gz_path[PATH_MAX];
char const* accept_encoding;
// No filesystem access
if (root == NULL) {
return 0;
}
// Using buf_len - 1 because memmove() for PATH_INFO may shift part
// of the path one byte on the right.
// If document_root is NULL, leave the file empty.
mg_snprintf(buf, buf_len - 1, "%s%s", root, uri);
rewrite = conn->ctx->config[REWRITE];
while ((rewrite = next_option(rewrite, &a, &b)) != NULL) {
if ((match_len = match_prefix(a.ptr, a.len, uri)) > 0) {
mg_snprintf(buf, buf_len - 1, "%.*s%s", (int) b.len, b.ptr,
uri + match_len);
break;
}
}
if (mg_stat(buf, filep)) {
return 1;
}
// if we can't find the actual file, look for the file
// with the same name but a .gz extension. If we find it,
// use that and set the gzipped flag in the file struct
// to indicate that the response need to have the content-
// encoding: gzip header
// we can only do this if the browser declares support
if ((accept_encoding = mg_get_header(conn, "Accept-Encoding")) != NULL) {
if (strstr(accept_encoding,"gzip") != NULL) {
snprintf(gz_path, sizeof(gz_path), "%s.gz", buf);
if (mg_stat(gz_path, filep)) {
filep->gzipped = 1;
return 1;
}
}
}
// Support PATH_INFO for CGI scripts.
for (p = buf + strlen(root == NULL ? "" : root); *p != '\0'; p++) {
if (*p == '/') {
*p = '\0';
if (match_prefix(conn->ctx->config[CGI_EXTENSIONS],
strlen(conn->ctx->config[CGI_EXTENSIONS]), buf) > 0 &&
mg_stat(buf, filep)) {
// Shift PATH_INFO block one character right, e.g.
// "/x.cgi/foo/bar\x00" => "/x.cgi\x00/foo/bar\x00"
// conn->path_info is pointing to the local variable "path" declared
// in handle_request(), so PATH_INFO is not valid after
// handle_request returns.
conn->path_info = p + 1;
memmove(p + 2, p + 1, strlen(p + 1) + 1); // +1 is for trailing \0
p[1] = '/';
return 1;
} else {
*p = '/';
}
}
}
return 0;
}
// Check whether full request is buffered. Return:
// -1 if request is malformed
// 0 if request is not yet fully buffered
// >0 actual request length, including last \r\n\r\n
static int get_request_len(const char *buf, int buf_len) {
int i;
for (i = 0; i < buf_len; i++) {
// Control characters are not allowed but >=128 is.
// Abort scan as soon as one malformed character is found;
// don't let subsequent \r\n\r\n win us over anyhow
if (!isprint(* (const unsigned char *) &buf[i]) && buf[i] != '\r' &&
buf[i] != '\n' && * (const unsigned char *) &buf[i] < 128) {
return -1;
} else if (buf[i] == '\n' && i + 1 < buf_len && buf[i + 1] == '\n') {
return i + 2;
} else if (buf[i] == '\n' && i + 2 < buf_len && buf[i + 1] == '\r' &&
buf[i + 2] == '\n') {
return i + 3;
}
}
return 0;
}
// Protect against directory disclosure attack by removing '..',
// excessive '/' and '\' characters
static void remove_double_dots_and_double_slashes(char *s) {
char *p = s;
while (*s != '\0') {
*p++ = *s++;
if (s[-1] == '/' || s[-1] == '\\') {
// Skip all following slashes, backslashes and double-dots
while (s[0] != '\0') {
if (s[0] == '/' || s[0] == '\\') {
s++;
} else if (s[0] == '.' && s[1] == '.') {
s += 2;
} else {
break;
}
}
}
}
*p = '\0';
}
static const struct {
const char *extension;
size_t ext_len;
const char *mime_type;
} builtin_mime_types[] = {
{".html", 5, "text/html"},
{".htm", 4, "text/html"},
{".shtm", 5, "text/html"},
{".shtml", 6, "text/html"},
{".css", 4, "text/css"},
{".js", 3, "application/x-javascript"},
{".ico", 4, "image/x-icon"},
{".gif", 4, "image/gif"},
{".jpg", 4, "image/jpeg"},
{".jpeg", 5, "image/jpeg"},
{".png", 4, "image/png"},
{".svg", 4, "image/svg+xml"},
{".txt", 4, "text/plain"},
{".torrent", 8, "application/x-bittorrent"},
{".wav", 4, "audio/x-wav"},
{".mp3", 4, "audio/x-mp3"},
{".mid", 4, "audio/mid"},
{".m3u", 4, "audio/x-mpegurl"},
{".ogg", 4, "application/ogg"},
{".ram", 4, "audio/x-pn-realaudio"},
{".xml", 4, "text/xml"},
{".json", 5, "text/json"},
{".xslt", 5, "application/xml"},
{".xsl", 4, "application/xml"},
{".ra", 3, "audio/x-pn-realaudio"},
{".doc", 4, "application/msword"},
{".exe", 4, "application/octet-stream"},
{".zip", 4, "application/x-zip-compressed"},
{".xls", 4, "application/excel"},
{".tgz", 4, "application/x-tar-gz"},
{".tar", 4, "application/x-tar"},
{".gz", 3, "application/x-gunzip"},
{".arj", 4, "application/x-arj-compressed"},
{".rar", 4, "application/x-arj-compressed"},
{".rtf", 4, "application/rtf"},
{".pdf", 4, "application/pdf"},
{".swf", 4, "application/x-shockwave-flash"},
{".mpg", 4, "video/mpeg"},
{".webm", 5, "video/webm"},
{".mpeg", 5, "video/mpeg"},
{".mov", 4, "video/quicktime"},
{".mp4", 4, "video/mp4"},
{".m4v", 4, "video/x-m4v"},
{".asf", 4, "video/x-ms-asf"},
{".avi", 4, "video/x-msvideo"},
{".bmp", 4, "image/bmp"},
{".ttf", 4, "application/x-font-ttf"},
{NULL, 0, NULL}
};
const char *mg_get_builtin_mime_type(const char *path) {
const char *ext;
size_t i, path_len;
path_len = strlen(path);
for (i = 0; builtin_mime_types[i].extension != NULL; i++) {
ext = path + (path_len - builtin_mime_types[i].ext_len);
if (path_len > builtin_mime_types[i].ext_len &&
mg_strcasecmp(ext, builtin_mime_types[i].extension) == 0) {
return builtin_mime_types[i].mime_type;
}
}
return "text/plain";
}
// Look at the "path" extension and figure what mime type it has.
// Store mime type in the vector.
static void get_mime_type(struct mg_context *ctx, const char *path,
struct vec *vec) {
struct vec ext_vec, mime_vec;
const char *list, *ext;
size_t path_len;
path_len = strlen(path);
// Scan user-defined mime types first, in case user wants to
// override default mime types.
list = ctx->config[EXTRA_MIME_TYPES];
while ((list = next_option(list, &ext_vec, &mime_vec)) != NULL) {
// ext now points to the path suffix
ext = path + path_len - ext_vec.len;
if (mg_strncasecmp(ext, ext_vec.ptr, ext_vec.len) == 0) {
*vec = mime_vec;
return;
}
}
vec->ptr = mg_get_builtin_mime_type(path);
vec->len = strlen(vec->ptr);
}
void mg_url_encode(const char *src, char *dst, size_t dst_len) {
static const char *dont_escape = "._-$,;~()";
static const char *hex = "0123456789abcdef";
const char *end = dst + dst_len - 1;
for (; *src != '\0' && dst < end; src++, dst++) {
if (isalnum(*(const unsigned char *) src) ||
strchr(dont_escape, * (const unsigned char *) src) != NULL) {
*dst = *src;
} else if (dst + 2 < end) {
dst[0] = '%';
dst[1] = hex[(* (const unsigned char *) src) >> 4];
dst[2] = hex[(* (const unsigned char *) src) & 0xf];
dst += 2;
}
}
*dst = '\0';
}
static void print_dir_entry(const struct de *de) {
char size[64], mod[64], href[PATH_MAX * 3];
const char *slash = de->file.is_directory ? "/" : "";
if (de->file.is_directory) {
mg_snprintf(size, sizeof(size), "%s", "[DIRECTORY]");
} else {
// We use (signed) cast below because MSVC 6 compiler cannot
// convert unsigned __int64 to double. Sigh.
if (de->file.size < 1024) {
mg_snprintf(size, sizeof(size), "%d", (int) de->file.size);
} else if (de->file.size < 0x100000) {
mg_snprintf(size, sizeof(size),
"%.1fk", (double) de->file.size / 1024.0);
} else if (de->file.size < 0x40000000) {
mg_snprintf(size, sizeof(size),
"%.1fM", (double) de->file.size / 1048576);
} else {
mg_snprintf(size, sizeof(size),
"%.1fG", (double) de->file.size / 1073741824);
}
}
strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M",
localtime(&de->file.modification_time));
mg_url_encode(de->file_name, href, sizeof(href));
de->conn->num_bytes_sent += mg_chunked_printf(de->conn,
"| %s%s | "
" %s | %s |
\n",
de->conn->request_info.uri, href, slash, de->file_name, slash, mod, size);
}
// This function is called from send_directory() and used for
// sorting directory entries by size, or name, or modification time.
// On windows, __cdecl specification is needed in case if project is built
// with __stdcall convention. qsort always requires __cdels callback.
