diff options
Diffstat (limited to 'third_party/git/http-backend.c')
-rw-r--r-- | third_party/git/http-backend.c | 795 |
1 files changed, 0 insertions, 795 deletions
diff --git a/third_party/git/http-backend.c b/third_party/git/http-backend.c deleted file mode 100644 index a03b4bae2221..000000000000 --- a/third_party/git/http-backend.c +++ /dev/null @@ -1,795 +0,0 @@ -#include "cache.h" -#include "config.h" -#include "repository.h" -#include "refs.h" -#include "pkt-line.h" -#include "object.h" -#include "tag.h" -#include "exec-cmd.h" -#include "run-command.h" -#include "string-list.h" -#include "url.h" -#include "strvec.h" -#include "packfile.h" -#include "object-store.h" -#include "protocol.h" - -static const char content_type[] = "Content-Type"; -static const char content_length[] = "Content-Length"; -static const char last_modified[] = "Last-Modified"; -static int getanyfile = 1; -static unsigned long max_request_buffer = 10 * 1024 * 1024; - -static struct string_list *query_params; - -struct rpc_service { - const char *name; - const char *config_name; - unsigned buffer_input : 1; - signed enabled : 2; -}; - -static struct rpc_service rpc_service[] = { - { "upload-pack", "uploadpack", 1, 1 }, - { "receive-pack", "receivepack", 0, -1 }, -}; - -static struct string_list *get_parameters(void) -{ - if (!query_params) { - const char *query = getenv("QUERY_STRING"); - - query_params = xcalloc(1, sizeof(*query_params)); - while (query && *query) { - char *name = url_decode_parameter_name(&query); - char *value = url_decode_parameter_value(&query); - struct string_list_item *i; - - i = string_list_lookup(query_params, name); - if (!i) - i = string_list_insert(query_params, name); - else - free(i->util); - i->util = value; - } - } - return query_params; -} - -static const char *get_parameter(const char *name) -{ - struct string_list_item *i; - i = string_list_lookup(get_parameters(), name); - return i ? i->util : NULL; -} - -__attribute__((format (printf, 2, 3))) -static void format_write(int fd, const char *fmt, ...) -{ - static char buffer[1024]; - - va_list args; - unsigned n; - - va_start(args, fmt); - n = vsnprintf(buffer, sizeof(buffer), fmt, args); - va_end(args); - if (n >= sizeof(buffer)) - die("protocol error: impossibly long line"); - - write_or_die(fd, buffer, n); -} - -static void http_status(struct strbuf *hdr, unsigned code, const char *msg) -{ - strbuf_addf(hdr, "Status: %u %s\r\n", code, msg); -} - -static void hdr_str(struct strbuf *hdr, const char *name, const char *value) -{ - strbuf_addf(hdr, "%s: %s\r\n", name, value); -} - -static void hdr_int(struct strbuf *hdr, const char *name, uintmax_t value) -{ - strbuf_addf(hdr, "%s: %" PRIuMAX "\r\n", name, value); -} - -static void hdr_date(struct strbuf *hdr, const char *name, timestamp_t when) -{ - const char *value = show_date(when, 0, DATE_MODE(RFC2822)); - hdr_str(hdr, name, value); -} - -static void hdr_nocache(struct strbuf *hdr) -{ - hdr_str(hdr, "Expires", "Fri, 01 Jan 1980 00:00:00 GMT"); - hdr_str(hdr, "Pragma", "no-cache"); - hdr_str(hdr, "Cache-Control", "no-cache, max-age=0, must-revalidate"); -} - -static void hdr_cache_forever(struct strbuf *hdr) -{ - timestamp_t now = time(NULL); - hdr_date(hdr, "Date", now); - hdr_date(hdr, "Expires", now + 31536000); - hdr_str(hdr, "Cache-Control", "public, max-age=31536000"); -} - -static void