Moved HTTP client, ssl and some util code into separate files

build/src/http_client.c

@@ -0,0 +1,93 @@
+#include "internal.h"
+
+static SOCKET conn2(const char *host, int port, int use_ssl,
+                    char *ebuf, size_t ebuf_len) {
+  struct sockaddr_in sin;
+  struct hostent *he;
+  SOCKET sock = INVALID_SOCKET;
+
+  if (host == NULL) {
+    snprintf(ebuf, ebuf_len, "%s", "NULL host");
+  } else if (use_ssl && SSLv23_client_method == NULL) {
+    snprintf(ebuf, ebuf_len, "%s", "SSL is not initialized");
+    // TODO(lsm): use something threadsafe instead of gethostbyname()
+  } else if ((he = gethostbyname(host)) == NULL) {
+    snprintf(ebuf, ebuf_len, "gethostbyname(%s): %s", host, strerror(ERRNO));
+  } else if ((sock = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {
+    snprintf(ebuf, ebuf_len, "socket(): %s", strerror(ERRNO));
+  } else {
+    set_close_on_exec(sock);
+    sin.sin_family = AF_INET;
+    sin.sin_port = htons((uint16_t) port);
+    sin.sin_addr = * (struct in_addr *) he->h_addr_list[0];
+    if (connect(sock, (struct sockaddr *) &sin, sizeof(sin)) != 0) {
+      snprintf(ebuf, ebuf_len, "connect(%s:%d): %s",
+               host, port, strerror(ERRNO));
+      closesocket(sock);
+      sock = INVALID_SOCKET;
+    }
+  }
+  return sock;
+}
+
+struct mg_connection *mg_connect(const char *host, int port, int use_ssl,
+                                 char *ebuf, size_t ebuf_len) {
+  static struct mg_context fake_ctx;
+  struct mg_connection *conn = NULL;
+  SOCKET sock;
+
+  if ((sock = conn2(host, port, use_ssl, ebuf, ebuf_len)) == INVALID_SOCKET) {
+  } else if ((conn = (struct mg_connection *)
+              calloc(1, sizeof(*conn) + MAX_REQUEST_SIZE)) == NULL) {
+    snprintf(ebuf, ebuf_len, "calloc(): %s", strerror(ERRNO));
+    closesocket(sock);
+#ifndef NO_SSL
+  } else if (use_ssl && (conn->client_ssl_ctx =
+                         SSL_CTX_new(SSLv23_client_method())) == NULL) {
+    snprintf(ebuf, ebuf_len, "SSL_CTX_new error");
+    closesocket(sock);
+    free(conn);
+    conn = NULL;
+#endif // NO_SSL
+  } else {
+    socklen_t len = sizeof(struct sockaddr);
+    conn->buf_size = MAX_REQUEST_SIZE;
+    conn->buf = (char *) (conn + 1);
+    conn->ctx = &fake_ctx;
+    conn->client.sock = sock;
+    getsockname(sock, &conn->client.rsa.sa, &len);
+    conn->client.is_ssl = use_ssl;
+#ifndef NO_SSL
+    if (use_ssl) {
+      // SSL_CTX_set_verify call is needed to switch off server certificate
+      // checking, which is off by default in OpenSSL and on in yaSSL.
+      SSL_CTX_set_verify(conn->client_ssl_ctx, 0, 0);
+      sslize(conn, conn->client_ssl_ctx, SSL_connect);
+    }
+#endif
+  }
+
+  return conn;
+}
+
+struct mg_connection *mg_download(const char *host, int port, int use_ssl,
+                                  char *ebuf, size_t ebuf_len,
+                                  const char *fmt, ...) {
+  struct mg_connection *conn;
+  va_list ap;
+
+  va_start(ap, fmt);
+  ebuf[0] = '\0';
+  if ((conn = mg_connect(host, port, use_ssl, ebuf, ebuf_len)) == NULL) {
+  } else if (mg_vprintf(conn, fmt, ap) <= 0) {
+    snprintf(ebuf, ebuf_len, "%s", "Error sending request");
+  } else {
+    getreq(conn, ebuf, ebuf_len);
+  }
+  if (ebuf[0] != '\0' && conn != NULL) {
+    mg_close_connection(conn);
+    conn = NULL;
+  }
+
+  return conn;
+}