int mg_vcasecmp(const struct mg_str *str1, const char *str2) {
size_t n2 = strlen(str2), n1 = str1->len;
int r = mg_ncasecmp(str1->p, str2, (n1 < n2) ? n1 : n2);
if (r == 0) {
return n1 - n2;
}
return r;
}
static void forward(struct conn_data *conn, struct http_message *hm,
struct peer *src_peer, struct peer *dst_peer) {
struct mg_connection *src = src_peer->nc;
struct mg_connection *dst = dst_peer->nc;
struct mbuf *io = &src->recv_mbuf;
int i;
int is_request = (src_peer == &conn->client);
src_peer->body_len = hm->body.len;
struct http_backend *be = conn->be_conn->be;
if (is_request) {
/* Write rewritten request line. */
size_t trim_len = strlen(be->uri_prefix);
mg_printf(dst, "%.*s%s%.*s\r\n", (int) (hm->uri.p - io->buf), io->buf,
be->uri_prefix_replacement,
(int) (hm->proto.p + hm->proto.len - (hm->uri.p + trim_len)),
hm->uri.p + trim_len);
} else {
/* Reply line goes without modification */
mg_printf(dst, "%.*s %d %.*s\r\n", (int) hm->proto.len, hm->proto.p,
(int) hm->resp_code, (int) hm->resp_status_msg.len,
hm->resp_status_msg.p);
}
/* Headers. */
for (i = 0; i < MG_MAX_HTTP_HEADERS && hm->header_names[i].len > 0; i++) {
struct mg_str hn = hm->header_names[i];
struct mg_str hv = hm->header_values[i];
#if MG_ENABLE_SSL
/*
* If we terminate SSL and backend redirects to local HTTP port,
* strip protocol to let client use HTTPS.
* TODO(lsm): web page content may also contain local HTTP references,
* they need to be rewritten too.
*/
if (mg_vcasecmp(&hn, "Location") == 0 && s_ssl_cert != NULL) {
size_t hlen = strlen(be->host_port);
const char *hp = be->host_port, *p = memchr(hp, ':', hlen);
if (p == NULL) {
p = hp + hlen;
}
if (mg_ncasecmp(hv.p, "http://", 7) == 0 &&
mg_ncasecmp(hv.p + 7, hp, (p - hp)) == 0) {
mg_printf(dst, "Location: %.*s\r\n", (int) (hv.len - (7 + (p - hp))),
hv.p + 7 + (p - hp));
continue;
}
}
#endif
/* We always rewrite the connection header depending on the settings. */
if (mg_vcasecmp(&hn, "Connection") == 0) continue;
/* Don't pass chunked transfer encoding to the client */
if (mg_vcasecmp(&hn, "Transfer-encoding") == 0 &&
mg_vcasecmp(&hv, "chunked") == 0) {
continue;
}
mg_printf(dst, "%.*s: %.*s\r\n", (int) hn.len, hn.p, (int) hv.len, hv.p);
}
/* Emit the connection header. */
const char *connection_mode = "close";
if (dst_peer == &conn->backend) {
if (s_backend_keepalive) connection_mode = "keep-alive";
} else {
if (conn->client.flags.keep_alive) connection_mode = "keep-alive";
}
mg_printf(dst, "Connection: %s\r\n", connection_mode);
mg_printf(dst, "%s", "\r\n");
mbuf_remove(io, hm->body.p - hm->message.p); /* We've forwarded headers */
dst_peer->flags.headers_sent = 1;
forward_body(src_peer, dst_peer);
}