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lws_http_cookie_get

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This commit is contained in:
Andy Green 2020-07-10 12:48:10 +01:00
parent cf41c3e793
commit 0bcfe88381
3 changed files with 81 additions and 12 deletions
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20
include/libwebsockets/lws-http.h
View file

@ -850,6 +850,26 @@ lws_http_compression_apply(struct lws *wsi, const char *name,
LWS_VISIBLE LWS_EXTERN int
lws_http_is_redirected_to_get(struct lws *wsi);
/**
* lws_http_cookie_get() - return copy of named cookie if present
*
* \param wsi: the wsi to check
* \param name: name of the cookie
* \param buf: buffer to store the cookie contents into
* \param max_len: on entry, maximum length of buf... on exit, used len of buf
*
* If no cookie header, or no cookie of the requested name, or the value is
* larger than can fit in buf, returns nonzero.
*
* If the cookie is found, copies its value into buf with a terminating NUL,
* sets *max_len to the used length, and returns 0.
*
* This handles the parsing of the possibly multi-cookie header string and
* terminating the requested cookie at the next ; if present.
*/
LWS_VISIBLE LWS_EXTERN int
lws_http_cookie_get(struct lws *wsi, const char *name, char *buf, size_t *max);
/**
* lws_http_client_http_error() - determine if the response code indicates an error
*

35
lib/core-net/dummy-callback.c
View file

@ -24,6 +24,9 @@
#include "private-lib-core.h"
/* max individual proxied header payload size */
#define MAXHDRVAL 1024
#if defined(LWS_WITH_HTTP_PROXY)
static int
proxy_header(struct lws *wsi, struct lws *par, unsigned char *temp,
@ -33,16 +36,23 @@ proxy_header(struct lws *wsi, struct lws *par, unsigned char *temp,
if (n < 1) {
lwsl_debug("%s: no index %d:\n", __func__, index);
return 0;
}
if (lws_hdr_copy(par, (char *)temp, temp_len, index) < 0)
if (lws_hdr_copy(par, (char *)temp, temp_len, index) < 0) {
lwsl_notice("%s: unable to copy par hdr idx %d (len %d)\n",
__func__, index, n);
return -1;
}
lwsl_debug("%s: index %d: %s\n", __func__, index, (char *)temp);
if (lws_add_http_header_by_token(wsi, index, temp, n, p, end))
if (lws_add_http_header_by_token(wsi, index, temp, n, p, end)) {
lwsl_notice("%s: unable to append par hdr idx %d (len %d)\n",
__func__, index, n);
return -1;
}
return 0;
}
@ -133,7 +143,7 @@ lws_callback_ws_proxy(struct lws *wsi, enum lws_callback_reasons reason,
case LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER:
{
unsigned char **p = (unsigned char **)in, *end = (*p) + len,
tmp[128];
tmp[MAXHDRVAL];
proxy_header(wsi, wsi->parent, tmp, sizeof(tmp),
WSI_TOKEN_HTTP_ACCEPT_LANGUAGE, p, end);
@ -250,6 +260,7 @@ const struct lws_protocols lws_ws_proxy = {
#endif
int
lws_callback_http_dummy(struct lws *wsi, enum lws_callback_reasons reason,
void *user, void *in, size_t len)
@ -482,7 +493,7 @@ lws_callback_http_dummy(struct lws *wsi, enum lws_callback_reasons reason,
return 0;
start = p = (unsigned char *)buf + LWS_PRE;
end = p + sizeof(buf) - LWS_PRE - 256;
end = p + sizeof(buf) - LWS_PRE - MAXHDRVAL;
if (lws_add_http_header_status(lws_get_parent(wsi),
lws_http_client_http_response(wsi), &p, end))
@ -492,21 +503,21 @@ lws_callback_http_dummy(struct lws *wsi, enum lws_callback_reasons reason,
* copy these headers from the client connection to the parent
*/
proxy_header(parent, wsi, end, 256,
proxy_header(parent, wsi, end, MAXHDRVAL,
WSI_TOKEN_HTTP_CONTENT_LENGTH, &p, end);
proxy_header(parent, wsi, end, 256,
proxy_header(parent, wsi, end, MAXHDRVAL,
WSI_TOKEN_HTTP_CONTENT_TYPE, &p, end);
proxy_header(parent, wsi, end, 256,
proxy_header(parent, wsi, end, MAXHDRVAL,
WSI_TOKEN_HTTP_ETAG, &p, end);
proxy_header(parent, wsi, end, 256,
proxy_header(parent, wsi, end, MAXHDRVAL,
WSI_TOKEN_HTTP_ACCEPT_LANGUAGE, &p, end);
proxy_header(parent, wsi, end, 256,
proxy_header(parent, wsi, end, MAXHDRVAL,
WSI_TOKEN_HTTP_CONTENT_ENCODING, &p, end);
proxy_header(parent, wsi, end, 256,
proxy_header(parent, wsi, end, MAXHDRVAL,
WSI_TOKEN_HTTP_CACHE_CONTROL, &p, end);
proxy_header(parent, wsi, end, 256,
proxy_header(parent, wsi, end, MAXHDRVAL,
WSI_TOKEN_HTTP_SET_COOKIE, &p, end);
proxy_header(parent, wsi, end, 256,
proxy_header(parent, wsi, end, MAXHDRVAL,
WSI_TOKEN_HTTP_LOCATION, &p, end);
if (!parent->mux_substream)

38
lib/roles/http/parsers.c
View file

@ -1459,3 +1459,41 @@ forbid:
return LPR_FORBIDDEN;
}
int
lws_http_cookie_get(struct lws *wsi, const char *name, char *buf,
size_t *max_len)
{
int n, bl = (int)strlen(name);
size_t max = *max_len;
char *p, *bo = buf;
n = lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_COOKIE);
if (n < bl + 1)
return 1;
p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP_COOKIE);
if (!p)
return 1;
p += bl;
n -= bl;
while (n-- > bl) {
if (*p == '=' && !memcmp(p - bl, name, bl)) {
p++;
while (*p != ';' && n-- && max) {
*buf++ = *p++;
max--;
}
if (!max)
return 2;
*buf = '\0';
*max_len = lws_ptr_diff(buf, bo);
return 0;
}
p++;
}
return 1;
}