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Sergey Lyubka committed 2025-03-29 18:59:01 +00:00
1 parent e2ee356a87
commit 40a2a8822f
2 files changed
+9 -7
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src/net_builtin.c
+4 -3
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@@ -280,11 +280,12 @@ static const uint8_t broadcast[] = {255, 255, 255, 255, 255, 255};
// RFC-2131 #4.3.6, #4.4.1; RFC-2132 #9.8
static void tx_dhcp_request_sel(struct mg_tcpip_if *ifp, uint32_t ip_req,
uint32_t ip_srv) {
uint8_t extra = (ifp->enable_req_dns ? 1 : 0) + (ifp->enable_req_sntp ? 1 : 0);
uint8_t extra = (uint8_t) ((ifp->enable_req_dns ? 1 : 0) +
(ifp->enable_req_sntp ? 1 : 0));
size_t len = strlen(ifp->dhcp_name);
size_t olen = 21 + len + extra + 2 + 1; // Total length of options
size_t olen = 21 + len + extra + 2 + 1; // Total length of options
uint8_t *opts = alloca(olen), *p = opts; // Allocate options
*p++ = 53, *p++ = 1, *p++ = 3; // Type: DHCP request
*p++ = 53, *p++ = 1, *p++ = 3; // Type: DHCP request
*p++ = 54, *p++ = 4, memcpy(p, &ip_srv, 4), p += 4; // DHCP server ID
*p++ = 50, *p++ = 4, memcpy(p, &ip_req, 4), p += 4; // Requested IP
*p++ = 12, *p++ = (uint8_t) (len & 255); // DHCP host