diff options
Diffstat (limited to 'http.c')
| -rw-r--r-- | http.c | 1586 |
1 files changed, 1586 insertions, 0 deletions
diff --git a/http.c b/http.c new file mode 100644 index 0000000000..94e1afdee7 --- /dev/null +++ b/http.c @@ -0,0 +1,1586 @@ +#include "http.h" +#include "pack.h" +#include "sideband.h" +#include "run-command.h" +#include "url.h" +#include "urlmatch.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; +static int curl_save_cookies; +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)) { + ssl_cert_password_required = git_config_bool(var, value); + 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.savecookies", var)) { + curl_save_cookies = git_config_bool(var, value); + return 0; + } + + 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; +} + +#if LIBCURL_VERSION_NUM >= 0x071900 +static void set_curl_keepalive(CURL *c) +{ + curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1); +} + +#elif LIBCURL_VERSION_NUM >= 0x071000 +static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type) +{ + int ka = 1; + int rc; + socklen_t len = (socklen_t)sizeof(ka); + + if (type != CURLSOCKTYPE_IPCXN) + return 0; + + rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len); + if (rc < 0) + warning("unable to set SO_KEEPALIVE on socket %s", + strerror(errno)); + + return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */ +} + +static void set_curl_keepalive(CURL *c) +{ + curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback); +} + +#else +static void set_curl_keepalive(CURL *c) +{ + /* not supported on older curl versions */ +} +#endif + +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); + } + + set_curl_keepalive(result); + + 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; + char *normalized_url; + struct urlmatch_config config = { STRING_LIST_INIT_DUP }; + + config.section = "http"; + config.key = NULL; + config.collect_fn = http_options; + config.cascade_fn = git_default_config; + config.cb = NULL; + + http_is_verbose = 0; + normalized_url = url_normalize(url, &config.url); + + git_config(urlmatch_config_entry, &config); + free(normalized_url); + + 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") && + starts_with(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); + 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_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; +#if LIBCURL_VERSION_NUM >= 0x070a08 + curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL, + &slot->results->auth_avail); +#else + slot->results->auth_avail = 0; +#endif + } + + /* 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; + } +} + +int run_one_slot(struct active_request_slot *slot, + struct slot_results *results) +{ + slot->results = results; + if (!start_active_slot(slot)) { + snprintf(curl_errorstr, sizeof(curl_errorstr), + "failed to start HTTP request"); + return HTTP_START_FAILED; + } + + run_active_slot(slot); + return handle_curl_result(results); +} + +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(); + 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"); + + ret = run_one_slot(slot, &results); + + 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 (!starts_with(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 (starts_with(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, NULL) != 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 && + starts_with(data + i, " pack-") && + starts_with(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); + const 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; + } +} |