static int WINCDECL compare_dir_entries(const void *p1, const void *p2) {
const struct de *a = (const struct de *) p1, *b = (const struct de *) p2;
const char *query_string = a->conn->request_info.query_string;
int cmp_result = 0;
if (query_string == NULL) {
query_string = "na";
}
if (a->file.is_directory && !b->file.is_directory) {
return -1; // Always put directories on top
} else if (!a->file.is_directory && b->file.is_directory) {
return 1; // Always put directories on top
} else if (*query_string == 'n') {
cmp_result = strcmp(a->file_name, b->file_name);
} else if (*query_string == 's') {
cmp_result = a->file.size == b->file.size ? 0 :
a->file.size > b->file.size ? 1 : -1;
} else if (*query_string == 'd') {
cmp_result = a->file.modification_time == b->file.modification_time ? 0 :
a->file.modification_time > b->file.modification_time ? 1 : -1;
}
return query_string[1] == 'd' ? -cmp_result : cmp_result;
}
static int must_hide_file(struct mg_connection *conn, const char *path) {
const char *pw_pattern = "**" PASSWORDS_FILE_NAME "$";
const char *pattern = conn->ctx->config[HIDE_FILES];
return match_prefix(pw_pattern, strlen(pw_pattern), path) > 0 ||
(pattern != NULL && match_prefix(pattern, strlen(pattern), path) > 0);
}
static int scan_directory(struct mg_connection *conn, const char *dir,
void *data, void (*cb)(struct de *, void *)) {
char path[PATH_MAX];
struct dirent *dp;
DIR *dirp;
struct de de;
if ((dirp = opendir(dir)) == NULL) {
return 0;
} else {
de.conn = conn;
while ((dp = readdir(dirp)) != NULL) {
// Do not show current dir and hidden files
if (!strcmp(dp->d_name, ".") ||
!strcmp(dp->d_name, "..") ||
must_hide_file(conn, dp->d_name)) {
continue;
}
mg_snprintf(path, sizeof(path), "%s%c%s", dir, '/', dp->d_name);
// If we don't memset stat structure to zero, mtime will have
// garbage and strftime() will segfault later on in
// print_dir_entry(). memset is required only if mg_stat()
// fails. For more details, see
// http://code.google.com/p/mongoose/issues/detail?id=79
memset(&de.file, 0, sizeof(de.file));
mg_stat(path, &de.file);
de.file_name = dp->d_name;
cb(&de, data);
}
(void) closedir(dirp);
}
return 1;
}
static int remove_directory(struct mg_connection *conn, const char *dir) {
char path[PATH_MAX];
struct dirent *dp;
DIR *dirp;
struct de de;
if ((dirp = opendir(dir)) == NULL) {
return 0;
} else {
de.conn = conn;
while ((dp = readdir(dirp)) != NULL) {
// Do not show current dir, but show hidden files
if (!strcmp(dp->d_name, ".") ||
!strcmp(dp->d_name, "..")) {
continue;
}
mg_snprintf(path, sizeof(path), "%s%c%s", dir, '/', dp->d_name);
// If we don't memset stat structure to zero, mtime will have
// garbage and strftime() will segfault later on in
// print_dir_entry(). memset is required only if mg_stat()
// fails. For more details, see
// http://code.google.com/p/mongoose/issues/detail?id=79
memset(&de.file, 0, sizeof(de.file));
mg_stat(path, &de.file);
if(de.file.modification_time) {
if(de.file.is_directory) {
remove_directory(conn, path);
} else {
mg_remove(path);
}
}
}
(void) closedir(dirp);
rmdir(dir);
}
return 1;
}
struct dir_scan_data {
struct de *entries;
int num_entries;
int arr_size;
};
// Behaves like realloc(), but frees original pointer on failure
static void *realloc2(void *ptr, size_t size) {
void *new_ptr = realloc(ptr, size);
if (new_ptr == NULL) {
free(ptr);
}
return new_ptr;
}
static void dir_scan_callback(struct de *de, void *data) {
struct dir_scan_data *dsd = (struct dir_scan_data *) data;
if (dsd->entries == NULL || dsd->num_entries >= dsd->arr_size) {
dsd->arr_size *= 2;
dsd->entries = (struct de *) realloc2(dsd->entries, dsd->arr_size *
sizeof(dsd->entries[0]));
}
if (dsd->entries == NULL) {
// TODO(lsm): propagate an error to the caller
dsd->num_entries = 0;
} else {
dsd->entries[dsd->num_entries].file_name = mg_strdup(de->file_name);
dsd->entries[dsd->num_entries].file = de->file;
dsd->entries[dsd->num_entries].conn = de->conn;
dsd->num_entries++;
}
}
static void handle_directory_request(struct mg_connection *conn,
const char *dir) {
int i, sort_direction;
struct dir_scan_data data = { NULL, 0, 128 };
if (!scan_directory(conn, dir, &data, dir_scan_callback)) {
send_http_error(conn, 500, "Cannot open directory",
"Error: opendir(%s): %s", dir, strerror(ERRNO));
return;
}
sort_direction = conn->request_info.query_string != NULL &&
conn->request_info.query_string[1] == 'd' ? 'a' : 'd';
conn->must_close = 1;
mg_printf(conn, "%s",
"HTTP/1.1 200 OK\r\n"
"Transfer-Encoding: Chunked\r\n"
"Content-Type: text/html; charset=utf-8\r\n\r\n");
conn->num_bytes_sent += mg_chunked_printf(conn,
"Index of %s"
""
"Index of %s
"
"| Name | "
"Modified | "
"Size |
|---|
"
"
|
",
conn->request_info.uri, conn->request_info.uri,
sort_direction, sort_direction, sort_direction);
// Print first entry - link to a parent directory
conn->num_bytes_sent += mg_chunked_printf(conn,
"| %s | "
" %s | %s |
\n",
conn->request_info.uri, "..", "Parent directory", "-", "-");
// Sort and print directory entries
qsort(data.entries, (size_t) data.num_entries, sizeof(data.entries[0]),
compare_dir_entries);
for (i = 0; i < data.num_entries; i++) {
print_dir_entry(&data.entries[i]);
free(data.entries[i].file_name);
}
free(data.entries);
conn->num_bytes_sent += mg_chunked_printf(conn, "%s",
"
");
conn->num_bytes_sent += mg_write(conn, "0\r\n\r\n", 5);
conn->status_code = 200;
}
// Send len bytes from the opened file to the client.
static void send_file_data(struct mg_connection *conn, FILE *fp,
int64_t offset, int64_t len) {
char buf[MG_BUF_LEN];
int num_read, num_written, to_read;
// If offset is beyond file boundaries, don't send anything
if (offset > 0 && fseeko(fp, offset, SEEK_SET) != 0) {
return;
}
while (len > 0) {
// Calculate how much to read from the file in the buffer
to_read = sizeof(buf);
if ((int64_t) to_read > len) {
to_read = (int) len;
}
// Read from file, exit the loop on error
if ((num_read = fread(buf, 1, (size_t) to_read, fp)) <= 0) {
break;
}
// Send read bytes to the client, exit the loop on error
if ((num_written = mg_write(conn, buf, (size_t) num_read)) != num_read) {
break;
}
// Both read and were successful, adjust counters
conn->num_bytes_sent += num_written;
len -= num_written;
}
}
static int parse_range_header(const char *header, int64_t *a, int64_t *b) {
return sscanf(header, "bytes=%" INT64_FMT "-%" INT64_FMT, a, b);
}
static void gmt_time_string(char *buf, size_t buf_len, time_t *t) {
strftime(buf, buf_len, "%a, %d %b %Y %H:%M:%S GMT", gmtime(t));
}
static void construct_etag(char *buf, size_t buf_len,
const struct file *filep) {
snprintf(buf, buf_len, "\"%lx.%" INT64_FMT "\"",
(unsigned long) filep->modification_time, filep->size);
}
static void fclose_on_exec(FILE *fp) {
if (fp != NULL) {
#ifndef _WIN32
fcntl(fileno(fp), F_SETFD, FD_CLOEXEC);
#endif
}
}
static void handle_file_request(struct mg_connection *conn, const char *path,
struct file *filep) {
char date[64], lm[64], etag[64], range[64];
const char *msg = "OK", *hdr;
time_t curtime = time(NULL);
int64_t cl, r1, r2;
struct vec mime_vec;
int n;
char gz_path[PATH_MAX];
char const* encoding = "";
FILE *fp;
get_mime_type(conn->ctx, path, &mime_vec);
cl = filep->size;
conn->status_code = 200;
range[0] = '\0';
// if this file is in fact a pre-gzipped file, rewrite its filename
// it's important to rewrite the filename after resolving
// the mime type from it, to preserve the actual file's type
if (filep->gzipped) {
snprintf(gz_path, sizeof(gz_path), "%s.gz", path);
path = gz_path;
encoding = "Content-Encoding: gzip\r\n";
}
if ((fp = mg_fopen(path, "rb")) == NULL) {
send_http_error(conn, 500, http_500_error,
"fopen(%s): %s", path, strerror(ERRNO));
return;
}
fclose_on_exec(fp);
// If Range: header specified, act accordingly
r1 = r2 = 0;
hdr = mg_get_header(conn, "Range");
if (hdr != NULL && (n = parse_range_header(hdr, &r1, &r2)) > 0 &&
r1 >= 0 && r2 >= 0) {
// actually, range requests don't play well with a pre-gzipped
// file (since the range is specified in the uncmpressed space)
if (filep->gzipped) {
send_http_error(conn, 501, "Not Implemented",
"range requests in gzipped files are not supported");
return;
}
conn->status_code = 206;
cl = n == 2 ? (r2 > cl ? cl : r2) - r1 + 1: cl - r1;
mg_snprintf(range, sizeof(range),
"Content-Range: bytes "
"%" INT64_FMT "-%"
INT64_FMT "/%" INT64_FMT "\r\n",
r1, r1 + cl - 1, filep->size);
msg = "Partial Content";
}
// Prepare Etag, Date, Last-Modified headers. Must be in UTC, according to
// http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3
gmt_time_string(date, sizeof(date), &curtime);
gmt_time_string(lm, sizeof(lm), &filep->modification_time);
construct_etag(etag, sizeof(etag), filep);
(void) mg_printf(conn,
"HTTP/1.1 %d %s\r\n"
"Date: %s\r\n"
"Last-Modified: %s\r\n"
"Etag: %s\r\n"
"Content-Type: %.*s\r\n"
"Content-Length: %" INT64_FMT "\r\n"
"Connection: %s\r\n"
"Accept-Ranges: bytes\r\n"
"%s%s%s\r\n",
conn->status_code, msg, date, lm, etag, (int) mime_vec.len,
mime_vec.ptr, cl, suggest_connection_header(conn), range, encoding,
EXTRA_HTTP_HEADERS);
if (strcmp(conn->request_info.request_method, "HEAD") != 0) {
send_file_data(conn, fp, r1, cl);
}
fclose(fp);
}
void mg_send_file(struct mg_connection *conn, const char *path) {
struct file file = STRUCT_FILE_INITIALIZER;
if (mg_stat(path, &file)) {
handle_file_request(conn, path, &file);
} else {
send_http_error(conn, 404, "Not Found", "%s", "File not found");
}
}
// Parse HTTP headers from the given buffer, advance buffer to the point
// where parsing stopped.
static void parse_http_headers(char **buf, struct mg_request_info *ri) {
int i;
for (i = 0; i < (int) ARRAY_SIZE(ri->http_headers); i++) {
ri->http_headers[i].name = skip_quoted(buf, ":", " ", 0);
ri->http_headers[i].value = skip(buf, "\r\n");
if (ri->http_headers[i].name[0] == '\0')
break;
ri->num_headers = i + 1;
}
}
static int is_valid_http_method(const char *method) {
return !strcmp(method, "GET") || !strcmp(method, "POST") ||
!strcmp(method, "HEAD") || !strcmp(method, "CONNECT") ||
!strcmp(method, "PUT") || !strcmp(method, "DELETE") ||
!strcmp(method, "OPTIONS") || !strcmp(method, "PROPFIND")
|| !strcmp(method, "MKCOL")
;
}
// Parse HTTP request, fill in mg_request_info structure.
