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http: add custom hostname to IP address resolutions

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Libcurl has a CURLOPT_RESOLVE easy option that allows
the result of hostname resolution in the following
format to be passed:

	[+]HOST:PORT:ADDRESS[,ADDRESS]

This way, redirects and everything operating against the
HOST+PORT will use the provided ADDRESS(s).

The following format is also allowed to stop using
hostname resolutions that have already been passed:

	-HOST:PORT

See https://curl.se/libcurl/c/CURLOPT_RESOLVE.html for
more details.

Let's add a corresponding "http.curloptResolve" config
option that takes advantage of CURLOPT_RESOLVE.

Each value configured for the "http.curloptResolve" key
is passed "as is" to libcurl through CURLOPT_RESOLVE, so
it should be in one of the above 2 formats. This keeps
the implementation simple and makes us consistent with
libcurl's CURLOPT_RESOLVE, and with curl's corresponding
`--resolve` command line option.

The implementation uses CURLOPT_RESOLVE only in
get_active_slot() which is called by all the HTTP
request sending functions.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Christian Couder
2022-05-16 10:38:51 +02:00
committed by Junio C Hamano
parent 6cd33dceed
commit 511cfd3bff
3 changed files with 41 additions and 0 deletions
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18
http.c
View File

@@ -128,6 +128,8 @@ static struct curl_slist *pragma_header;
static struct curl_slist *no_pragma_header;
static struct string_list extra_http_headers = STRING_LIST_INIT_DUP;
static struct curl_slist *host_resolutions;
static struct active_request_slot *active_queue_head;
static char *cached_accept_language;
@@ -393,6 +395,18 @@ static int http_options(const char *var, const char *value, void *cb)
return 0;
}
if (!strcmp("http.curloptresolve", var)) {
if (!value) {
return config_error_nonbool(var);
} else if (!*value) {
curl_slist_free_all(host_resolutions);
host_resolutions = NULL;
} else {
host_resolutions = curl_slist_append(host_resolutions, value);
}
return 0;
}
if (!strcmp("http.followredirects", var)) {
if (value && !strcmp(value, "initial"))
http_follow_config = HTTP_FOLLOW_INITIAL;
@@ -1131,6 +1145,9 @@ void http_cleanup(void)
curl_slist_free_all(no_pragma_header);
no_pragma_header = NULL;
curl_slist_free_all(host_resolutions);
host_resolutions = NULL;
if (curl_http_proxy) {
free((void *)curl_http_proxy);
curl_http_proxy = NULL;
@@ -1211,6 +1228,7 @@ struct active_request_slot *get_active_slot(void)
if (curl_save_cookies)
curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
curl_easy_setopt(slot->curl, CURLOPT_RESOLVE, host_resolutions);
curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);