end_headers(struct strbuf *hdr) -{ - strbuf_add(hdr, "\r\n", 2); - write_or_die(1, hdr->buf, hdr->len); - strbuf_release(hdr); -} - -__attribute__((format (printf, 2, 3))) -static NORETURN void not_found(struct strbuf *hdr, const char *err, ...) -{ - va_list params; - - http_status(hdr, 404, "Not Found"); - hdr_nocache(hdr); - end_headers(hdr); - - va_start(params, err); - if (err && *err) - vfprintf(stderr, err, params); - va_end(params); - exit(0); -} - -__attribute__((format (printf, 2, 3))) -static NORETURN void forbidden(struct strbuf *hdr, const char *err, ...) -{ - va_list params; - - http_status(hdr, 403, "Forbidden"); - hdr_nocache(hdr); - end_headers(hdr); - - va_start(params, err); - if (err && *err) - vfprintf(stderr, err, params); - va_end(params); - exit(0); -} - -static void select_getanyfile(struct strbuf *hdr) -{ - if (!getanyfile) - forbidden(hdr, "Unsupported service: getanyfile"); -} - -static void send_strbuf(struct strbuf *hdr, - const char *type, struct strbuf *buf) -{ - hdr_int(hdr, content_length, buf->len); - hdr_str(hdr, content_type, type); - end_headers(hdr); - write_or_die(1, buf->buf, buf->len); -} - -static void send_local_file(struct strbuf *hdr, const char *the_type, - const char *name) -{ - char *p = git_pathdup("%s", name); - size_t buf_alloc = 8192; - char *buf = xmalloc(buf_alloc); - int fd; - struct stat sb; - - fd = open(p, O_RDONLY); - if (fd < 0) - not_found(hdr, "Cannot open '%s': %s", p, strerror(errno)); - if (fstat(fd, &sb) < 0) - die_errno("Cannot stat '%s'", p); - - hdr_int(hdr, content_length, sb.st_size); - hdr_str(hdr, content_type, the_type); - hdr_date(hdr, last_modified, sb.st_mtime); - end_headers(hdr); - - for (;;) { - ssize_t n = xread(fd, buf, buf_alloc); - if (n < 0) - die_errno("Cannot read '%s'", p); - if (!n) - break; - write_or_die(1, buf, n); - } - close(fd); - free(buf); - free(p); -} - -static void get_text_file(struct strbuf *hdr, char *name) -{ - select_getanyfile(hdr); - hdr_nocache(hdr); - send_local_file(hdr, "text/plain", name); -} - -static void get_loose_object(struct strbuf *hdr, char *name) -{ - select_getanyfile(hdr); - hdr_cache_forever(hdr); - send_local_file(hdr, "application/x-git-loose-object", name); -} - -static void get_pack_file(struct strbuf *hdr, char *name) -{ - select_getanyfile(hdr); - hdr_cache_forever(hdr); - send_local_file(hdr, "application/x-git-packed-objects", name); -} - -static void get_idx_file(struct strbuf *hdr, char *name) -{ - select_getanyfile(hdr); - hdr_cache_forever(hdr); - send_local_file(hdr, "application/x-git-packed-objects-toc", name); -} - -static void http_config(void) -{ - int i, value = 0; - struct strbuf var = STRBUF_INIT; - - git_config_get_bool("http.getanyfile", &getanyfile); - git_config_get_ulong("http.maxrequestbuffer", &max_request_buffer); - - for (i = 0; i < ARRAY_SIZE(rpc_service); i++) { - struct rpc_service *svc = &rpc_service[i]; - strbuf_addf(&var, "http.%s", svc->config_name); - if (!git_config_get_bool(var.buf, &value)) - svc->enabled = value; - strbuf_reset(&var); - } - - strbuf_release(&var); -} - -static struct rpc_service *select_service(struct strbuf *hdr, const char *name) -{ - const char *svc_name; - struct rpc_service *svc = NULL; - int i; - - if (!skip_prefix(name, "git-", &svc_name)) - forbidden(hdr, "Unsupported service: '%s'", name); - - for (i = 0; i < ARRAY_SIZE(rpc_service); i++) { - struct rpc_service *s = &rpc_service[i]; - if (!strcmp(s->name, svc_name)) { - svc = s; - break; - } - } - - if (!svc) - forbidden(hdr, "Unsupported service: '%s'", name); - - if (svc->enabled < 0) { - const char *user = getenv("REMOTE_USER"); - svc->enabled = (user && *user) ? 