// This function modifies the buffer by NUL-terminating
// HTTP request components, header names and header values.
static int parse_http_message(char *buf, int len, struct mg_request_info *ri) {
int is_request, request_length = get_request_len(buf, len);
if (request_length > 0) {
// Reset attributes. DO NOT TOUCH is_ssl, remote_ip, remote_port
ri->remote_user = ri->request_method = ri->uri = ri->http_version = NULL;
ri->num_headers = 0;
buf[request_length - 1] = '\0';
// RFC says that all initial whitespaces should be ingored
while (*buf != '\0' && isspace(* (unsigned char *) buf)) {
buf++;
}
ri->request_method = skip(&buf, " ");
ri->uri = skip(&buf, " ");
ri->http_version = skip(&buf, "\r\n");
// HTTP message could be either HTTP request or HTTP response, e.g.
// "GET / HTTP/1.0 ...." or "HTTP/1.0 200 OK ..."
is_request = is_valid_http_method(ri->request_method);
if ((is_request && memcmp(ri->http_version, "HTTP/", 5) != 0) ||
(!is_request && memcmp(ri->request_method, "HTTP/", 5) != 0)) {
request_length = -1;
} else {
if (is_request) {
ri->http_version += 5;
}
parse_http_headers(&buf, ri);
}
}
return request_length;
}
// Keep reading the input (either opened file descriptor fd, or socket sock,
// or SSL descriptor ssl) into buffer buf, until \r\n\r\n appears in the
// buffer (which marks the end of HTTP request). Buffer buf may already
// have some data. The length of the data is stored in nread.
// Upon every read operation, increase nread by the number of bytes read.
static int read_request(FILE *fp, struct mg_connection *conn,
char *buf, int bufsiz, int *nread) {
int request_len, n = 0;
request_len = get_request_len(buf, *nread);
while (conn->ctx->stop_flag == 0 &&
*nread < bufsiz &&
request_len == 0 &&
(n = pull(fp, conn, buf + *nread, bufsiz - *nread)) > 0) {
*nread += n;
assert(*nread <= bufsiz);
request_len = get_request_len(buf, *nread);
}
return request_len <= 0 && n <= 0 ? -1 : request_len;
}
// For given directory path, substitute it to valid index file.
// Return 0 if index file has been found, -1 if not found.
// If the file is found, it's stats is returned in stp.
static int substitute_index_file(struct mg_connection *conn, char *path,
size_t path_len, struct file *filep) {
const char *list = conn->ctx->config[INDEX_FILES];
struct file file = STRUCT_FILE_INITIALIZER;
struct vec filename_vec;
size_t n = strlen(path);
int found = 0;
// The 'path' given to us points to the directory. Remove all trailing
// directory separator characters from the end of the path, and
// then append single directory separator character.
while (n > 0 && path[n - 1] == '/') {
n--;
}
path[n] = '/';
// Traverse index files list. For each entry, append it to the given
// path and see if the file exists. If it exists, break the loop
while ((list = next_option(list, &filename_vec, NULL)) != NULL) {
// Ignore too long entries that may overflow path buffer
if (filename_vec.len > path_len - (n + 2))
continue;
// Prepare full path to the index file
mg_strlcpy(path + n + 1, filename_vec.ptr, filename_vec.len + 1);
// Does it exist?
if (mg_stat(path, &file)) {
// Yes it does, break the loop
*filep = file;
found = 1;
break;
}
}
// If no index file exists, restore directory path
if (!found) {
path[n] = '\0';
}
return found;
}
// Return True if we should reply 304 Not Modified.
static int is_not_modified(const struct mg_connection *conn,
const struct file *filep) {
char etag[64];
const char *ims = mg_get_header(conn, "If-Modified-Since");
const char *inm = mg_get_header(conn, "If-None-Match");
construct_etag(etag, sizeof(etag), filep);
return (inm != NULL && !mg_strcasecmp(etag, inm)) ||
(ims != NULL && filep->modification_time <= parse_date_string(ims));
}
static int forward_body_data(struct mg_connection *conn, FILE *fp,
SOCKET sock, SSL *ssl) {
const char *expect, *body;
char buf[MG_BUF_LEN];
int nread, buffered_len, success = 0;
int64_t left;
expect = mg_get_header(conn, "Expect");
assert(fp != NULL);
if (conn->content_len == INT64_MAX) {
send_http_error(conn, 411, "Length Required", "%s", "");
} else if (expect != NULL && mg_strcasecmp(expect, "100-continue")) {
send_http_error(conn, 417, "Expectation Failed", "%s", "");
} else {
if (expect != NULL) {
(void) mg_printf(conn, "%s", "HTTP/1.1 100 Continue\r\n\r\n");
}
buffered_len = conn->data_len - conn->request_len;
body = conn->buf + conn->request_len;
assert(buffered_len >= 0);
if (buffered_len > 0) {
if ((int64_t) buffered_len > conn->content_len) {
buffered_len = (int) conn->content_len;
}
push(fp, sock, ssl, body, (int64_t) buffered_len);
memmove((char *) body, body + buffered_len, buffered_len);
conn->data_len -= buffered_len;
}
nread = 0;
while (conn->num_bytes_read < conn->content_len + conn->request_len) {
left = left_to_read(conn);
if (left > (int64_t) sizeof(buf)) {
left = sizeof(buf);
}
nread = pull(NULL, conn, buf, (int) left);
if (nread <= 0 || push(fp, sock, ssl, buf, nread) != nread) {
break;
}
}
if (left_to_read(conn) == 0) {
success = nread >= 0;
}
// Each error code path in this function must send an error
if (!success) {
send_http_error(conn, 577, http_500_error, "%s", "");
}
}
return success;
}
#if !defined(NO_CGI)
// This structure helps to create an environment for the spawned CGI program.
// Environment is an array of "VARIABLE=VALUE\0" ASCIIZ strings,
// last element must be NULL.
// However, on Windows there is a requirement that all these VARIABLE=VALUE\0
// strings must reside in a contiguous buffer. The end of the buffer is
// marked by two '\0' characters.
// We satisfy both worlds: we create an envp array (which is vars), all
// entries are actually pointers inside buf.
struct cgi_env_block {
struct mg_connection *conn;
char buf[CGI_ENVIRONMENT_SIZE]; // Environment buffer
int len; // Space taken
char *vars[MAX_CGI_ENVIR_VARS]; // char **envp
int nvars; // Number of variables
};
static char *addenv(struct cgi_env_block *block,
PRINTF_FORMAT_STRING(const char *fmt), ...)
PRINTF_ARGS(2, 3);
// Append VARIABLE=VALUE\0 string to the buffer, and add a respective
// pointer into the vars array.
static char *addenv(struct cgi_env_block *block, const char *fmt, ...) {
int n, space;
char *added;
va_list ap;
// Calculate how much space is left in the buffer
space = sizeof(block->buf) - block->len - 2;
assert(space >= 0);
// Make a pointer to the free space int the buffer
added = block->buf + block->len;
// Copy VARIABLE=VALUE\0 string into the free space
va_start(ap, fmt);
n = mg_vsnprintf(added, (size_t) space, fmt, ap);
va_end(ap);
// Make sure we do not overflow buffer and the envp array
if (n > 0 && n + 1 < space &&
block->nvars < (int) ARRAY_SIZE(block->vars) - 2) {
// Append a pointer to the added string into the envp array
block->vars[block->nvars++] = added;
// Bump up used length counter. Include \0 terminator
block->len += n + 1;
} else {
cry(block->conn, "%s: CGI env buffer truncated for [%s]", __func__, fmt);
}
return added;
}
static void prepare_cgi_environment(struct mg_connection *conn,
const char *prog,
struct cgi_env_block *blk) {
const struct mg_request_info *ri = &conn->request_info;
const char *s, *slash;
struct vec var_vec;
char *p, src_addr[IP_ADDR_STR_LEN];
int i;
blk->len = blk->nvars = 0;
blk->conn = conn;
sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
addenv(blk, "SERVER_NAME=%s", conn->ctx->config[AUTHENTICATION_DOMAIN]);
addenv(blk, "SERVER_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);
addenv(blk, "DOCUMENT_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);
addenv(blk, "SERVER_SOFTWARE=%s/%s", "Mongoose", mg_version());
// Prepare the environment block
addenv(blk, "%s", "GATEWAY_INTERFACE=CGI/1.1");
addenv(blk, "%s", "SERVER_PROTOCOL=HTTP/1.1");
addenv(blk, "%s", "REDIRECT_STATUS=200"); // For PHP
// TODO(lsm): fix this for IPv6 case
addenv(blk, "SERVER_PORT=%d", ntohs(conn->client.lsa.sin.sin_port));
addenv(blk, "REQUEST_METHOD=%s", ri->request_method);
addenv(blk, "REMOTE_ADDR=%s", src_addr);
addenv(blk, "REMOTE_PORT=%d", ri->remote_port);
addenv(blk, "REQUEST_URI=%s%s%s", ri->uri,
ri->query_string == NULL ? "" : "?",
ri->query_string == NULL ? "" : ri->query_string);
// SCRIPT_NAME
if (conn->path_info != NULL) {
addenv(blk, "SCRIPT_NAME=%.*s",
(int) (strlen(ri->uri) - strlen(conn->path_info)), ri->uri);
addenv(blk, "PATH_INFO=%s", conn->path_info);
} else {
s = strrchr(prog, '/');
slash = strrchr(ri->uri, '/');
addenv(blk, "SCRIPT_NAME=%.*s%s",
slash == NULL ? 0 : (int) (slash - ri->uri), ri->uri,
s == NULL ? prog : s);
}
addenv(blk, "SCRIPT_FILENAME=%s", prog);
addenv(blk, "PATH_TRANSLATED=%s", prog);
addenv(blk, "HTTPS=%s", conn->ssl == NULL ? "off" : "on");
if ((s = mg_get_header(conn, "Content-Type")) != NULL)
addenv(blk, "CONTENT_TYPE=%s", s);
if (ri->query_string != NULL) {
addenv(blk, "QUERY_STRING=%s", ri->query_string);
}
if ((s = mg_get_header(conn, "Content-Length")) != NULL)
addenv(blk, "CONTENT_LENGTH=%s", s);
if ((s = getenv("PATH")) != NULL)
addenv(blk, "PATH=%s", s);
#if defined(_WIN32)
if ((s = getenv("COMSPEC")) != NULL) {
addenv(blk, "COMSPEC=%s", s);
}
if ((s = getenv("SYSTEMROOT")) != NULL) {
addenv(blk, "SYSTEMROOT=%s", s);
}
if ((s = getenv("SystemDrive")) != NULL) {
addenv(blk, "SystemDrive=%s", s);
}
if ((s = getenv("ProgramFiles")) != NULL) {
addenv(blk, "ProgramFiles=%s", s);
}
if ((s = getenv("ProgramFiles(x86)")) != NULL) {
addenv(blk, "ProgramFiles(x86)=%s", s);
}
if ((s = getenv("CommonProgramFiles(x86)")) != NULL) {
addenv(blk, "CommonProgramFiles(x86)=%s", s);
}
#else
if ((s = getenv("LD_LIBRARY_PATH")) != NULL)
addenv(blk, "LD_LIBRARY_PATH=%s", s);
#endif // _WIN32
if ((s = getenv("PERLLIB")) != NULL)
addenv(blk, "PERLLIB=%s", s);
if (ri->remote_user != NULL) {
addenv(blk, "REMOTE_USER=%s", ri->remote_user);
addenv(blk, "%s", "AUTH_TYPE=Digest");
}
// Add all headers as HTTP_* variables
for (i = 0; i < ri->num_headers; i++) {
p = addenv(blk, "HTTP_%s=%s",
ri->http_headers[i].name, ri->http_headers[i].value);
// Convert variable name into uppercase, and change - to _
for (; *p != '=' && *p != '\0'; p++) {
if (*p == '-')
*p = '_';
*p = (char) toupper(* (unsigned char *) p);
}
}
// Add user-specified variables
s = conn->ctx->config[CGI_ENVIRONMENT];
while ((s = next_option(s, &var_vec, NULL)) != NULL) {
addenv(blk, "%.*s", (int) var_vec.len, var_vec.ptr);
}
blk->vars[blk->nvars++] = NULL;
blk->buf[blk->len++] = '\0';
assert(blk->nvars < (int) ARRAY_SIZE(blk->vars));
assert(blk->len > 0);
assert(blk->len < (int) sizeof(blk->buf));
}
static void handle_cgi_request(struct mg_connection *conn, const char *prog) {
int headers_len, data_len, i, fdin[2], fdout[2];
const char *status, *status_text;
char buf[16384], *pbuf, dir[PATH_MAX], *p;
struct mg_request_info ri;
struct cgi_env_block blk;
FILE *in = NULL, *out = NULL;
pid_t pid = (pid_t) -1;
prepare_cgi_environment(conn, prog, &blk);
// CGI must be executed in its own directory. 'dir' must point to the
// directory containing executable program, 'p' must point to the
// executable program name relative to 'dir'.
