#include "http.h" #include "pack.h" #include "sideband.h" #include "run-command.h" #include "url.h" #include "credential.h" #include "version.h" #include "pkt-line.h" int active_requests; int http_is_verbose; size_t http_post_buffer = 16 * LARGE_PACKET_MAX; #if LIBCURL_VERSION_NUM >= 0x070a06 #define LIBCURL_CAN_HANDLE_AUTH_ANY #endif static int min_curl_sessions = 1; static int curl_session_count; #ifdef USE_CURL_MULTI static int max_requests = -1; static CURLM *curlm; #endif #ifndef NO_CURL_EASY_DUPHANDLE static CURL *curl_default; #endif #define PREV_BUF_SIZE 4096 #define RANGE_HEADER_SIZE 30 char curl_errorstr[CURL_ERROR_SIZE]; static int curl_ssl_verify = -1; static int curl_ssl_try; static const char *ssl_cert; #if LIBCURL_VERSION_NUM >= 0x070903 static const char *ssl_key; #endif #if LIBCURL_VERSION_NUM >= 0x070908 static const char *ssl_capath; #endif static const char *ssl_cainfo; static long curl_low_speed_limit = -1; static long curl_low_speed_time = -1; static int curl_ftp_no_epsv; static const char *curl_http_proxy; static const char *curl_cookie_file; struct credential http_auth = CREDENTIAL_INIT; static int http_proactive_auth; static const char *user_agent; #if LIBCURL_VERSION_NUM >= 0x071700 /* Use CURLOPT_KEYPASSWD as is */ #elif LIBCURL_VERSION_NUM >= 0x070903 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD #else #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD #endif static struct credential cert_auth = CREDENTIAL_INIT; static int ssl_cert_password_required; static struct curl_slist *pragma_header; static struct curl_slist *no_pragma_header; static struct active_request_slot *active_queue_head; size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_) { size_t size = eltsize * nmemb; struct buffer *buffer = buffer_; if (size > buffer->buf.len - buffer->posn) size = buffer->buf.len - buffer->posn; memcpy(ptr, buffer->buf.buf + buffer->posn, size); buffer->posn += size; return size; } #ifndef NO_CURL_IOCTL curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp) { struct buffer *buffer = clientp; switch (cmd) { case CURLIOCMD_NOP: return CURLIOE_OK; case CURLIOCMD_RESTARTREAD: buffer->posn = 0; return CURLIOE_OK; default: return CURLIOE_UNKNOWNCMD; } } #endif size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_) { size_t size = eltsize * nmemb; struct strbuf *buffer = buffer_; strbuf_add(buffer, ptr, size); return size; } size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf) { return eltsize * nmemb; } #ifdef USE_CURL_MULTI static void process_curl_messages(void) { int num_messages; struct active_request_slot *slot; CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages); while (curl_message != NULL) { if (curl_message->msg == CURLMSG_DONE) { int curl_result = curl_message->data.result; slot = active_queue_head; while (slot != NULL && slot->curl != curl_message->easy_handle) slot = slot->next; if (slot != NULL) { curl_multi_remove_handle(curlm, slot->curl); slot->curl_result = curl_result; finish_active_slot(slot); } else { fprintf(stderr, "Received DONE message for unknown request!\n"); } } else { fprintf(stderr, "Unknown CURL message received: %d\n", (int)curl_message->msg); } curl_message = curl_multi_info_read(curlm, &num_messages); } } #endif static int http_options(const char *var, const char *value, void *cb) { if (!strcmp("http.sslverify", var)) { curl_ssl_verify = git_config_bool(var, value); return 0; } if (!strcmp("http.sslcert", var)) return git_config_string(&ssl_cert, var, value); #if LIBCURL_VERSION_NUM >= 0x070903 if (!strcmp("http.sslkey", var)) return git_config_string(&ssl_key, var, value); #endif #if LIBCURL_VERSION_NUM >= 0x070908 if (!strcmp("http.sslcapath", var)) return git_config_string(&ssl_capath, var, value); #endif if (!strcmp("http.sslcainfo", var)) return git_config_string(&ssl_cainfo, var, value); if (!strcmp("http.sslcertpasswordprotected", var)) { if (git_config_bool(var, value)) ssl_cert_password_required = 1; return 0; } if (!strcmp("http.ssltry", var)) { curl_ssl_try = git_config_bool(var, value); return 0; } if (!strcmp("http.minsessions", var)) { min_curl_sessions = git_config_int(var, value); #ifndef USE_CURL_MULTI if (min_curl_sessions > 1) min_curl_sessions = 1; #endif return 0; } #ifdef USE_CURL_MULTI if (!strcmp("http.maxrequests", var)) { max_requests = git_config_int(var, value); return 0; } #endif if (!strcmp("http.lowspeedlimit", var)) { curl_low_speed_limit = (long)git_config_int(var, value); return 0; } if (!strcmp("http.lowspeedtime", var)) { curl_low_speed_time = (long)git_config_int(var, value); return 0; } if (!strcmp("http.noepsv", var)) { curl_ftp_no_epsv = git_config_bool(var, value); return 0; } if (!strcmp("http.proxy", var)) return git_config_string(&curl_http_proxy, var, value); if (!strcmp("http.cookiefile", var)) return git_config_string(&curl_cookie_file, var, value); if (!strcmp("http.postbuffer", var)) { http_post_buffer = git_config_int(var, value); if (http_post_buffer < LARGE_PACKET_MAX) http_post_buffer = LARGE_PACKET_MAX; return 0; } if (!strcmp("http.useragent", var)) return git_config_string(&user_agent, var, value); /* Fall back on the default ones */ return git_default_config(var, value, cb); } static void init_curl_http_auth(CURL *result) { if (!http_auth.username) return; credential_fill(&http_auth); #if LIBCURL_VERSION_NUM >= 0x071301 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username); curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password); #else { static struct strbuf up = STRBUF_INIT; /* * Note that we assume we only ever have a single set of * credentials in a given program run, so we do not have * to worry about updating this buffer, only setting its * initial value. */ if (!up.len) strbuf_addf(&up, "%s:%s", http_auth.username, http_auth.password); curl_easy_setopt(result, CURLOPT_USERPWD, up.buf); } #endif } static int has_cert_password(void) { if (ssl_cert == NULL || ssl_cert_password_required != 1) return 0; if (!cert_auth.password) { cert_auth.protocol = xstrdup("cert"); cert_auth.username = xstrdup(""); cert_auth.path = xstrdup(ssl_cert); credential_fill(&cert_auth); } return 1; } static CURL *get_curl_handle(void) { CURL *result = curl_easy_init(); if (!curl_ssl_verify) { curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0); curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0); } else { /* Verify authenticity of the peer's certificate */ curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1); /* The name in the cert must match whom we tried to connect */ curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2); } #if LIBCURL_VERSION_NUM >= 0x070907 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL); #endif #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY); #endif if (http_proactive_auth) init_curl_http_auth(result); if (ssl_cert != NULL) curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert); if (has_cert_password()) curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password); #if LIBCURL_VERSION_NUM >= 0x070903 if (ssl_key != NULL) curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key); #endif #if LIBCURL_VERSION_NUM >= 0x070908 if (ssl_capath != NULL) curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath); #endif if (ssl_cainfo != NULL) curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo); if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) { curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT, curl_low_speed_limit); curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME, curl_low_speed_time); } curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1); #if LIBCURL_VERSION_NUM >= 0x071301 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL); #elif LIBCURL_VERSION_NUM >= 0x071101 curl_easy_setopt(result, CURLOPT_POST301, 1); #endif if (getenv("GIT_CURL_VERBOSE")) curl_easy_setopt(result, CURLOPT_VERBOSE, 1); curl_easy_setopt(result, CURLOPT_USERAGENT, user_agent ? user_agent : git_user_agent()); if (curl_ftp_no_epsv) curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0); #ifdef CURLOPT_USE_SSL if (curl_ssl_try) curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY); #endif if (curl_http_proxy) { curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy); curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY); } return result; } static void set_from_env(const char **var, const char *envname) { const char *val = getenv(envname); if (val) *var = val; } void http_init(struct remote *remote, const char *url, int proactive_auth) { char *low_speed_limit; char *low_speed_time; http_is_verbose = 0; git_config(http_options, NULL); curl_global_init(CURL_GLOBAL_ALL); http_proactive_auth = proactive_auth; if (remote && remote->http_proxy) curl_http_proxy = xstrdup(remote->http_proxy); pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache"); no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:"); #ifdef USE_CURL_MULTI { char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS"); if (http_max_requests != NULL) max_requests = atoi(http_max_requests); } curlm = curl_multi_init(); if (curlm == NULL) { fprintf(stderr, "Error creating curl multi handle.