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http: proxying: allow for large headers

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set the buffer size (rpath) for header processing during
 proxying equal to the value in max_http_header_data
This commit is contained in:
Vitaliy Orazov 2021-12-13 18:51:22 +03:00 • committed by Andy Green
parent 91da9e30c7
commit e529720fc1
1 changed files with 6 additions and 4 deletions
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10
lib/roles/http/server/server.c
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@ -1248,10 +1248,12 @@ int
lws_http_proxy_start(struct lws *wsi, const struct lws_http_mount *hit,
char *uri_ptr, char ws)
{
char ads[96], rpath[256], host[96], *pcolon, *pslash, unix_skt = 0;
char ads[96], host[96], *pcolon, *pslash, unix_skt = 0;
struct lws_client_connect_info i;
struct lws *cwsi;
int n, na;
unsigned int max_http_header_data = wsi->a.context->max_http_header_data > 256 ? wsi->a.context->max_http_header_data : 256;
char rpath[max_http_header_data];
#if defined(LWS_ROLE_WS)
if (ws)
@ -1318,7 +1320,7 @@ lws_http_proxy_start(struct lws *wsi, const struct lws_http_mount *hit,
if (pcolon)
i.port = atoi(pcolon + 1);
n = lws_snprintf(rpath, sizeof(rpath) - 1, "/%s/%s",
n = lws_snprintf(rpath, max_http_header_data - 1, "/%s/%s",
pslash + 1, uri_ptr + hit->mountpoint_len) - 1;
lws_clean_url(rpath);
n = (int)strlen(rpath);
@ -1335,7 +1337,7 @@ lws_http_proxy_start(struct lws *wsi, const struct lws_http_mount *hit,
p = rpath + n;
if (na >= (int)sizeof(rpath) - n - 2) {
if (na >= (int)max_http_header_data - n - 2) {
lwsl_info("%s: query string %d longer "
"than we can handle\n", __func__,
na);
@ -1345,7 +1347,7 @@ lws_http_proxy_start(struct lws *wsi, const struct lws_http_mount *hit,
*p++ = '?';
budg = lws_hdr_copy(wsi, p,
(int)(&rpath[sizeof(rpath) - 1] - p),
(int)(&rpath[max_http_header_data - 1] - p),
WSI_TOKEN_HTTP_URI_ARGS);
if (budg > 0)
p += budg;