(void) mg_snprintf(dir, sizeof(dir), "%s", prog);
if ((p = strrchr(dir, '/')) != NULL) {
*p++ = '\0';
} else {
dir[0] = '.', dir[1] = '\0';
p = (char *) prog;
}
if (pipe(fdin) != 0 || pipe(fdout) != 0) {
send_http_error(conn, 500, http_500_error,
"Cannot create CGI pipe: %s", strerror(ERRNO));
goto done;
}
pid = spawn_process(conn, p, blk.buf, blk.vars, fdin[0], fdout[1], dir);
if (pid == (pid_t) -1) {
send_http_error(conn, 500, http_500_error,
"Cannot spawn CGI process [%s]: %s", prog, strerror(ERRNO));
goto done;
}
// Make sure child closes all pipe descriptors. It must dup them to 0,1
set_close_on_exec(fdin[0]);
set_close_on_exec(fdin[1]);
set_close_on_exec(fdout[0]);
set_close_on_exec(fdout[1]);
// Parent closes only one side of the pipes.
// If we don't mark them as closed, close() attempt before
// return from this function throws an exception on Windows.
// Windows does not like when closed descriptor is closed again.
(void) close(fdin[0]);
(void) close(fdout[1]);
fdin[0] = fdout[1] = -1;
if ((in = fdopen(fdin[1], "wb")) == NULL ||
(out = fdopen(fdout[0], "rb")) == NULL) {
send_http_error(conn, 500, http_500_error,
"fopen: %s", strerror(ERRNO));
goto done;
}
setbuf(in, NULL);
setbuf(out, NULL);
// Send POST data to the CGI process if needed
if (!strcmp(conn->request_info.request_method, "POST") &&
!forward_body_data(conn, in, INVALID_SOCKET, NULL)) {
goto done;
}
// Close so child gets an EOF.
fclose(in);
in = NULL;
fdin[1] = -1;
// Now read CGI reply into a buffer. We need to set correct
// status code, thus we need to see all HTTP headers first.
// Do not send anything back to client, until we buffer in all
// HTTP headers.
data_len = 0;
headers_len = read_request(out, conn, buf, sizeof(buf), &data_len);
if (headers_len <= 0) {
send_http_error(conn, 500, http_500_error,
"CGI program sent malformed or too big (>%u bytes) "
"HTTP headers: [%.*s]",
(unsigned) sizeof(buf), data_len, buf);
goto done;
}
pbuf = buf;
buf[headers_len - 1] = '\0';
parse_http_headers(&pbuf, &ri);
// Make up and send the status line
status_text = "OK";
if ((status = get_header(&ri, "Status")) != NULL) {
conn->status_code = atoi(status);
status_text = status;
while (isdigit(* (unsigned char *) status_text) || *status_text == ' ') {
status_text++;
}
} else if (get_header(&ri, "Location") != NULL) {
conn->status_code = 302;
} else {
conn->status_code = 200;
}
if (get_header(&ri, "Connection") != NULL &&
!mg_strcasecmp(get_header(&ri, "Connection"), "keep-alive")) {
conn->must_close = 1;
}
(void) mg_printf(conn, "HTTP/1.1 %d %s\r\n", conn->status_code,
status_text);
// Send headers
for (i = 0; i < ri.num_headers; i++) {
mg_printf(conn, "%s: %s\r\n",
ri.http_headers[i].name, ri.http_headers[i].value);
}
mg_write(conn, "\r\n", 2);
// Send chunk of data that may have been read after the headers
conn->num_bytes_sent += mg_write(conn, buf + headers_len,
(size_t)(data_len - headers_len));
// Read the rest of CGI output and send to the client
send_file_data(conn, out, 0, INT64_MAX);
done:
if (pid != (pid_t) -1) {
kill(pid, SIGKILL);
}
if (fdin[0] != -1) {
close(fdin[0]);
}
if (fdout[1] != -1) {
close(fdout[1]);
}
if (in != NULL) {
fclose(in);
} else if (fdin[1] != -1) {
close(fdin[1]);
}
if (out != NULL) {
fclose(out);
} else if (fdout[0] != -1) {
close(fdout[0]);
}
}
#endif // !NO_CGI
// For a given PUT path, create all intermediate subdirectories
// for given path. Return 0 if the path itself is a directory,
// or -1 on error, 1 if OK.
static int put_dir(const char *path) {
char buf[PATH_MAX];
const char *s, *p;
struct file file = STRUCT_FILE_INITIALIZER;
int len, res = 1;
for (s = p = path + 2; (p = strchr(s, '/')) != NULL; s = ++p) {
len = p - path;
if (len >= (int) sizeof(buf)) {
res = -1;
break;
}
memcpy(buf, path, len);
buf[len] = '\0';
// Try to create intermediate directory
DEBUG_TRACE(("mkdir(%s)", buf));
if (!mg_stat(buf, &file) && mg_mkdir(buf, 0755) != 0) {
res = -1;
break;
}
// Is path itself a directory?
if (p[1] == '\0') {
res = 0;
}
}
return res;
}
static void mkcol(struct mg_connection *conn, const char *path) {
int rc, body_len;
struct de de;
memset(&de.file, 0, sizeof(de.file));
mg_stat(path, &de.file);
if (de.file.modification_time) {
send_http_error(conn, 405, "Method Not Allowed",
"mkcol(%s): %s", path, strerror(ERRNO));
return;
}
body_len = conn->data_len - conn->request_len;
if(body_len > 0) {
send_http_error(conn, 415, "Unsupported media type",
"mkcol(%s): %s", path, strerror(ERRNO));
return;
}
rc = mg_mkdir(path, 0755);
if (rc == 0) {
conn->status_code = 201;
mg_printf(conn, "HTTP/1.1 %d Created\r\n\r\n", conn->status_code);
} else if (rc == -1) {
if(errno == EEXIST)
send_http_error(conn, 405, "Method Not Allowed",
"mkcol(%s): %s", path, strerror(ERRNO));
else if(errno == EACCES)
send_http_error(conn, 403, "Forbidden",
"mkcol(%s): %s", path, strerror(ERRNO));
else if(errno == ENOENT)
send_http_error(conn, 409, "Conflict",
"mkcol(%s): %s", path, strerror(ERRNO));
else
send_http_error(conn, 500, http_500_error,
"fopen(%s): %s", path, strerror(ERRNO));
}
}
static void put_file(struct mg_connection *conn, const char *path) {
struct file file = STRUCT_FILE_INITIALIZER;
FILE *fp;
const char *range;
int64_t r1, r2;
int rc;
conn->status_code = mg_stat(path, &file) ? 200 : 201;
if ((rc = put_dir(path)) == 0) {
mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->status_code);
} else if (rc == -1) {
send_http_error(conn, 500, http_500_error,
"put_dir(%s): %s", path, strerror(ERRNO));
} else if ((fp = mg_fopen(path, "wb+")) == NULL) {
fclose(fp);
send_http_error(conn, 500, http_500_error,
"fopen(%s): %s", path, strerror(ERRNO));
} else {
fclose_on_exec(fp);
range = mg_get_header(conn, "Content-Range");
r1 = r2 = 0;
if (range != NULL && parse_range_header(range, &r1, &r2) > 0) {
conn->status_code = 206;
fseeko(fp, r1, SEEK_SET);
}
if (!forward_body_data(conn, fp, INVALID_SOCKET, NULL)) {
conn->status_code = 500;
}
mg_printf(conn, "HTTP/1.1 %d OK\r\nContent-Length: 0\r\n\r\n",
conn->status_code);
fclose(fp);
}
}
static void send_ssi_file(struct mg_connection *, const char *, FILE *, int);
static void do_ssi_include(struct mg_connection *conn, const char *ssi,
char *tag, int include_level) {
char file_name[MG_BUF_LEN], path[PATH_MAX], *p;
FILE *fp;
// sscanf() is safe here, since send_ssi_file() also uses buffer
// of size MG_BUF_LEN to get the tag. So strlen(tag) is always < MG_BUF_LEN.