\n"); exit(1); } #endif if (getenv("GIT_SSL_NO_VERIFY")) curl_ssl_verify = 0; set_from_env(&ssl_cert, "GIT_SSL_CERT"); #if LIBCURL_VERSION_NUM >= 0x070903 set_from_env(&ssl_key, "GIT_SSL_KEY"); #endif #if LIBCURL_VERSION_NUM >= 0x070908 set_from_env(&ssl_capath, "GIT_SSL_CAPATH"); #endif set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO"); set_from_env(&user_agent, "GIT_HTTP_USER_AGENT"); low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT"); if (low_speed_limit != NULL) curl_low_speed_limit = strtol(low_speed_limit, NULL, 10); low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME"); if (low_speed_time != NULL) curl_low_speed_time = strtol(low_speed_time, NULL, 10); if (curl_ssl_verify == -1) curl_ssl_verify = 1; curl_session_count = 0; #ifdef USE_CURL_MULTI if (max_requests < 1) max_requests = DEFAULT_MAX_REQUESTS; #endif if (getenv("GIT_CURL_FTP_NO_EPSV")) curl_ftp_no_epsv = 1; if (url) { credential_from_url(&http_auth, url); if (!ssl_cert_password_required && getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") && !prefixcmp(url, "https://")) ssl_cert_password_required = 1; } #ifndef NO_CURL_EASY_DUPHANDLE curl_default = get_curl_handle(); #endif } void http_cleanup(void) { struct active_request_slot *slot = active_queue_head; while (slot != NULL) { struct active_request_slot *next = slot->next; if (slot->curl != NULL) { #ifdef USE_CURL_MULTI curl_multi_remove_handle(curlm, slot->curl); #endif curl_easy_cleanup(slot->curl); } free(slot); slot = next; } active_queue_head = NULL; #ifndef NO_CURL_EASY_DUPHANDLE curl_easy_cleanup(curl_default); #endif #ifdef USE_CURL_MULTI curl_multi_cleanup(curlm); #endif curl_global_cleanup(); curl_slist_free_all(pragma_header); pragma_header = NULL; curl_slist_free_all(no_pragma_header); no_pragma_header = NULL; if (curl_http_proxy) { free((void *)curl_http_proxy); curl_http_proxy = NULL; } if (cert_auth.password != NULL) { memset(cert_auth.password, 0, strlen(cert_auth.password)); free(cert_auth.password); cert_auth.password = NULL; } ssl_cert_password_required = 0; } struct active_request_slot *get_active_slot(void) { struct active_request_slot *slot = active_queue_head; struct active_request_slot *newslot; #ifdef USE_CURL_MULTI int num_transfers; /* Wait for a slot to open up if the queue is full */ while (active_requests >= max_requests) { curl_multi_perform(curlm, &num_transfers); if (num_transfers < active_requests) process_curl_messages(); } #endif while (slot != NULL && slot->in_use) slot = slot->next; if (slot == NULL) { newslot = xmalloc(sizeof(*newslot)); newslot->curl = NULL; newslot->in_use = 0; newslot->next = NULL; slot = active_queue_head; if (slot == NULL) { active_queue_head = newslot; } else { while (slot->next != NULL) slot = slot->next; slot->next = newslot; } slot = newslot; } if (slot->curl == NULL) { #ifdef NO_CURL_EASY_DUPHANDLE slot->curl = get_curl_handle(); #else slot->curl = curl_easy_duphandle(curl_default); #endif curl_session_count++; } active_requests++; slot->in_use = 1; slot->results = NULL; slot->finished = NULL; slot->callback_data = NULL; slot->callback_func = NULL; curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file); curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header); 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); curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL); curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL); curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0); curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1); if (http_auth.password) init_curl_http_auth(slot->curl); return slot; } int start_active_slot(struct active_request_slot *slot) { #ifdef USE_CURL_MULTI CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl); int num_transfers; if (curlm_result != CURLM_OK && curlm_result != CURLM_CALL_MULTI_PERFORM) { active_requests--; slot->in_use = 0; return 0; } /* * We know there must be something to do, since we just added * something. */ curl_multi_perform(curlm, &num_transfers); #endif return 1; } #ifdef USE_CURL_MULTI struct fill_chain { void *data; int (*fill)(void *); struct fill_chain *next; }; static