#include "git-compat-util.h" #include "cache.h" #include "config.h" #include "pkt-line.h" #include "quote.h" #include "refs.h" #include "run-command.h" #include "remote.h" #include "connect.h" #include "url.h" #include "string-list.h" #include "oid-array.h" #include "transport.h" #include "strbuf.h" #include "version.h" #include "protocol.h" #include "alias.h" static char *server_capabilities_v1; static struct strvec server_capabilities_v2 = STRVEC_INIT; static const char *next_server_feature_value(const char *feature, int *len, int *offset); static int check_ref(const char *name, unsigned int flags) { if (!flags) return 1; if (!skip_prefix(name, "refs/", &name)) return 0; /* REF_NORMAL means that we don't want the magic fake tag refs */ if ((flags & REF_NORMAL) && check_refname_format(name, 0)) return 0; /* REF_HEADS means that we want regular branch heads */ if ((flags & REF_HEADS) && starts_with(name, "heads/")) return 1; /* REF_TAGS means that we want tags */ if ((flags & REF_TAGS) && starts_with(name, "tags/")) return 1; /* All type bits clear means that we are ok with anything */ return !(flags & ~REF_NORMAL); } int check_ref_type(const struct ref *ref, int flags) { return check_ref(ref->name, flags); } static NORETURN void die_initial_contact(int unexpected) { /* * A hang-up after seeing some response from the other end * means that it is unexpected, as we know the other end is * willing to talk to us. A hang-up before seeing any * response does not necessarily mean an ACL problem, though. */ if (unexpected) die(_("the remote end hung up upon initial contact")); else die(_("Could not read from remote repository.\n\n" "Please make sure you have the correct access rights\n" "and the repository exists.")); } /* Checks if the server supports the capability 'c' */ int server_supports_v2(const char *c, int die_on_error) { int i; for (i = 0; i < server_capabilities_v2.nr; i++) { const char *out; if (skip_prefix(server_capabilities_v2.v[i], c, &out) && (!*out || *out == '=')) return 1; } if (die_on_error) die(_("server doesn't support '%s'"), c); return 0; } int server_feature_v2(const char *c, const char **v) { int i; for (i = 0; i < server_capabilities_v2.nr; i++) { const char *out; if (skip_prefix(server_capabilities_v2.v[i], c, &out) && (*out == '=')) { *v = out + 1; return 1; } } return 0; } int server_supports_feature(const char *c, const char *feature, int die_on_error) { int i; for (i = 0; i < server_capabilities_v2.nr; i++) { const char *out; if (skip_prefix(server_capabilities_v2.v[i], c, &out) && (!*out || *(out++) == '=')) { if (parse_feature_request(out, feature)) return 1; else break; } } if (die_on_error) die(_("server doesn't support feature '%s'"), feature); return 0; } static void process_capabilities_v2(struct packet_reader *reader) { while (packet_reader_read(reader) == PACKET_READ_NORMAL) strvec_push(&server_capabilities_v2, reader->line); if (reader->status != PACKET_READ_FLUSH) die(_("expected flush after capabilities")); } enum protocol_version discover_version(struct packet_reader *reader) { enum protocol_version version = protocol_unknown_version; /* * Peek the first line of the server's response to * determine the protocol version the server is speaking. */ switch (packet_reader_peek(reader)) { case PACKET_READ_EOF: die_initial_contact(0); case PACKET_READ_FLUSH: case PACKET_READ_DELIM: case PACKET_READ_RESPONSE_END: version = protocol_v0; break; case PACKET_READ_NORMAL: version = determine_protocol_version_client(reader->line); break; } switch (version) { case protocol_v2: process_capabilities_v2(reader); break; case protocol_v1: /* Read the peeked version line */ packet_reader_read(reader); break; case protocol_v0: break; case protocol_unknown_version: BUG("unknown protocol version"); } return version; } static void parse_one_symref_info(struct string_list *symref, const char *val, int len) { char *sym, *target; struct string_list_item *item; if (!len) return; /* just "symref" */ /* e.g. "symref=HEAD:refs/heads/master" */ sym = xmemdupz(val, len); target = strchr(sym, ':'); if (!target) /* just "symref=something" */ goto reject; *(target++) = '\0'; if (check_refname_format(sym, REFNAME_ALLOW_ONELEVEL) || check_refname_format(target, REFNAME_ALLOW_ONELEVEL)) /* "symref=bogus:pair */ goto reject; item = string_list_append_nodup(symref, sym); item->util = target; return; reject: free(sym); return; } static void annotate_refs_with_symref_info(struct ref *ref) { struct string_list symref = STRING_LIST_INIT_DUP; int offset = 0; while (1) { int len; const char *val; val = next_server_feature_value("symref", &len, &offset); if (!val) break; parse_one_symref_info(&symref, val, len); } string_list_sort(&symref); for (; ref; ref = ref->next) { struct string_list_item *item; item = string_list_lookup(&symref, ref->name); if (!item) continue; ref->symref = xstrdup((char *)item->util); } string_list_clear(&symref, 0); } static void process_capabilities(struct packet_reader *reader, int *linelen) { const char *feat_val; int feat_len; const char *line = reader->line; int nul_location = strlen(line); if (nul_location == *linelen) return; server_capabilities_v1 = xstrdup(line + nul_location + 1); *linelen = nul_location; feat_val = server_feature_value("object-format", &feat_len); if (feat_val) { char *hash_name = xstrndup(feat_val, feat_len); int hash_algo = hash_algo_by_name(hash_name); if (hash_algo != GIT_HASH_UNKNOWN) reader->hash_algo = &hash_algos[hash_algo]; free(hash_name); } else { reader->hash_algo = &hash_algos[GIT_HASH_SHA1]; } } static int process_dummy_ref(const struct packet_reader *reader) { const char *line = reader->line; struct object_id oid; const char *name; if (parse_oid_hex_algop(line, &oid, &name, reader->hash_algo)) return 0; if (*name != ' ') return 0; name++; return oideq(&null_oid, &oid) && !strcmp(name, "capabilities^{}"); } static void check_no_capabilities(const char *line, int len) { if (strlen(line) != len) warning(_("ignoring capabilities after first line '%s'"), line + strlen(line)); } static int process_ref(const struct packet_reader *reader, int len, struct ref ***list, unsigned int flags, struct oid_array *extra_have) { const char *line = reader->line; struct object_id old_oid; const char *name; if (parse_oid_hex_algop(line, &old_oid, &name, reader->hash_algo)) return 0; if (*name != ' ') return 0; name++; if (extra_have && !strcmp(name, ".have")) { oid_array_append(extra_have, &old_oid); } else if (!strcmp(name, "capabilities^{}")) { die(_("protocol error: unexpected capabilities^{}")); } else if (check_ref(name, flags)) { struct ref *ref = alloc_ref(name); oidcpy(&ref->old_oid, &old_oid); **list = ref; *list = &ref->next; } check_no_capabilities(line, len); return 1; } static int process_shallow(const struct packet_reader *reader, int len, struct oid_array *shallow_points) { const char *line = reader->line; const char *arg; struct object_id old_oid; if (!skip_prefix(line, "shallow ", &arg)) return 0; if (get_oid_hex_algop(arg, &old_oid, reader->hash_algo)) die(_("protocol error: expected shallow sha-1, got '%s'"), arg); if (!shallow_points) die(_("repository on the other end cannot be shallow")); oid_array_append(shallow_points, &old_oid); check_no_capabilities(line, len); return 1; } enum get_remote_heads_state { EXPECTING_FIRST_REF = 