if (sscanf(tag, " virtual=\"%[^\"]\"", file_name) == 1) {
// File name is relative to the webserver root
(void) mg_snprintf(path, sizeof(path), "%s%c%s",
conn->ctx->config[DOCUMENT_ROOT], '/', file_name);
} else if (sscanf(tag, " abspath=\"%[^\"]\"", file_name) == 1) {
// File name is relative to the webserver working directory
// or it is absolute system path
(void) mg_snprintf(path, sizeof(path), "%s", file_name);
} else if (sscanf(tag, " file=\"%[^\"]\"", file_name) == 1 ||
sscanf(tag, " \"%[^\"]\"", file_name) == 1) {
// File name is relative to the currect document
(void) mg_snprintf(path, sizeof(path), "%s", ssi);
if ((p = strrchr(path, '/')) != NULL) {
p[1] = '\0';
}
(void) mg_snprintf(path + strlen(path),
sizeof(path) - strlen(path), "%s", file_name);
} else {
cry(conn, "Bad SSI #include: [%s]", tag);
return;
}
if ((fp = mg_fopen(path, "rb")) == NULL) {
cry(conn, "Cannot open SSI #include: [%s]: fopen(%s): %s",
tag, path, strerror(ERRNO));
} else {
fclose_on_exec(fp);
if (match_prefix(conn->ctx->config[SSI_EXTENSIONS],
strlen(conn->ctx->config[SSI_EXTENSIONS]), path) > 0) {
send_ssi_file(conn, path, fp, include_level + 1);
} else {
send_file_data(conn, fp, 0, INT64_MAX);
}
fclose(fp);
}
}
#if !defined(NO_POPEN)
static void do_ssi_exec(struct mg_connection *conn, char *tag) {
char cmd[MG_BUF_LEN];
FILE *fp;
if (sscanf(tag, " \"%[^\"]\"", cmd) != 1) {
cry(conn, "Bad SSI #exec: [%s]", tag);
} else if ((fp = popen(cmd, "r")) == NULL) {
cry(conn, "Cannot SSI #exec: [%s]: %s", cmd, strerror(ERRNO));
} else {
send_file_data(conn, fp, 0, INT64_MAX);
pclose(fp);
}
}
#endif // !NO_POPEN
static void send_ssi_file(struct mg_connection *conn, const char *path,
FILE *fp, int include_level) {
char buf[MG_BUF_LEN];
int ch, offset, len, in_ssi_tag;
if (include_level > 10) {
cry(conn, "SSI #include level is too deep (%s)", path);
return;
}
in_ssi_tag = len = offset = 0;
while ((ch = fgetc(fp)) != EOF) {
if (in_ssi_tag && ch == '>') {
in_ssi_tag = 0;
buf[len++] = (char) ch;
buf[len] = '\0';
assert(len <= (int) sizeof(buf));
if (len < 6 || memcmp(buf, "|<--data_len-->|
// |<-conn->request_len->|<-----body_len----------->|
// |<-------------------conn->data_len------------->|
if (header_len > 0) {
// Allocate space to hold websocket payload
if ((*data = malloc(data_len)) == NULL) {
// Allocation failed, exit the loop and then close the connection
// TODO: notify user about the failure
data_len = 0;
break;
}
// Save mask and bits, otherwise it may be clobbered by memmove below
*bits = buf[0];
memcpy(mask, buf + header_len - mask_len, mask_len);
// Read frame payload into the allocated buffer.
assert(body_len >= header_len);
if (data_len + header_len > body_len) {
len = body_len - header_len;
memcpy(*data, buf + header_len, len);
// TODO: handle pull error
pull_all(NULL, conn, *data + len, data_len - len);
conn->data_len = conn->request_len;
} else {
len = data_len + header_len;
memcpy(*data, buf + header_len, data_len);
memmove(buf, buf + len, body_len - len);
conn->data_len -= len;
}
// Apply mask if necessary
if (mask_len > 0) {
for (i = 0; i < data_len; i++) {
(*data)[i] ^= mask[i % 4];
}
}
return data_len;
} else {
// Buffering websocket request
if ((n = pull(NULL, conn, conn->buf + conn->data_len,
conn->buf_size - conn->data_len)) <= 0) {
break;
}
conn->data_len += n;
}
}
return 0;
}
int mg_websocket_write(struct mg_connection* conn, int opcode,
const char *data, size_t data_len) {
unsigned char *copy;
size_t copy_len = 0;
int retval = -1;
if ((copy = (unsigned char *) malloc(data_len + 10)) == NULL) {
return -1;
}
copy[0] = 0x80 + (opcode & 0x0f);
// Frame format: http://tools.ietf.org/html/rfc6455#section-5.2
if (data_len < 126) {
// Inline 7-bit length field
copy[1] = data_len;
memcpy(copy + 2, data, data_len);
copy_len = 2 + data_len;
} else if (data_len <= 0xFFFF) {
// 16-bit length field
copy[1] = 126;
* (uint16_t *) (copy + 2) = htons(data_len);
memcpy(copy + 4, data, data_len);
copy_len = 4 + data_len;
} else {
// 64-bit length field
copy[1] = 127;
* (uint32_t *) (copy + 2) = htonl((uint64_t) data_len >> 32);
* (uint32_t *) (copy + 6) = htonl(data_len & 0xffffffff);
memcpy(copy + 10, data, data_len);
copy_len = 10 + data_len;
}
// Not thread safe
if (copy_len > 0) {
retval = mg_write(conn, copy, copy_len);
}
free(copy);
return retval;
}
#endif // !USE_WEBSOCKET
static int isbyte(int n) {
return n >= 0 && n <= 255;
}
static int parse_net(const char *spec, uint32_t *net, uint32_t *mask) {
int n, a, b, c, d, slash = 32, len = 0;
if ((sscanf(spec, "%d.%d.%d.%d/%d%n", &a, &b, &c, &d, &slash, &n) == 5 ||
sscanf(spec, "%d.%d.%d.%d%n", &a, &b, &c, &d, &n) == 4) &&
isbyte(a) && isbyte(b) && isbyte(c) && isbyte(d) &&
slash >= 0 && slash < 33) {
len = n;
*net = ((uint32_t)a << 24) | ((uint32_t)b << 16) | ((uint32_t)c << 8) | d;
*mask = slash ? 0xffffffffU << (32 - slash) : 0;
}
return len;
}
static int set_throttle(const char *spec, uint32_t remote_ip, const char *uri) {
int throttle = 0;
struct vec vec, val;
uint32_t net, mask;
char mult;
double v;
while ((spec = next_option(spec, &vec, &val)) != NULL) {
mult = ',';
if (sscanf(val.ptr, "%lf%c", &v, &mult) < 1 || v < 0 ||
(lowercase(&mult) != 'k' && lowercase(&mult) != 'm' && mult != ',')) {
continue;
}
v *= lowercase(&mult) == 'k' ? 1024 : lowercase(&mult) == 'm' ? 1048576 : 1;
if (vec.len == 1 && vec.ptr[0] == '*') {
throttle = (int) v;
} else if (parse_net(vec.ptr, &net, &mask) > 0) {
if ((remote_ip & mask) == net) {
throttle = (int) v;
}
} else if (match_prefix(vec.ptr, vec.len, uri) > 0) {
throttle = (int) v;
}
}
return throttle;
}
static uint32_t get_remote_ip(const struct mg_connection *conn) {
return ntohl(* (uint32_t *) &conn->client.rsa.sin.sin_addr);
}
FILE *mg_upload(struct mg_connection *conn, const char *destination_dir,
char *path, int path_len) {
const char *content_type_header, *boundary_start;
char *buf, fname[1024], boundary[100], *s;
int bl, n, i, j, headers_len, boundary_len, eof, buf_len, to_read, len = 0;
FILE *fp;
// Request looks like this:
//
// POST /upload HTTP/1.1
// Host: 127.0.0.1:8080
// Content-Length: 244894
// Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryRVr
//
// ------WebKitFormBoundaryRVr
// Content-Disposition: form-data; name="file"; filename="accum.png"
// Content-Type: image/png
//
// <89>PNG
//
// ------WebKitFormBoundaryRVr
// Extract boundary string from the Content-Type header
if ((content_type_header = mg_get_header(conn, "Content-Type")) == NULL ||
(boundary_start = mg_strcasestr(content_type_header,
"boundary=")) == NULL ||
(sscanf(boundary_start, "boundary=\"%99[^\"]\"", boundary) == 0 &&
sscanf(boundary_start, "boundary=%99s", boundary) == 0) ||
boundary[0] == '\0') {
return NULL;
}
boundary_len = strlen(boundary);
bl = boundary_len + 4; // \r\n--
// buf
// conn->buf |<--------- buf_len ------>|
// |=================|==========|===============|
// |<--request_len-->|<--len--->| |
// |<-----------data_len------->| conn->buf + conn->buf_size
buf = conn->buf + conn->request_len;
buf_len = conn->buf_size - conn->request_len;
len = conn->data_len - conn->request_len;
for (;;) {
// Pull in headers
assert(len >= 0 && len <= buf_len);
to_read = buf_len - len;
if (to_read > left_to_read(conn)) {
to_read = (int) left_to_read(conn);
}
while (len < buf_len &&
(n = pull(NULL, conn, buf + len, to_read)) > 0) {
len += n;
}
if ((headers_len = get_request_len(buf, len)) <= 0) {
break;
}
// Fetch file name.
fname[0] = '\0';
for (i = j = 0; i < headers_len; i++) {
if (buf[i] == '\r' && buf[i + 1] == '\n') {
buf[i] = buf[i + 1] = '\0';
// TODO(lsm): don't expect filename to be the 3rd field,
// parse the header properly instead.
sscanf(&buf[j], "Content-Disposition: %*s %*s filename=\"%1023[^\"]",
fname);
j = i + 2;
}
}
// Give up if the headers are not what we expect
if (fname[0] == '\0') {
break;
}
// Move data to the beginning of the buffer
assert(len >= headers_len);
memmove(buf, &buf[headers_len], len - headers_len);
len -= headers_len;
conn->data_len = conn->request_len + len;
// We open the file with exclusive lock held. This guarantee us
// there is no other thread can save into the same file simultaneously.
fp = NULL;
// Construct destination file name. Do not allow paths to have slashes.
if ((s = strrchr(fname, '/')) == NULL &&
(s = strrchr(fname, '\\')) == NULL) {
s = fname;
}
// Open file in binary mode. TODO: set an exclusive lock.
snprintf(path, path_len, "%s/%s", destination_dir, s);
if ((fp = fopen(path, "wb")) == NULL) {
break;
}
// Read POST data, write into file until boundary is found.
eof = n = 0;
do {
len += n;
for (i = 0; i < len - bl; i++) {
if (!memcmp(&buf[i], "\r\n--", 4) &&
!memcmp(&buf[i + 4], boundary, boundary_len)) {
// Found boundary, that's the end of file data.
fwrite(buf, 1, i, fp);
eof = 1;
memmove(buf, &buf[i + bl], len - (i + bl));
len -= i + bl;
break;
}
}
if (!eof && len > bl) {
fwrite(buf, 1, len - bl, fp);
memmove(buf, &buf[len - bl], bl);
len = bl;
}
to_read = buf_len - len;
if (to_read > left_to_read(conn)) {
to_read = (int) left_to_read(conn);
}
} while (!eof && (n = pull(NULL, conn, buf + len, to_read)) > 0);
conn->data_len = conn->request_len + len;
if (eof) {
rewind(fp);
return fp;
} else {
fclose(fp);
}
}
return NULL;
}
static int is_put_or_delete_request(const struct mg_connection *conn) {
const char *s = conn->request_info.request_method;
return s != NULL && (!strcmp(s, "PUT") ||
!strcmp(s, "DELETE") ||
!strcmp(s, "MKCOL"));
}
static int get_first_ssl_listener_index(const struct mg_context *ctx) {
int i, index = -1;
for (i = 0; index == -1 && i < ctx->num_listening_sockets; i++) {
index = ctx->listening_sockets[i].is_ssl ? i : -1;
}
return index;
}
static void redirect_to_https_port(struct mg_connection *conn, int ssl_index) {
char host[1025];
const char *host_header;
if ((host_header = mg_get_header(conn, "Host")) == NULL ||
sscanf(host_header, "%1024[^:]", host) == 0) {
// Cannot get host from the Host: header. Fallback to our IP address.
