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@xxxxxxxxxxxxx> --- Changes since v3: - Use gitbogusexamplehost.invalid instead of gitbogusexamplehost.com in the test. - Rebased on top of master at 277cf0bc36 (second 0th batch of topics from the previous cycle, 2022-05-11). Range diff: 1: 3d689f8a6f ! 1: a27ebf5988 http: add custom hostname to IP address resolutions @@ t/t5551-http-fetch-smart.sh: test_expect_success 'client falls back from v2 to v ' +test_expect_success 'passing hostname resolution information works' ' -+ BOGUS_HOST=gitbogusexamplehost.com && ++ BOGUS_HOST=gitbogusexamplehost.invalid && + BOGUS_HTTPD_URL=$HTTPD_PROTO://$BOGUS_HOST:$LIB_HTTPD_PORT && + test_must_fail git ls-remote "$BOGUS_HTTPD_URL/smart/repo.git" >/dev/null && + git -c "http.curloptResolve=$BOGUS_HOST:$LIB_HTTPD_PORT:127.0.0.1" ls-remote "$BOGUS_HTTPD_URL/smart/repo.git" >/dev/null Documentation/config/http.txt | 16 ++++++++++++++++ http.c | 18 ++++++++++++++++++ t/t5551-http-fetch-smart.sh | 7 +++++++ 3 files changed, 41 insertions(+) diff --git a/Documentation/config/http.txt b/Documentation/config/http.txt index 7003661c0d..179d03e57b 100644 --- a/Documentation/config/http.txt +++ b/Documentation/config/http.txt @@ -98,6 +98,22 @@ http.version:: - HTTP/2 - HTTP/1.1 +http.curloptResolve:: + Hostname resolution information that will be used first by + libcurl when sending HTTP requests. This information should + be in one of the following formats: + + - [+]HOST:PORT:ADDRESS[,ADDRESS] + - -HOST:PORT + ++ +The first format redirects all requests to the given `HOST:PORT` +to the provided `ADDRESS`(s). The second format clears all +previous config values for that `HOST:PORT` combination. To +allow easy overriding of all the settings inherited from the +system config, an empty value will reset all resolution +information to the empty list. + http.sslVersion:: The SSL version to use when negotiating an SSL connection, if you want to force the default. The available and default version diff --git a/http.c b/http.c index 229da4d148..8beacb95cc 100644 --- a/http.c +++ b/http.c @@ -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); diff --git a/t/t5551-http-fetch-smart.sh b/t/t5551-http-fetch-smart.sh index f92c79c132..b9351a732f 100755 --- a/t/t5551-http-fetch-smart.sh +++ b/t/t5551-http-fetch-smart.sh @@ -567,4 +567,11 @@ test_expect_success 'client falls back from v2 to v0 to match server' ' grep symref=HEAD:refs/heads/ trace ' +test_expect_success 'passing hostname resolution information works' ' + BOGUS_HOST=gitbogusexamplehost.invalid && + BOGUS_HTTPD_URL=$HTTPD_PROTO://$BOGUS_HOST:$LIB_HTTPD_PORT && + test_must_fail git ls-remote "$BOGUS_HTTPD_URL/smart/repo.git" >/dev/null && + git -c "http.curloptResolve=$BOGUS_HOST:$LIB_HTTPD_PORT:127.0.0.1" ls-remote "$BOGUS_HTTPD_URL/smart/repo.git" >/dev/null +' + test_done -- 2.36.1.75.ga27ebf5988