1 : 0; - } - if (!svc->enabled) - forbidden(hdr, "Service not enabled: '%s'", svc->name); - return svc; -} - -static void write_to_child(int out, const unsigned char *buf, ssize_t len, const char *prog_name) -{ - if (write_in_full(out, buf, len) < 0) - die("unable to write to '%s'", prog_name); -} - -/* - * This is basically strbuf_read(), except that if we - * hit max_request_buffer we die (we'd rather reject a - * maliciously large request than chew up infinite memory). - */ -static ssize_t read_request_eof(int fd, unsigned char **out) -{ - size_t len = 0, alloc = 8192; - unsigned char *buf = xmalloc(alloc); - - if (max_request_buffer < alloc) - max_request_buffer = alloc; - - while (1) { - ssize_t cnt; - - cnt = read_in_full(fd, buf + len, alloc - len); - if (cnt < 0) { - free(buf); - return -1; - } - - /* partial read from read_in_full means we hit EOF */ - len += cnt; - if (len < alloc) { - *out = buf; - return len; - } - - /* otherwise, grow and try again (if we can) */ - if (alloc == max_request_buffer) - die("request was larger than our maximum size (%lu);" - " try setting GIT_HTTP_MAX_REQUEST_BUFFER", - max_request_buffer); - - alloc = alloc_nr(alloc); - if (alloc > max_request_buffer) - alloc = max_request_buffer; - REALLOC_ARRAY(buf, alloc); - } -} - -static ssize_t read_request_fixed_len(int fd, ssize_t req_len, unsigned char **out) -{ - unsigned char *buf = NULL; - ssize_t cnt = 0; - - if (max_request_buffer < req_len) { - die("request was larger than our maximum size (%lu): " - "%" PRIuMAX "; try setting GIT_HTTP_MAX_REQUEST_BUFFER", - max_request_buffer, (uintmax_t)req_len); - } - - buf = xmalloc(req_len); - cnt = read_in_full(fd, buf, req_len); - if (cnt < 0) { - free(buf); - return -1; - } - *out = buf; - return cnt; -} - -static ssize_t get_content_length(void) -{ - ssize_t val = -1; - const char *str = getenv("CONTENT_LENGTH"); - - if (str && *str && !git_parse_ssize_t(str, &val)) - die("failed to parse CONTENT_LENGTH: %s", str); - return val; -} - -static ssize_t read_request(int fd, unsigned char **out, ssize_t req_len) -{ - if (req_len < 0) - return read_request_eof(fd, out); - else - return read_request_fixed_len(fd, req_len, out); -} - -static void inflate_request(const char *prog_name, int out, int buffer_input, ssize_t req_len) -{ - git_zstream stream; - unsigned char *full_request = NULL; - unsigned char in_buf[8192]; - unsigned char out_buf[8192]; - unsigned long cnt = 0; - int req_len_defined = req_len >= 0; - size_t req_remaining_len = req_len; - - memset(&stream, 0, sizeof(stream)); - git_inflate_init_gzip_only(&stream); - - while (1) { - ssize_t n; - - if (buffer_input) { - if (full_request) - n = 0; /* nothing left to read */ - else - n = read_request(0, &full_request, req_len); - stream.next_in = full_request; - } else { - ssize_t buffer_len; - if (req_len_defined && req_remaining_len <= sizeof(in_buf)) - buffer_len = req_remaining_len; - else - buffer_len = sizeof(in_buf); - n = xread(0, in_buf, buffer_len); - stream.next_in = in_buf; - if (req_len_defined && n > 