struct fill_chain *fill_cfg; void add_fill_function(void *data, int (*fill)(void *)) { struct fill_chain *new = xmalloc(sizeof(*new)); struct fill_chain **linkp = &fill_cfg; new->data = data; new->fill = fill; new->next = NULL; while (*linkp) linkp = &(*linkp)->next; *linkp = new; } void fill_active_slots(void) { struct active_request_slot *slot = active_queue_head; while (active_requests < max_requests) { struct fill_chain *fill; for (fill = fill_cfg; fill; fill = fill->next) if (fill->fill(fill->data)) break; if (!fill) break; } while (slot != NULL) { if (!slot->in_use && slot->curl != NULL && curl_session_count > min_curl_sessions) { curl_easy_cleanup(slot->curl); slot->curl = NULL; curl_session_count--; } slot = slot->next; } } void step_active_slots(void) { int num_transfers; CURLMcode curlm_result; do { curlm_result = curl_multi_perform(curlm, &num_transfers); } while (curlm_result == CURLM_CALL_MULTI_PERFORM); if (num_transfers < active_requests) { process_curl_messages(); fill_active_slots(); } } #endif void run_active_slot(struct active_request_slot *slot) { #ifdef USE_CURL_MULTI fd_set readfds; fd_set writefds; fd_set excfds; int max_fd; struct timeval select_timeout; int finished = 0; slot->finished = &finished; while (!finished) { step_active_slots(); if (slot->in_use) { #if LIBCURL_VERSION_NUM >= 0x070f04 long curl_timeout; curl_multi_timeout(curlm, &curl_timeout); if (curl_timeout == 0) { continue; } else if (curl_timeout == -1) { select_timeout.tv_sec = 0; select_timeout.tv_usec = 50000; } else { select_timeout.tv_sec = curl_timeout / 1000; select_timeout.tv_usec = (curl_timeout % 1000) * 1000; } #else select_timeout.tv_sec = 0; select_timeout.tv_usec = 50000; #endif max_fd = -1; FD_ZERO(&readfds); FD_ZERO(&writefds); FD_ZERO(&excfds); curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd); /* * It can happen that curl_multi_timeout returns a pathologically * long timeout when curl_multi_fdset returns no file descriptors * to read. See commit message for more details. */ if (max_fd < 0 && (select_timeout.tv_sec > 0 || select_timeout.tv_usec > 50000)) { select_timeout.tv_sec = 0; select_timeout.tv_usec = 50000; } select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout); } } #else while (slot->in_use) { slot->curl_result = curl_easy_perform(slot->curl); finish_active_slot(slot); } #endif } static void closedown_active_slot(struct active_request_slot *slot) { active_requests--; slot->in_use = 0; } static void release_active_slot(struct active_request_slot *slot) { closedown_active_slot(slot); if (slot->curl && curl_session_count > min_curl_sessions) { #ifdef USE_CURL_MULTI curl_multi_remove_handle(curlm, slot->curl); #endif curl_easy_cleanup(slot->curl); slot->curl = NULL; curl_session_count--; } #ifdef USE_CURL_MULTI fill_active_slots(); #endif } void finish_active_slot(struct active_request_slot *slot) { closedown_active_slot(slot); curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code); if (slot->finished != NULL) (*slot->finished) = 1; /* Store slot results so they can be read after the slot is reused */ if (slot->results != NULL) { slot->results->curl_result = slot->curl_result; slot->results->http_code = slot->http_code; } /* Run callback if appropriate */ if (slot->callback_func != NULL) slot->callback_func(slot->callback_data); } void finish_all_active_slots(void) { struct active_request_slot *slot = active_queue_head; while (slot != NULL) if (slot->in_use) { run_active_slot(slot); slot = active_queue_head; } else { slot = slot->next; } } /* Helpers for modifying and creating URLs */ static inline int needs_quote(int ch) { if (((ch >= 'A') && (ch <= 'Z')) || ((ch >= 'a') && (ch <= 'z')) || ((ch >= '0') && (ch <= '9')) || (ch == '/') || (ch == '-') || (ch == '.')) return 0; return 1; } static char *quote_ref_url(const char *base, const char *ref) { struct strbuf buf = STRBUF_INIT; const char *cp; int ch; end_url_with_slash(&buf, base); for (cp = ref; (ch = *cp) != 0; cp++) if (needs_quote(ch)) strbuf_addf(&buf, "%%%02x", ch); else strbuf_addch(&buf, *cp); return strbuf_detach(&buf, NULL); } void append_remote_object_url(struct strbuf *buf, const char *url, const char *hex, int only_two_digit_prefix) { end_url_with_slash(buf, url); strbuf_addf(buf, "objects/%.