sockaddr_to_string(host, sizeof(host), &conn->client.lsa);
}
mg_printf(conn, "HTTP/1.1 302 Found\r\nLocation: https://%s:%d%s\r\n\r\n",
host, (int) ntohs(conn->ctx->listening_sockets[ssl_index].
lsa.sin.sin_port), conn->request_info.uri);
}
static void handle_delete_request(struct mg_connection *conn,
const char *path) {
struct file file = STRUCT_FILE_INITIALIZER;
if (!mg_stat(path, &file)) {
send_http_error(conn, 404, "Not Found", "%s", "File not found");
} else if (!file.modification_time) {
send_http_error(conn, 500, http_500_error, "remove(%s): %s", path,
strerror(ERRNO));
} else if (file.is_directory) {
remove_directory(conn, path);
send_http_error(conn, 204, "No Content", "%s", "");
} else if (mg_remove(path) == 0) {
send_http_error(conn, 204, "No Content", "%s", "");
} else {
send_http_error(conn, 423, "Locked", "remove(%s): %s", path,
strerror(ERRNO));
}
}
// This is the heart of the Mongoose's logic.
// This function is called when the request is read, parsed and validated,
// and Mongoose must decide what action to take: serve a file, or
// a directory, or call embedded function, etcetera.
static void handle_request(struct mg_connection *conn) {
struct mg_request_info *ri = &conn->request_info;
char path[PATH_MAX];
int uri_len, ssl_index;
struct file file = STRUCT_FILE_INITIALIZER;
if ((conn->request_info.query_string = strchr(ri->uri, '?')) != NULL) {
* ((char *) conn->request_info.query_string++) = '\0';
}
uri_len = (int) strlen(ri->uri);
mg_url_decode(ri->uri, uri_len, (char *) ri->uri, uri_len + 1, 0);
remove_double_dots_and_double_slashes((char *) ri->uri);
conn->throttle = set_throttle(conn->ctx->config[THROTTLE],
get_remote_ip(conn), ri->uri);
path[0] = '\0';
convert_uri_to_file_name(conn, path, sizeof(path), &file);
// Perform redirect and auth checks before calling begin_request() handler.
// Otherwise, begin_request() would need to perform auth checks and redirects.
if (!conn->client.is_ssl && conn->client.ssl_redir &&
(ssl_index = get_first_ssl_listener_index(conn->ctx)) > -1) {
redirect_to_https_port(conn, ssl_index);
} else if (!is_put_or_delete_request(conn) &&
!check_authorization(conn, path)) {
send_authorization_request(conn);
} else if (call_user(MG_REQUEST_BEGIN, conn, (void *) ri->uri) == 1) {
// Do nothing, callback has served the request
} else if (!strcmp(ri->request_method, "OPTIONS")) {
handle_options_request(conn);
} else if (conn->ctx->config[DOCUMENT_ROOT] == NULL) {
send_http_error(conn, 404, "Not Found", "Not Found");
} else if (is_put_or_delete_request(conn) &&
(is_authorized_for_put(conn) != 1)) {
send_authorization_request(conn);
} else if (!strcmp(ri->request_method, "PUT")) {
put_file(conn, path);
} else if (!strcmp(ri->request_method, "MKCOL")) {
mkcol(conn, path);
} else if (!strcmp(ri->request_method, "DELETE")) {
handle_delete_request(conn, path);
} else if (file.modification_time == (time_t) 0 ||
must_hide_file(conn, path)) {
send_http_error(conn, 404, "Not Found", "%s", "File not found");
} else if (file.is_directory && ri->uri[uri_len - 1] != '/') {
mg_printf(conn, "HTTP/1.1 301 Moved Permanently\r\n"
"Location: %s/\r\n\r\n", ri->uri);
} else if (!strcmp(ri->request_method, "PROPFIND")) {
handle_propfind(conn, path, &file);
} else if (file.is_directory &&
!substitute_index_file(conn, path, sizeof(path), &file)) {
if (!mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes")) {
handle_directory_request(conn, path);
} else {
send_http_error(conn, 403, "Directory Listing Denied",
"Directory listing denied");
}
#ifdef USE_LUA
} else if (match_prefix("**.lp$", 6, path) > 0) {
handle_lsp_request(conn, path, &file, NULL);
#endif
#if !defined(NO_CGI)
} else if (match_prefix(conn->ctx->config[CGI_EXTENSIONS],
strlen(conn->ctx->config[CGI_EXTENSIONS]),
path) > 0) {
if (strcmp(ri->request_method, "POST") &&
strcmp(ri->request_method, "HEAD") &&
strcmp(ri->request_method, "GET")) {
send_http_error(conn, 501, "Not Implemented",
"Method %s is not implemented", ri->request_method);
} else {
handle_cgi_request(conn, path);
}
#endif // !NO_CGI
} else if (match_prefix(conn->ctx->config[SSI_EXTENSIONS],
strlen(conn->ctx->config[SSI_EXTENSIONS]),
path) > 0) {
handle_ssi_file_request(conn, path);
} else if (is_not_modified(conn, &file)) {
send_http_error(conn, 304, "Not Modified", "%s", "");
} else {
handle_file_request(conn, path, &file);
}
}
static void close_all_listening_sockets(struct mg_context *ctx) {
int i;
for (i = 0; i < ctx->num_listening_sockets; i++) {
closesocket(ctx->listening_sockets[i].sock);
}
free(ctx->listening_sockets);
}
static int is_valid_port(unsigned int port) {
return port > 0 && port < 0xffff;
}
// Valid listening port specification is: [ip_address:]port[s]
// Examples: 80, 443s, 127.0.0.1:3128, 1.2.3.4:8080s
// TODO(lsm): add parsing of the IPv6 address
static int parse_port_string(const struct vec *vec, struct socket *so) {
unsigned int a, b, c, d, ch, port;
int len;
#if defined(USE_IPV6)
char buf[100];
#endif
// MacOS needs that. If we do not zero it, subsequent bind() will fail.
// Also, all-zeroes in the socket address means binding to all addresses
// for both IPv4 and IPv6 (INADDR_ANY and IN6ADDR_ANY_INIT).
memset(so, 0, sizeof(*so));
so->lsa.sin.sin_family = AF_INET;
if (sscanf(vec->ptr, "%u.%u.%u.%u:%u%n", &a, &b, &c, &d, &port, &len) == 5) {
// Bind to a specific IPv4 address, e.g. 192.168.1.5:8080
so->lsa.sin.sin_addr.s_addr = htonl((a << 24) | (b << 16) | (c << 8) | d);
so->lsa.sin.sin_port = htons((uint16_t) port);
#if defined(USE_IPV6)
} else if (sscanf(vec->ptr, "[%49[^]]]:%d%n", buf, &port, &len) == 2 &&
inet_pton(AF_INET6, buf, &so->lsa.sin6.sin6_addr)) {
// IPv6 address, e.g. [3ffe:2a00:100:7031::1]:8080
so->lsa.sin6.sin6_family = AF_INET6;
so->lsa.sin6.sin6_port = htons((uint16_t) port);
#endif
} else if (sscanf(vec->ptr, "%u%n", &port, &len) == 1) {
// If only port is specified, bind to IPv4, INADDR_ANY
so->lsa.sin.sin_port = htons((uint16_t) port);
} else {
port = len = 0; // Parsing failure. Make port invalid.
}
ch = vec->ptr[len]; // Next character after the port number
so->is_ssl = ch == 's';
so->ssl_redir = ch == 'r';
// Make sure the port is valid and vector ends with 's', 'r' or ','
return is_valid_port(port) &&
(ch == '\0' || ch == 's' || ch == 'r' || ch == ',');
}
static int set_ports_option(struct mg_context *ctx) {
const char *list = ctx->config[LISTENING_PORTS];
int on = 1, success = 1;
#if defined(USE_IPV6)
int off = 0;
#endif
struct vec vec;
struct socket so, *ptr;
while (success && (list = next_option(list, &vec, NULL)) != NULL) {
if (!parse_port_string(&vec, &so)) {
cry(fc(ctx), "%s: %.*s: invalid port spec. Expecting list of: %s",
__func__, (int) vec.len, vec.ptr, "[IP_ADDRESS:]PORT[s|r]");
success = 0;
} else if (so.is_ssl && ctx->ssl_ctx == NULL) {
cry(fc(ctx), "Cannot add SSL socket, is -ssl_certificate option set?");
success = 0;
} else if ((so.sock = socket(so.lsa.sa.sa_family, SOCK_STREAM, 6)) ==
INVALID_SOCKET ||
// On Windows, SO_REUSEADDR is recommended only for
// broadcast UDP sockets
setsockopt(so.sock, SOL_SOCKET, SO_REUSEADDR,
(void *) &on, sizeof(on)) != 0 ||
#if defined(USE_IPV6)
(so.lsa.sa.sa_family == AF_INET6 &&
setsockopt(so.sock, IPPROTO_IPV6, IPV6_V6ONLY, (void *) &off,
sizeof(off)) != 0) ||
#endif
bind(so.sock, &so.lsa.sa, so.lsa.sa.sa_family == AF_INET ?
sizeof(so.lsa.sin) : sizeof(so.lsa)) != 0 ||
listen(so.sock, SOMAXCONN) != 0) {
cry(fc(ctx), "%s: cannot bind to %.*s: %d (%s)", __func__,
(int) vec.len, vec.ptr, ERRNO, strerror(errno));
closesocket(so.sock);
success = 0;
} else if ((ptr = (struct socket *) realloc(ctx->listening_sockets,
(ctx->num_listening_sockets + 1) *
sizeof(ctx->listening_sockets[0]))) == NULL) {
closesocket(so.sock);
success = 0;
} else {
set_close_on_exec(so.sock);
ctx->listening_sockets = ptr;
ctx->listening_sockets[ctx->num_listening_sockets] = so;
ctx->num_listening_sockets++;
}
}
if (!success) {
close_all_listening_sockets(ctx);
}
return success;
}
static void log_header(const struct mg_connection *conn, const char *header,
FILE *fp) {
const char *header_value;
if ((header_value = mg_get_header(conn, header)) == NULL) {
(void) fprintf(fp, "%s", " -");
} else {
(void) fprintf(fp, " \"%s\"", header_value);
}
}
static void log_access(const struct mg_connection *conn) {
const struct mg_request_info *ri;
FILE *fp;
char date[64], src_addr[IP_ADDR_STR_LEN];
fp = conn->ctx->config[ACCESS_LOG_FILE] == NULL ? NULL :
fopen(conn->ctx->config[ACCESS_LOG_FILE], "a+");
if (fp == NULL)
return;
strftime(date, sizeof(date), "%d/%b/%Y:%H:%M:%S %z",
localtime(&conn->birth_time));
ri = &conn->request_info;
flockfile(fp);
sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
fprintf(fp, "%s - %s [%s] \"%s %s HTTP/%s\" %d %" INT64_FMT,
src_addr, ri->remote_user == NULL ? "-" : ri->remote_user, date,
ri->request_method ? ri->request_method : "-",
ri->uri ? ri->uri : "-", ri->http_version,
conn->status_code, conn->num_bytes_sent);
log_header(conn, "Referer", fp);
log_header(conn, "User-Agent", fp);
fputc('\n', fp);
fflush(fp);
funlockfile(fp);
fclose(fp);
}
// Verify given socket address against the ACL.