0) - req_remaining_len -= n; - } - - if (n <= 0) - die("request ended in the middle of the gzip stream"); - stream.avail_in = n; - - while (0 < stream.avail_in) { - int ret; - - stream.next_out = out_buf; - stream.avail_out = sizeof(out_buf); - - ret = git_inflate(&stream, Z_NO_FLUSH); - if (ret != Z_OK && ret != Z_STREAM_END) - die("zlib error inflating request, result %d", ret); - - n = stream.total_out - cnt; - write_to_child(out, out_buf, stream.total_out - cnt, prog_name); - cnt = stream.total_out; - - if (ret == Z_STREAM_END) - goto done; - } - } - -done: - git_inflate_end(&stream); - close(out); - free(full_request); -} - -static void copy_request(const char *prog_name, int out, ssize_t req_len) -{ - unsigned char *buf; - ssize_t n = read_request(0, &buf, req_len); - if (n < 0) - die_errno("error reading request body"); - write_to_child(out, buf, n, prog_name); - close(out); - free(buf); -} - -static void pipe_fixed_length(const char *prog_name, int out, size_t req_len) -{ - unsigned char buf[8192]; - size_t remaining_len = req_len; - - while (remaining_len > 0) { - size_t chunk_length = remaining_len > sizeof(buf) ? sizeof(buf) : remaining_len; - ssize_t n = xread(0, buf, chunk_length); - if (n < 0) - die_errno("Reading request failed"); - write_to_child(out, buf, n, prog_name); - remaining_len -= n; - } - - close(out); -} - -static void run_service(const char **argv, int buffer_input) -{ - const char *encoding = getenv("HTTP_CONTENT_ENCODING"); - const char *user = getenv("REMOTE_USER"); - const char *host = getenv("REMOTE_ADDR"); - int gzipped_request = 0; - struct child_process cld = CHILD_PROCESS_INIT; - ssize_t req_len = get_content_length(); - - if (encoding && !strcmp(encoding, "gzip")) - gzipped_request = 1; - else if (encoding && !strcmp(encoding, "x-gzip")) - gzipped_request = 1; - - if (!user || !*user) - user = "anonymous"; - if (!host || !*host) - host = "(none)"; - - if (!getenv("GIT_COMMITTER_NAME")) - strvec_pushf(&cld.env_array, "GIT_COMMITTER_NAME=%s", user); - if (!getenv("GIT_COMMITTER_EMAIL")) - strvec_pushf(&cld.env_array, - "GIT_COMMITTER_EMAIL=%s@http.%s", user, host); - - cld.argv = argv; - if (buffer_input || gzipped_request || req_len >= 0) - cld.in = -1; - cld.git_cmd = 1; - cld.clean_on_exit = 1; - cld.wait_after_clean = 1; - if (start_command(&cld)) - exit(1); - - close(1); - if (gzipped_request) - inflate_request(argv[0], cld.in, buffer_input, req_len); - else if (buffer_input) - copy_request(argv[0], cld.in, req_len); - else if (req_len >= 0) - pipe_fixed_length(argv[0], cld.in, req_len); - else - close(0); - - if (finish_command(&cld)) - exit(1); -} - -static int show_text_ref(const char *name, const struct object_id *oid, - int flag, void *cb_data) -{ - const char *name_nons = strip_namespace(name); - struct strbuf *buf = cb_data; - struct object *o = parse_object(the_repository, oid); - if (!o) - return 0; - - strbuf_addf(buf, "%s\t%s\n", oid_to_hex(oid), name_nons); - if (o->type == OBJ_TAG) { - o = deref_tag(the_repository, o, name, 0); - if (!o) - return 0; - strbuf_addf(buf, "%s\t%s^{}\n", oid_to_hex(&o->oid), - name_nons); - } - return 0; -} - -static void get_info_refs(struct strbuf *hdr, char *arg) -{ - const char *service_name = get_parameter("service"); - struct strbuf buf = STRBUF_INIT; - - hdr_nocache(hdr); - - if (service_name) { - const char *argv[] = {NULL /* service name */, - "--stateless-rpc", "--advertise-refs", - ".", NULL}; - struct rpc_service *svc = select_service(hdr, service_name); - - strbuf_addf(&buf, "application/x-git-%s-advertisement", - svc->name); - hdr_str(hdr, content_type, buf.buf); - end_headers(hdr); - - - if (determine_protocol_version_server() != protocol_v2) { - packet_write_fmt(1, "# service=git-%s\n", svc->name); - packet_flush(1); - } - - argv[0] = svc->name; - run_service(argv, 0); - - } else { - select_getanyfile(hdr); - for_each_namespaced_ref(show_text_ref, &buf); - send_strbuf(hdr, "text/plain", &buf); - } - strbuf_release(&buf); -} - -static int show_head_ref(const char *refname, const struct object_id *oid, - int flag, void *cb_data) -{ - struct strbuf *buf = cb_data; - - if (flag & REF_ISSYMREF) { - const char *target = resolve_ref_unsafe(refname, - RESOLVE_REF_READING, - NULL, NULL); - - if (target) - strbuf_addf(buf, "ref: %s\n", strip_namespace(target)); - } else { - strbuf_addf(buf, "%s\n", oid_to_hex(oid)); - } - - return 0; -} - -static void get_head(struct strbuf *hdr, char *arg) -{ - struct strbuf buf = STRBUF_INIT; - - select_getanyfile(hdr); - head_ref_namespaced(show_head_ref, &buf); - send_strbuf(hdr, "text/plain", &buf); - strbuf_release(&buf); -} - -static void get_info_packs(struct strbuf *hdr, char *arg) -{ - size_t objdirlen = strlen(get_object_directory()); - struct strbuf buf = STRBUF_INIT; - struct packed_git *p; - size_t cnt = 0; - - select_getanyfile(hdr); - for (p = get_all_packs(the_repository); p; p = p->next) { - if (p->pack_local) - cnt++; - } - - strbuf_grow(&buf, cnt * 53 + 2); - for (p = get_all_packs(the_repository); p; p = p->next) { - if (p->pack_local) - strbuf_addf(&buf, "P %s\n", p->pack_name + objdirlen + 6); - } - strbuf_addch(&buf, '\n'); - - hdr_nocache(hdr); - send_strbuf(hdr, "text/plain; charset=utf-8", &buf); - strbuf_release(&buf); -} - -static void check_content_type(struct strbuf *hdr, const char *accepted_type) -{ - const char *actual_type = getenv("CONTENT_TYPE"); - - if (!actual_type) - actual_type = ""; - - if (strcmp(actual_type, accepted_type)) { - http_status(hdr, 415, "Unsupported Media Type"); - hdr_nocache(hdr); - end_headers(hdr); - format_write(1, - "Expected POST with Content-Type '%s'," - " but received '%s' instead.\n", - accepted_type, actual_type); - exit(0); - } -} - -static void service_rpc(struct strbuf *hdr, char *service_name) -{ - const char *argv[] = {NULL, "--stateless-rpc", ".", NULL}; - struct rpc_service *svc = select_service(hdr, service_name); - struct strbuf buf = STRBUF_INIT; - - strbuf_reset(&buf); - strbuf_addf(&buf, "application/x-git-%s-request", svc->name); - check_content_type(hdr, buf.buf); - - hdr_nocache(hdr); - - strbuf_reset(&buf); - strbuf_addf(&buf, "application/x-git-%s-result", svc->name); - hdr_str(hdr, content_type, buf.buf); - - end_headers(hdr); - - argv[0] = svc->name; - run_service(argv, svc->buffer_input); - strbuf_release(&buf); -} - -static int dead; -static NORETURN void die_webcgi(const char *err, va_list params) -{ - if (dead <= 1) { - struct strbuf hdr = STRBUF_INIT; - - vreportf("fatal: ", err, params); - - http_status(&hdr, 500, "Internal Server Error"); - hdr_nocache(&hdr); - end_headers(&hdr); - } - exit(0); /* we successfully reported a failure ;-) */ -} - -static int die_webcgi_recursing(void) -{ - return dead++ > 1; -} - -static char* getdir(void) -{ - struct strbuf buf = STRBUF_INIT; - char *pathinfo = getenv("PATH_INFO"); - char *root = getenv("GIT_PROJECT_ROOT"); - char *path = getenv("PATH_TRANSLATED"); - - if (root && *root) { - if (!pathinfo || !