*s/", 2, hex); if (!only_two_digit_prefix) strbuf_addf(buf, "%s", hex+2); } char *get_remote_object_url(const char *url, const char *hex, int only_two_digit_prefix) { struct strbuf buf = STRBUF_INIT; append_remote_object_url(&buf, url, hex, only_two_digit_prefix); return strbuf_detach(&buf, NULL); } int handle_curl_result(struct slot_results *results) { /* * If we see a failing http code with CURLE_OK, we have turned off * FAILONERROR (to keep the server's custom error response), and should * translate the code into failure here. */ if (results->curl_result == CURLE_OK && results->http_code >= 400) { results->curl_result = CURLE_HTTP_RETURNED_ERROR; /* * Normally curl will already have put the "reason phrase" * from the server into curl_errorstr; unfortunately without * FAILONERROR it is lost, so we can give only the numeric * status code. */ snprintf(curl_errorstr, sizeof(curl_errorstr), "The requested URL returned error: %ld", results->http_code); } if (results->curl_result == CURLE_OK) { credential_approve(&http_auth); return HTTP_OK; } else if (missing_target(results)) return HTTP_MISSING_TARGET; else if (results->http_code == 401) { if (http_auth.username && http_auth.password) { credential_reject(&http_auth); return HTTP_NOAUTH; } else { return HTTP_REAUTH; } } else { #if LIBCURL_VERSION_NUM >= 0x070c00 if (!curl_errorstr[0]) strlcpy(curl_errorstr, curl_easy_strerror(results->curl_result), sizeof(curl_errorstr)); #endif return HTTP_ERROR; } } static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf) { char *ptr; CURLcode ret; strbuf_reset(buf); ret = curl_easy_getinfo(curl, info, &ptr); if (!ret && ptr) strbuf_addstr(buf, ptr); return ret; } /* http_request() targets */ #define HTTP_REQUEST_STRBUF 0 #define HTTP_REQUEST_FILE 1 static int http_request(const char *url, void *result, int target, const struct http_get_options *options) { struct active_request_slot *slot; struct slot_results results; struct curl_slist *headers = NULL; struct strbuf buf = STRBUF_INIT; int ret; slot = get_active_slot(); slot->results = &results; curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); if (result == NULL) { curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1); } else { curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0); curl_easy_setopt(slot->curl, CURLOPT_FILE, result); if (target == HTTP_REQUEST_FILE) { long posn = ftell(result); curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite); if (posn > 0) { strbuf_addf(&buf, "Range: bytes=%ld-", posn); headers = curl_slist_append(headers, buf.buf); strbuf_reset(&buf); } } else curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer); } strbuf_addstr(&buf, "Pragma:"); if (options && options->no_cache) strbuf_addstr(&buf, " no-cache"); if (options && options->keep_error) curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0); headers = curl_slist_append(headers, buf.buf); curl_easy_setopt(slot->curl, CURLOPT_URL, url); curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers); curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip"); if (start_active_slot(slot)) { run_active_slot(slot); ret = handle_curl_result(&results); } else { snprintf(curl_errorstr, sizeof(curl_errorstr), "failed to start HTTP request"); ret = HTTP_START_FAILED; } if (options && options->content_type) curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, options->content_type); if (options && options->effective_url) curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL, options->effective_url); curl_slist_free_all(headers); strbuf_release(&buf); return ret; } /* * Update the "base" url to a more appropriate value, as deduced by * redirects seen when requesting a URL starting with "url". * * The "asked" parameter is a URL that we asked curl to access, and must begin * with "base". * * The "got" parameter is the URL that curl reported to us as where we ended * up. * * Returns 1 if we updated the base url, 0 otherwise. * * Our basic strategy is to compare "base" and "asked" to find the bits * specific to our request. We then strip those bits off of "got" to yield the * new base. So for example, if our base is "http://example.com/foo.git", * and we ask for "http://example.com/foo.git/info/refs", we might end up * with "https://other.example.com/foo.git/info/refs". We would want the * new URL to become "https://other.example.com/foo.git". * * Note that this assumes a sane redirect scheme. It's entirely possible * in the example above to end up at a URL that does not even end in * "info/refs". In such a case we simply punt, as there is not much we can * do (and such a scheme is unlikely to represent a real git repository, * which means we are likely about to abort anyway). */ static int update_url_from_redirect(struct strbuf *base, const char *asked, const struct strbuf *got) { const char *tail; size_t tail_len; if (!strcmp(asked, got->buf)) return 0; if (prefixcmp(asked, base->buf)) die("BUG: update_url_from_redirect: %s is not a superset of %s", asked, base->buf); tail = asked + base->len; tail_len = strlen(tail); if (got->len < tail_len || strcmp(tail, got->buf + got->len - tail_len)) return 0; /* insane redirect scheme */ strbuf_reset(base); strbuf_add(base, got->buf, got->len - tail_len); return 1; } static int http_request_reauth(const char *url, void *result, int target, struct http_get_options *options) { int ret = http_request(url, result, target, options); if (options && options->effective_url && options->base_url) { if (update_url_from_redirect(options->base_url, url, options->effective_url)) { credential_from_url(&http_auth, options->base_url->buf); url = options->effective_url->buf; } } if (ret != HTTP_REAUTH) return ret; /* * If we are using KEEP_ERROR, the previous request may have * put cruft into our output stream; we should clear it out before * making our next request. We only know how to do this for * the strbuf case, but that is enough to satisfy current callers. */ if (options && options->keep_error) { switch (target) { case HTTP_REQUEST_STRBUF: strbuf_reset(result); break; default: die("BUG: HTTP_KEEP_ERROR is only supported with strbufs"); } } credential_fill(&http_auth); return http_request(url, result, target, options); } int http_get_strbuf(const char *url, struct strbuf *result, struct http_get_options *options) { return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options); } /* * Downloads a URL and stores the result in the given file. * * If a previous interrupted download is detected (i.e. a previous temporary * file is still around) the download is resumed. */ static int http_get_file(const char *url, const char *filename, struct http_get_options *options) { int ret; struct strbuf tmpfile = STRBUF_INIT; FILE *result; strbuf_addf(&tmpfile, "%s.temp", filename); result = fopen(tmpfile.buf, "a"); if (!result) { error("Unable to open local file %s", tmpfile.buf); ret = HTTP_ERROR; goto cleanup; } ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options); fclose(result); if (ret == HTTP_OK && move_temp_to_file(tmpfile.buf, filename)) ret = HTTP_ERROR; cleanup: strbuf_release(&tmpfile); return ret; } int http_fetch_ref(const char *base, struct ref *ref) { struct http_get_options options = {0}; char *url; struct strbuf buffer = STRBUF_INIT; int ret = -1; options.no_cache = 1; url = quote_ref_url(base, ref->name); if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) { strbuf_rtrim(&buffer); if (buffer.len == 40) ret = get_sha1_hex(buffer.buf, ref->old_sha1); else if (!prefixcmp(buffer.buf, "ref: ")) { ref->symref = xstrdup(buffer.buf + 5); ret = 0; } } strbuf_release(&buffer); free(url); return ret; } /* Helpers for fetching packs */ static char *fetch_pack_index(unsigned char *sha1, const char *base_url) { char *url, *tmp; struct strbuf buf = STRBUF_INIT; if (http_is_verbose) fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1)); end_url_with_slash(&buf, base_url); strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1)); url = strbuf_detach(&buf, NULL); strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1)); tmp = strbuf_detach(&buf, NULL); if (http_get_file(url, tmp, 0) != HTTP_OK) { error("Unable to get pack index %s", url); free(tmp); tmp = NULL; } free(url); return tmp; } static int fetch_and_setup_pack_index(struct packed_git **packs_head, unsigned char *sha1, const char *base_url) { struct packed_git *new_pack; char *tmp_idx = NULL; int ret; if (has_pack_index(sha1)) { new_pack = parse_pack_index(sha1, NULL); if (!new_pack) return -1; /* parse_pack_index() already issued error message */ goto add_pack; } tmp_idx = fetch_pack_index(sha1, base_url); if (!tmp_idx) return -1; new_pack = parse_pack_index(sha1, tmp_idx); if (!new_pack) { unlink(tmp_idx); free(tmp_idx); return -1; /* parse_pack_index() already issued error message */ } ret = verify_pack_index(new_pack); if (!ret) { close_pack_index(new_pack); ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1)); } free(tmp_idx); if (ret) return -1; add_pack: new_pack->next = *packs_head; *packs_head = new_pack; return 0; } int http_get_info_packs(const char *base_url, struct packed_git **packs_head) { struct http_get_options options = {0}; int ret = 0, i = 0; char *url, *data; struct strbuf buf = STRBUF_INIT; unsigned char sha1[20]; end_url_with_slash(&buf, base_url); strbuf_addstr(&buf, "objects/info/packs"); url = strbuf_detach(&buf, NULL); options.no_cache = 1; ret = http_get_strbuf(url, &buf, &options); if (ret != HTTP_OK) goto cleanup; data = buf.buf; while (i < buf.len) { switch (data[i]) { case 'P': i++; if (i + 52 <= buf.len && !prefixcmp(data + i, " pack-") && !prefixcmp(data + i + 46, ".pack\n")) { get_sha1_hex(data + i + 6, sha1); fetch_and_setup_pack_index(packs_head, sha1, base_url); i += 51; break; } default: while (i < buf.len && data[i] != '\n') i++; } i++; } cleanup: free(url); return ret; } void release_http_pack_request(struct http_pack_request *preq) { if (preq->packfile != NULL) { fclose(preq->packfile); preq->packfile = NULL; } if (preq->range_header != NULL) { curl_slist_free_all(preq->range_header); preq->range_header = NULL; } preq->slot = NULL; free(preq->url); } int finish_http_pack_request(struct http_pack_request *preq) { struct packed_git **lst; struct packed_git *p = preq->target; char *tmp_idx; struct child_process ip; const char *ip_argv[8]; close_pack_index(p); fclose(preq->packfile); preq->packfile = NULL; lst = preq->lst; while (*lst != p) lst = &((*lst)->next); *lst = (*lst)->next; tmp_idx = xstrdup(preq->tmpfile); strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"), ".idx.temp"); ip_argv[0] = "index-pack"; ip_argv[1] = "-o"; ip_argv[2] = tmp_idx; ip_argv[3] = preq->tmpfile; ip_argv[4] = NULL; memset(&ip, 0, sizeof(ip)); ip.argv = ip_argv; ip.git_cmd = 1; ip.no_stdin = 1; ip.no_stdout = 1; if (run_command(&ip)) { unlink(preq->tmpfile); unlink(tmp_idx); free(tmp_idx); return -1; } unlink(sha1_pack_index_name(p->sha1)); if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1)) || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) { free(tmp_idx); return -1; } install_packed_git(p); free(tmp_idx); return 0; } struct http_pack_request *new_http_pack_request( struct packed_git *target, const char *base_url) { long prev_posn = 0; char range[RANGE_HEADER_SIZE]; struct strbuf buf = STRBUF_INIT; struct http_pack_request *preq; preq = xcalloc(1, sizeof(*preq)); preq->target = target; end_url_with_slash(&buf, base_url); strbuf_addf(&buf, "objects/pack/pack-%s.pack", sha1_to_hex(target->sha1)); preq->url = strbuf_detach(&buf, NULL); snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp", sha1_pack_name(target->sha1)); preq->packfile = fopen(preq->tmpfile, "a"); if (!preq->packfile) { error("Unable to open local file %s for pack", preq->tmpfile); goto abort; } preq->slot = get_active_slot(); curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile); curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite); curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url); curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header); /* * If there is data present from a previous transfer attempt, * resume where it left off */ prev_posn = ftell(preq->packfile); if (prev_posn>0) { if (http_is_verbose) fprintf(stderr, "Resuming fetch of pack %s at byte %ld\n", sha1_to_hex(target->sha1), prev_posn); sprintf(range, "Range: bytes=%ld-", prev_posn); preq->range_header = curl_slist_append(NULL, range); curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER, preq->range_header); } return preq; abort: free(preq->url); free(preq); return NULL; } /* Helpers for fetching objects (loose) */ static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb, void *data) { unsigned char expn[4096]; size_t size = eltsize * nmemb; int posn = 0; struct http_object_request *freq = (struct http_object_request *)data; do { ssize_t retval = xwrite(freq->localfile, (char *) ptr + posn, size - posn); if (retval < 0) return posn; posn += retval; } while (posn < size); freq->stream.avail_in = size; freq->stream.next_in = (void *)ptr; do { freq->stream.next_out = expn; freq->stream.avail_out = sizeof(expn); freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH); git_SHA1_Update(&freq->c, expn, sizeof(expn) - freq->stream.avail_out); } while (freq->stream.avail_in && freq->zret == Z_OK); return size; } struct http_object_request *new_http_object_request(const char *base_url, unsigned char *sha1) { char *hex = sha1_to_hex(sha1); char *filename; char prevfile[PATH_MAX]; int prevlocal; char prev_buf[PREV_BUF_SIZE]; ssize_t prev_read = 0; long prev_posn = 0; char range[RANGE_HEADER_SIZE]; struct curl_slist *range_header = NULL; struct http_object_request *freq; freq = xcalloc(1, sizeof(*freq)); hashcpy(freq->sha1, sha1); freq->localfile = -1; filename = sha1_file_name(sha1); snprintf(freq->tmpfile, sizeof(freq->tmpfile), "%s.temp", filename); snprintf(prevfile, sizeof(prevfile), "%s.prev", filename); unlink_or_warn(prevfile); rename(freq->tmpfile, prevfile); unlink_or_warn(freq->tmpfile); if (freq->localfile != -1) error("fd leakage in start: %d", freq->localfile); freq->localfile = open(freq->tmpfile, O_WRONLY | O_CREAT | O_EXCL, 0666); /* * This could have failed due to the "lazy directory creation"; * try to mkdir the last path component. */ if (freq->localfile < 0 && errno == ENOENT) { char *dir = strrchr(freq->tmpfile, '/'); if (dir) { *dir = 0; mkdir(freq->tmpfile, 0777); *dir = '/'; } freq->localfile = open(freq->tmpfile, O_WRONLY | O_CREAT | O_EXCL, 0666); } if (freq->localfile < 0) { error("Couldn't create temporary file %s: %s", freq->tmpfile, strerror(errno)); goto abort; } git_inflate_init(&freq->stream); git_SHA1_Init(&freq->c); freq->url = get_remote_object_url(base_url, hex, 0); /* * If a previous temp file is present, process what was already * fetched. */ prevlocal = open(prevfile, O_RDONLY); if (prevlocal != -1) { do { prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE); if (prev_read>0) { if (fwrite_sha1_file(prev_buf, 1, prev_read, freq) == prev_read) { prev_posn += prev_read; } else { prev_read = -1; } } } while (prev_read > 0); close(prevlocal); } unlink_or_warn(prevfile); /* * Reset inflate/SHA1 if there was an error reading the previous temp * file; also rewind to the beginning of the local file. */ if (prev_read == -1) { memset(&freq->stream, 0, sizeof(freq->stream)); git_inflate_init(&freq->stream); git_SHA1_Init(&freq->c); if (prev_posn>0) { prev_posn = 0; lseek(freq->localfile, 0, SEEK_SET); if (ftruncate(freq->localfile, 0) < 0) { error("Couldn't truncate temporary file %s: %s", freq->tmpfile, strerror(errno)); goto abort; } } } freq->slot = get_active_slot(); curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq); curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file); curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr); curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url); curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header); /* * If we have successfully processed data from a previous fetch * attempt, only fetch the data we don't already have. */ if (prev_posn>0) { if (http_is_verbose) fprintf(stderr, "Resuming fetch of object %s at byte %ld\n", hex, prev_posn); sprintf(range, "Range: bytes=%ld-", prev_posn); range_header = curl_slist_append(range_header, range); curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, range_header); } return freq; abort: free(freq->url); free(freq); return NULL; } void process_http_object_request(struct http_object_request *freq) { if (freq->slot == NULL) return; freq->curl_result = freq->slot->curl_result; freq->http_code = freq->slot->http_code; freq->slot = NULL; } int finish_http_object_request(struct http_object_request *freq) { struct stat st; close(freq->localfile); freq->localfile = -1; process_http_object_request(freq); if (freq->http_code == 416) { warning("requested range invalid; we may already have all the data."); } else if (freq->curl_result != CURLE_OK) { if (stat(freq->tmpfile, &st) == 0) if (st.st_size == 0) unlink_or_warn(freq->tmpfile); return -1; } git_inflate_end(&freq->stream); git_SHA1_Final(freq->real_sha1, &freq->c); if (freq->zret != Z_STREAM_END) { unlink_or_warn(freq->tmpfile); return -1; } if (hashcmp(freq->sha1, freq->real_sha1)) { unlink_or_warn(freq->tmpfile); return -1; } freq->rename = move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1)); return freq->rename; } void abort_http_object_request(struct http_object_request *freq) { unlink_or_warn(freq->tmpfile); release_http_object_request(freq); } void release_http_object_request(struct http_object_request *freq) { if (freq->localfile != -1) { close(freq->localfile); freq->localfile = -1; } if (freq->url != NULL) { free(freq->url); freq->url = NULL; } if (freq->slot != NULL) { freq->slot->callback_func = NULL; freq->slot->callback_data = NULL; release_active_slot(freq->slot); freq->slot = NULL; } }