// Return -1 if ACL is malformed, 0 if address is disallowed, 1 if allowed.
static int check_acl(struct mg_context *ctx, uint32_t remote_ip) {
int allowed, flag;
uint32_t net, mask;
struct vec vec;
const char *list = ctx->config[ACCESS_CONTROL_LIST];
// If any ACL is set, deny by default
allowed = list == NULL ? '+' : '-';
while ((list = next_option(list, &vec, NULL)) != NULL) {
flag = vec.ptr[0];
if ((flag != '+' && flag != '-') ||
parse_net(&vec.ptr[1], &net, &mask) == 0) {
cry(fc(ctx), "%s: subnet must be [+|-]x.x.x.x[/x]", __func__);
return -1;
}
if (net == (remote_ip & mask)) {
allowed = flag;
}
}
return allowed == '+';
}
#if !defined(_WIN32)
static int set_uid_option(struct mg_context *ctx) {
struct passwd *pw;
const char *uid = ctx->config[RUN_AS_USER];
int success = 0;
if (uid == NULL) {
success = 1;
} else {
if ((pw = getpwnam(uid)) == NULL) {
cry(fc(ctx), "%s: unknown user [%s]", __func__, uid);
} else if (setgid(pw->pw_gid) == -1) {
cry(fc(ctx), "%s: setgid(%s): %s", __func__, uid, strerror(errno));
} else if (setuid(pw->pw_uid) == -1) {
cry(fc(ctx), "%s: setuid(%s): %s", __func__, uid, strerror(errno));
} else {
success = 1;
}
}
return success;
}
#endif // !_WIN32
static int set_gpass_option(struct mg_context *ctx) {
struct file file = STRUCT_FILE_INITIALIZER;
const char *path = ctx->config[GLOBAL_PASSWORDS_FILE];
if (path != NULL && !mg_stat(path, &file)) {
cry(fc(ctx), "Cannot open %s: %s", path, strerror(ERRNO));
return 0;
}
return 1;
}
static int set_acl_option(struct mg_context *ctx) {
return check_acl(ctx, (uint32_t) 0x7f000001UL) != -1;
}
static void reset_per_request_attributes(struct mg_connection *conn) {
conn->path_info = NULL;
conn->num_bytes_sent = conn->num_bytes_read = 0;
conn->status_code = -1;
conn->must_close = conn->request_len = conn->throttle = 0;
}
static void close_socket_gracefully(struct mg_connection *conn) {
#if defined(_WIN32)
char buf[MG_BUF_LEN];
int n;
#endif
struct linger linger;
// Set linger option to avoid socket hanging out after close. This prevent
// ephemeral port exhaust problem under high QPS.
linger.l_onoff = 1;
linger.l_linger = 1;
setsockopt(conn->client.sock, SOL_SOCKET, SO_LINGER,
(char *) &linger, sizeof(linger));
// Send FIN to the client
shutdown(conn->client.sock, SHUT_WR);
set_non_blocking_mode(conn->client.sock);
#if defined(_WIN32)
// Read and discard pending incoming data. If we do not do that and close the
// socket, the data in the send buffer may be discarded. This
// behaviour is seen on Windows, when client keeps sending data
// when server decides to close the connection; then when client
// does recv() it gets no data back.
do {
n = pull(NULL, conn, buf, sizeof(buf));
} while (n > 0);
#endif
// Now we know that our FIN is ACK-ed, safe to close
closesocket(conn->client.sock);
}
static void close_connection(struct mg_connection *conn) {
conn->must_close = 1;
#ifndef NO_SSL
if (conn->ssl != NULL) {
// Run SSL_shutdown twice to ensure completly close SSL connection
SSL_shutdown(conn->ssl);
SSL_free(conn->ssl);
conn->ssl = NULL;
}
#endif
if (conn->client.sock != INVALID_SOCKET) {
close_socket_gracefully(conn);
conn->client.sock = INVALID_SOCKET;
}
}
void mg_close_connection(struct mg_connection *conn) {
#ifndef NO_SSL
if (conn->client_ssl_ctx != NULL) {
SSL_CTX_free((SSL_CTX *) conn->client_ssl_ctx);
}
#endif
close_connection(conn);
free(conn);
}
static int is_valid_uri(const char *uri) {
// Conform to http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html#sec5.1.2
// URI can be an asterisk (*) or should start with slash.
return uri[0] == '/' || (uri[0] == '*' && uri[1] == '\0');
}
static int getreq(struct mg_connection *conn, char *ebuf, size_t ebuf_len) {
const char *cl;
ebuf[0] = '\0';
reset_per_request_attributes(conn);
conn->request_len = read_request(NULL, conn, conn->buf, conn->buf_size,
&conn->data_len);
assert(conn->request_len < 0 || conn->data_len >= conn->request_len);
if (conn->request_len == 0 && conn->data_len == conn->buf_size) {
snprintf(ebuf, ebuf_len, "%s", "Request Too Large");
} else if (conn->request_len <= 0) {
snprintf(ebuf, ebuf_len, "%s", "Client closed connection");
} else if (parse_http_message(conn->buf, conn->buf_size,
&conn->request_info) <= 0) {
snprintf(ebuf, ebuf_len, "Bad request: [%.*s]", conn->data_len, conn->buf);
} else {
// Request is valid. Set content_len attribute by parsing Content-Length
// If Content-Length is absent, set content_len to 0 if request is GET,
// and set it to INT64_MAX otherwise. Setting to INT64_MAX instructs
// mg_read() to read from the socket until socket is closed.
// The reason for treating GET and POST/PUT differently is that libraries
// like jquery do not set Content-Length in GET requests, and we don't
// want mg_read() to hang waiting until socket is timed out.
// See https://github.com/cesanta/mongoose/pull/121 for more.
conn->content_len = INT64_MAX;
if (!mg_strcasecmp(conn->request_info.request_method, "GET")) {
conn->content_len = 0;
}
if ((cl = get_header(&conn->request_info, "Content-Length")) != NULL) {
conn->content_len = strtoll(cl, NULL, 10);
}
conn->birth_time = time(NULL);
}
return ebuf[0] == '\0';
}
static void process_new_connection(struct mg_connection *conn) {
struct mg_request_info *ri = &conn->request_info;
int keep_alive_enabled, keep_alive, discard_len;
char ebuf[100];
keep_alive_enabled = !strcmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes");
keep_alive = 0;
// Important: on new connection, reset the receiving buffer. Credit goes
// to crule42.
conn->data_len = 0;
do {
if (!getreq(conn, ebuf, sizeof(ebuf))) {
send_http_error(conn, 500, "Server Error", "%s", ebuf);
conn->must_close = 1;
} else if (!is_valid_uri(conn->request_info.uri)) {
snprintf(ebuf, sizeof(ebuf), "Invalid URI: [%s]", ri->uri);
send_http_error(conn, 400, "Bad Request", "%s", ebuf);
} else if (strcmp(ri->http_version, "1.0") &&
strcmp(ri->http_version, "1.1")) {
snprintf(ebuf, sizeof(ebuf), "Bad HTTP version: [%s]", ri->http_version);
send_http_error(conn, 505, "Bad HTTP version", "%s", ebuf);
}
if (ebuf[0] == '\0') {
handle_request(conn);
call_user(MG_REQUEST_END, conn, (void *) conn->status_code);
log_access(conn);
}
if (ri->remote_user != NULL) {
free((void *) ri->remote_user);
// Important! When having connections with and without auth
// would cause double free and then crash
ri->remote_user = NULL;
}
// NOTE(lsm): order is important here. should_keep_alive() call
// is using parsed request, which will be invalid after memmove's below.
// Therefore, memorize should_keep_alive() result now for later use
// in loop exit condition.
keep_alive = conn->ctx->stop_flag == 0 && keep_alive_enabled &&
conn->content_len >= 0 && should_keep_alive(conn);
// Discard all buffered data for this request
discard_len = conn->content_len >= 0 && conn->request_len > 0 &&
conn->request_len + conn->content_len < (int64_t) conn->data_len ?
(int) (conn->request_len + conn->content_len) : conn->data_len;
assert(discard_len >= 0);
memmove(conn->buf, conn->buf + discard_len, conn->data_len - discard_len);
conn->data_len -= discard_len;
assert(conn->data_len >= 0);
assert(conn->data_len <= conn->buf_size);
} while (keep_alive);
}
// Worker threads take accepted socket from the queue
static int consume_socket(struct mg_context *ctx, struct socket *sp) {
(void) pthread_mutex_lock(&ctx->mutex);
DEBUG_TRACE(("going idle"));
// If the queue is empty, wait. We're idle at this point.
while (ctx->sq_head == ctx->sq_tail && ctx->stop_flag == 0) {
pthread_cond_wait(&ctx->sq_full, &ctx->mutex);
}
// If we're stopping, sq_head may be equal to sq_tail.
if (ctx->sq_head > ctx->sq_tail) {
// Copy socket from the queue and increment tail
*sp = ctx->queue[ctx->sq_tail % ARRAY_SIZE(ctx->queue)];
ctx->sq_tail++;
DEBUG_TRACE(("grabbed socket %d, going busy", sp->sock));
// Wrap pointers if needed
while (ctx->sq_tail > (int) ARRAY_SIZE(ctx->queue)) {
ctx->sq_tail -= ARRAY_SIZE(ctx->queue);
ctx->sq_head -= ARRAY_SIZE(ctx->queue);
}
}
(void) pthread_cond_signal(&ctx->sq_empty);
(void) pthread_mutex_unlock(&ctx->mutex);
return !ctx->stop_flag;
}
static void *worker_thread(void *thread_func_param) {
struct mg_context *ctx = (struct mg_context *) thread_func_param;
struct mg_connection *conn;
conn = (struct mg_connection *) calloc(1, sizeof(*conn) + MAX_REQUEST_SIZE);
if (conn == NULL) {
cry(fc(ctx), "%s", "Cannot create new connection struct, OOM");
} else {
conn->buf_size = MAX_REQUEST_SIZE;
conn->buf = (char *) (conn + 1);
conn->ctx = ctx;
conn->event.user_data = ctx->user_data;
call_user(MG_THREAD_BEGIN, conn, NULL);
// Call consume_socket() even when ctx->stop_flag > 0, to let it signal
// sq_empty condvar to wake up the master waiting in produce_socket()
while (consume_socket(ctx, &conn->client)) {
conn->birth_time = time(NULL);
// Fill in IP, port info early so even if SSL setup below fails,
// error handler would have the corresponding info.