*pathinfo) - die("GIT_PROJECT_ROOT is set but PATH_INFO is not"); - if (daemon_avoid_alias(pathinfo)) - die("'%s': aliased", pathinfo); - end_url_with_slash(&buf, root); - if (pathinfo[0] == '/') - pathinfo++; - strbuf_addstr(&buf, pathinfo); - return strbuf_detach(&buf, NULL); - } else if (path && *path) { - return xstrdup(path); - } else - die("No GIT_PROJECT_ROOT or PATH_TRANSLATED from server"); - return NULL; -} - -static struct service_cmd { - const char *method; - const char *pattern; - void (*imp)(struct strbuf *, char *); -} services[] = { - {"GET", "/HEAD$", get_head}, - {"GET", "/info/refs$", get_info_refs}, - {"GET", "/objects/info/alternates$", get_text_file}, - {"GET", "/objects/info/http-alternates$", get_text_file}, - {"GET", "/objects/info/packs$", get_info_packs}, - {"GET", "/objects/[0-9a-f]{2}/[0-9a-f]{38}$", get_loose_object}, - {"GET", "/objects/[0-9a-f]{2}/[0-9a-f]{62}$", get_loose_object}, - {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.pack$", get_pack_file}, - {"GET", "/objects/pack/pack-[0-9a-f]{64}\\.pack$", get_pack_file}, - {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.idx$", get_idx_file}, - {"GET", "/objects/pack/pack-[0-9a-f]{64}\\.idx$", get_idx_file}, - - {"POST", "/git-upload-pack$", service_rpc}, - {"POST", "/git-receive-pack$", service_rpc} -}; - -static int bad_request(struct strbuf *hdr, const struct service_cmd *c) -{ - const char *proto = getenv("SERVER_PROTOCOL"); - - if (proto && !strcmp(proto, "HTTP/1.1")) { - http_status(hdr, 405, "Method Not Allowed"); - hdr_str(hdr, "Allow", - !strcmp(c->method, "GET") ? "GET, HEAD" : c->method); - } else - http_status(hdr, 400, "Bad Request"); - hdr_nocache(hdr); - end_headers(hdr); - return 0; -} - -int cmd_main(int argc, const char **argv) -{ - char *method = getenv("REQUEST_METHOD"); - char *dir; - struct service_cmd *cmd = NULL; - char *cmd_arg = NULL; - int i; - struct strbuf hdr = STRBUF_INIT; - - set_die_routine(die_webcgi); - set_die_is_recursing_routine(die_webcgi_recursing); - - if (!method) - die("No REQUEST_METHOD from server"); - if (!strcmp(method, "HEAD")) - method = "GET"; - dir = getdir(); - - for (i = 0; i < ARRAY_SIZE(services); i++) { - struct service_cmd *c = &services[i]; - regex_t re; - regmatch_t out[1]; - - if (regcomp(&re, c->pattern, REG_EXTENDED)) - die("Bogus regex in service table: %s", c->pattern); - if (!regexec(&re, dir, 1, out, 0)) { - size_t n; - - if (strcmp(method, c->method)) - return bad_request(&hdr, c); - - cmd = c; - n = out[0].rm_eo - out[0].rm_so; - cmd_arg = xmemdupz(dir + out[0].rm_so + 1, n - 1); - dir[out[0].rm_so] = 0; - break; - } - regfree(&re); - } - - if (!cmd) - not_found(&hdr, "Request not supported: '%s'", dir); - - setup_path(); - if (!enter_repo(dir, 0)) - not_found(&hdr, "Not a git repository: '%s'", dir); - if (!getenv("GIT_HTTP_EXPORT_ALL") && - access("git-daemon-export-ok", F_OK) ) - not_found(&hdr, "Repository not exported: '%s'", dir); - - http_config(); - max_request_buffer = git_env_ulong("GIT_HTTP_MAX_REQUEST_BUFFER", - max_request_buffer); - - cmd->imp(&hdr, cmd_arg); - return 0; -} |