// Thanks to Johannes Winkelmann for the patch.
// TODO(lsm): Fix IPv6 case
conn->request_info.remote_port = ntohs(conn->client.rsa.sin.sin_port);
memcpy(&conn->request_info.remote_ip,
&conn->client.rsa.sin.sin_addr.s_addr, 4);
conn->request_info.remote_ip = ntohl(conn->request_info.remote_ip);
conn->request_info.is_ssl = conn->client.is_ssl;
if (!conn->client.is_ssl
#ifndef NO_SSL
|| sslize(conn, conn->ctx->ssl_ctx, SSL_accept)
#endif
) {
process_new_connection(conn);
}
close_connection(conn);
}
call_user(MG_THREAD_END, conn, NULL);
free(conn);
}
// Signal master that we're done with connection and exiting
(void) pthread_mutex_lock(&ctx->mutex);
ctx->num_threads--;
(void) pthread_cond_signal(&ctx->cond);
assert(ctx->num_threads >= 0);
(void) pthread_mutex_unlock(&ctx->mutex);
DEBUG_TRACE(("exiting"));
return NULL;
}
// Master thread adds accepted socket to a queue
static void produce_socket(struct mg_context *ctx, const struct socket *sp) {
(void) pthread_mutex_lock(&ctx->mutex);
// If the queue is full, wait
while (ctx->stop_flag == 0 &&
ctx->sq_head - ctx->sq_tail >= (int) ARRAY_SIZE(ctx->queue)) {
(void) pthread_cond_wait(&ctx->sq_empty, &ctx->mutex);
}
if (ctx->sq_head - ctx->sq_tail < (int) ARRAY_SIZE(ctx->queue)) {
// Copy socket to the queue and increment head
ctx->queue[ctx->sq_head % ARRAY_SIZE(ctx->queue)] = *sp;
ctx->sq_head++;
DEBUG_TRACE(("queued socket %d", sp->sock));
}
(void) pthread_cond_signal(&ctx->sq_full);
(void) pthread_mutex_unlock(&ctx->mutex);
}
static int set_sock_timeout(SOCKET sock, int milliseconds) {
#ifdef _WIN32
DWORD t = milliseconds;
#else
struct timeval t;
t.tv_sec = milliseconds / 1000;
t.tv_usec = (milliseconds * 1000) % 1000000;
#endif
return setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, (void *) &t, sizeof(t)) ||
setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, (void *) &t, sizeof(t));
}
static void accept_new_connection(const struct socket *listener,
struct mg_context *ctx) {
struct socket so;
char src_addr[IP_ADDR_STR_LEN];
socklen_t len = sizeof(so.rsa);
int on = 1;
if ((so.sock = accept(listener->sock, &so.rsa.sa, &len)) == INVALID_SOCKET) {
} else if (!check_acl(ctx, ntohl(* (uint32_t *) &so.rsa.sin.sin_addr))) {
sockaddr_to_string(src_addr, sizeof(src_addr), &so.rsa);
cry(fc(ctx), "%s: %s is not allowed to connect", __func__, src_addr);
closesocket(so.sock);
} else {
// Put so socket structure into the queue
DEBUG_TRACE(("Accepted socket %d", (int) so.sock));
set_close_on_exec(so.sock);
so.is_ssl = listener->is_ssl;
so.ssl_redir = listener->ssl_redir;
getsockname(so.sock, &so.lsa.sa, &len);
// Set TCP keep-alive. This is needed because if HTTP-level keep-alive
// is enabled, and client resets the connection, server won't get
// TCP FIN or RST and will keep the connection open forever. With TCP
// keep-alive, next keep-alive handshake will figure out that the client
// is down and will close the server end.
// Thanks to Igor Klopov who suggested the patch.
setsockopt(so.sock, SOL_SOCKET, SO_KEEPALIVE, (void *) &on, sizeof(on));
set_sock_timeout(so.sock, atoi(ctx->config[REQUEST_TIMEOUT]));
produce_socket(ctx, &so);
}
}
static void *master_thread(void *thread_func_param) {
struct mg_context *ctx = (struct mg_context *) thread_func_param;
struct pollfd *pfd;
int i;
// Increase priority of the master thread
#if defined(_WIN32)
SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_ABOVE_NORMAL);
#endif
#if defined(ISSUE_317)
struct sched_param sched_param;
sched_param.sched_priority = sched_get_priority_max(SCHED_RR);
pthread_setschedparam(pthread_self(), SCHED_RR, &sched_param);
#endif
call_user(MG_THREAD_BEGIN, fc(ctx), NULL);
pfd = (struct pollfd *) calloc(ctx->num_listening_sockets, sizeof(pfd[0]));
while (pfd != NULL && ctx->stop_flag == 0) {
for (i = 0; i < ctx->num_listening_sockets; i++) {
pfd[i].fd = ctx->listening_sockets[i].sock;
pfd[i].events = POLLIN;
}
if (poll(pfd, ctx->num_listening_sockets, 200) > 0) {
for (i = 0; i < ctx->num_listening_sockets; i++) {
// NOTE(lsm): on QNX, poll() returns POLLRDNORM after the
// successfull poll, and POLLIN is defined as (POLLRDNORM | POLLRDBAND)
// Therefore, we're checking pfd[i].revents & POLLIN, not
// pfd[i].revents == POLLIN.
if (ctx->stop_flag == 0 && (pfd[i].revents & POLLIN)) {
accept_new_connection(&ctx->listening_sockets[i], ctx);
}
}
}
}
free(pfd);
DEBUG_TRACE(("stopping workers"));
// Stop signal received: somebody called mg_stop. Quit.
close_all_listening_sockets(ctx);
// Wakeup workers that are waiting for connections to handle.
pthread_cond_broadcast(&ctx->sq_full);
// Wait until all threads finish
(void) pthread_mutex_lock(&ctx->mutex);
while (ctx->num_threads > 0) {
(void) pthread_cond_wait(&ctx->cond, &ctx->mutex);
}
(void) pthread_mutex_unlock(&ctx->mutex);
// All threads exited, no sync is needed. Destroy mutex and condvars
(void) pthread_mutex_destroy(&ctx->mutex);
(void) pthread_cond_destroy(&ctx->cond);
(void) pthread_cond_destroy(&ctx->sq_empty);
(void) pthread_cond_destroy(&ctx->sq_full);
#if !defined(NO_SSL)
uninitialize_ssl(ctx);
#endif
DEBUG_TRACE(("exiting"));
call_user(MG_THREAD_END, fc(ctx), NULL);
// Signal mg_stop() that we're done.
// WARNING: This must be the very last thing this
// thread does, as ctx becomes invalid after this line.
ctx->stop_flag = 2;
return NULL;
}
static void free_context(struct mg_context *ctx) {
int i;
// Deallocate config parameters
for (i = 0; i < NUM_OPTIONS; i++) {
if (ctx->config[i] != NULL)
free(ctx->config[i]);
}
#ifndef NO_SSL
// Deallocate SSL context
if (ctx->ssl_ctx != NULL) {
SSL_CTX_free(ctx->ssl_ctx);
}
if (ssl_mutexes != NULL) {
free(ssl_mutexes);
ssl_mutexes = NULL;
}
#endif // !NO_SSL
// Deallocate context itself
free(ctx);
}
void mg_stop(struct mg_context *ctx) {
ctx->stop_flag = 1;
// Wait until mg_fini() stops
while (ctx->stop_flag != 2) {
(void) mg_sleep(10);
}
free_context(ctx);
#if defined(_WIN32) && !defined(__SYMBIAN32__)
(void) WSACleanup();
#endif // _WIN32
}
struct mg_context *mg_start(const char **options,
mg_event_handler_t func,
void *user_data) {
struct mg_context *ctx;
const char *name, *value, *default_value;
int i;
#if defined(_WIN32) && !defined(__SYMBIAN32__)
WSADATA data;
WSAStartup(MAKEWORD(2,2), &data);
#endif // _WIN32
// Allocate context and initialize reasonable general case defaults.
// TODO(lsm): do proper error handling here.
if ((ctx = (struct mg_context *) calloc(1, sizeof(*ctx))) == NULL) {
return NULL;
}
ctx->event_handler = func;
ctx->user_data = user_data;
while (options && (name = *options++) != NULL) {
if ((i = get_option_index(name)) == -1) {
cry(fc(ctx), "Invalid option: %s", name);
free_context(ctx);
return NULL;
} else if ((value = *options++) == NULL) {
cry(fc(ctx), "%s: option value cannot be NULL", name);
free_context(ctx);
return NULL;
}
if (ctx->config[i] != NULL) {
cry(fc(ctx), "warning: %s: duplicate option", name);
free(ctx->config[i]);
}
ctx->config[i] = mg_strdup(value);
DEBUG_TRACE(("[%s] -> [%s]", name, value));
}
// Set default value if needed
for (i = 0; config_options[i * 2] != NULL; i++) {
default_value = config_options[i * 2 + 1];
if (ctx->config[i] == NULL && default_value != NULL) {
ctx->config[i] = mg_strdup(default_value);
}
}
// NOTE(lsm): order is important here. SSL certificates must
// be initialized before listening ports. UID must be set last.
if (!set_gpass_option(ctx) ||
#if !defined(NO_SSL)
!set_ssl_option(ctx) ||
#endif
!set_ports_option(ctx) ||
#if !defined(_WIN32)
!set_uid_option(ctx) ||
#endif
!set_acl_option(ctx)) {
free_context(ctx);
return NULL;
}
#if !defined(_WIN32) && !defined(__SYMBIAN32__)
// Ignore SIGPIPE signal, so if browser cancels the request, it
// won't kill the whole process.
(void) signal(SIGPIPE, SIG_IGN);
#endif // !_WIN32
(void) pthread_mutex_init(&ctx->mutex, NULL);
(void) pthread_cond_init(&ctx->cond, NULL);
(void) pthread_cond_init(&ctx->sq_empty, NULL);
(void) pthread_cond_init(&ctx->sq_full, NULL);
// Start master (listening) thread
mg_start_thread(master_thread, ctx);
// Start worker threads
for (i = 0; i < atoi(ctx->config[NUM_THREADS]); i++) {
if (mg_start_thread(worker_thread, ctx) != 0) {
cry(fc(ctx), "Cannot start worker thread: %ld", (long) ERRNO);
} else {
ctx->num_threads++;
}
}
return ctx;
}