0, EXPECTING_REF, EXPECTING_SHALLOW, EXPECTING_DONE, }; /* * Read all the refs from the other end */ struct ref **get_remote_heads(struct packet_reader *reader, struct ref **list, unsigned int flags, struct oid_array *extra_have, struct oid_array *shallow_points) { struct ref **orig_list = list; int len = 0; enum get_remote_heads_state state = EXPECTING_FIRST_REF; *list = NULL; while (state != EXPECTING_DONE) { switch (packet_reader_read(reader)) { case PACKET_READ_EOF: die_initial_contact(1); case PACKET_READ_NORMAL: len = reader->pktlen; break; case PACKET_READ_FLUSH: state = EXPECTING_DONE; break; case PACKET_READ_DELIM: case PACKET_READ_RESPONSE_END: die(_("invalid packet")); } switch (state) { case EXPECTING_FIRST_REF: process_capabilities(reader, &len); if (process_dummy_ref(reader)) { state = EXPECTING_SHALLOW; break; } state = EXPECTING_REF; /* fallthrough */ case EXPECTING_REF: if (process_ref(reader, len, &list, flags, extra_have)) break; state = EXPECTING_SHALLOW; /* fallthrough */ case EXPECTING_SHALLOW: if (process_shallow(reader, len, shallow_points)) break; die(_("protocol error: unexpected '%s'"), reader->line); case EXPECTING_DONE: break; } } annotate_refs_with_symref_info(*orig_list); return list; } /* Returns 1 when a valid ref has been added to `list`, 0 otherwise */ static int process_ref_v2(struct packet_reader *reader, struct ref ***list, char **unborn_head_target) { int ret = 1; int i = 0; struct object_id old_oid; struct ref *ref; struct string_list line_sections = STRING_LIST_INIT_DUP; const char *end; const char *line = reader->line; /* * Ref lines have a number of fields which are space deliminated. The * first field is the OID of the ref. The second field is the ref * name. Subsequent fields (symref-target and peeled) are optional and * don't have a particular order. */ if (string_list_split(&line_sections, line, ' ', -1) < 2) { ret = 0; goto out; } if (!strcmp("unborn", line_sections.items[i].string)) { i++; if (unborn_head_target && !strcmp("HEAD", line_sections.items[i++].string)) { /* * Look for the symref target (if any). If found, * return it to the caller. */ for (; i < line_sections.nr; i++) { const char *arg = line_sections.items[i].string; if (skip_prefix(arg, "symref-target:", &arg)) { *unborn_head_target = xstrdup(arg); break; } } } goto out; } if (parse_oid_hex_algop(line_sections.items[i++].string, &old_oid, &end, reader->hash_algo) || *end) { ret = 0; goto out; } ref = alloc_ref(line_sections.items[i++].string); memcpy(ref->old_oid.hash, old_oid.hash, reader->hash_algo->rawsz); **list = ref; *list = &ref->next; for (; i < line_sections.nr; i++) { const char *arg = line_sections.items[i].string; if (skip_prefix(arg, "symref-target:", &arg)) ref->symref = xstrdup(arg); if (skip_prefix(arg, "peeled:", &arg)) { struct object_id peeled_oid; char *peeled_name; struct ref *peeled; if (parse_oid_hex_algop(arg, &peeled_oid, &end, reader->hash_algo) || *end) { ret = 0; goto out; } peeled_name = xstrfmt("%s^{}", ref->name); peeled = alloc_ref(peeled_name); memcpy(peeled->old_oid.hash, peeled_oid.hash, reader->hash_algo->rawsz); **list = peeled; *list = &peeled->next; free(peeled_name); } } out: string_list_clear(&line_sections, 0); return ret; } void check_stateless_delimiter(int stateless_rpc, struct packet_reader *reader, const char *error) { if (!stateless_rpc) return; /* not in stateless mode, no delimiter expected */ if (packet_reader_read(reader) != PACKET_READ_RESPONSE_END) die("%s", error); } struct ref **get_remote_refs(int fd_out, struct packet_reader *reader, struct ref **list, int for_push, struct transport_ls_refs_options *transport_options, const struct string_list *server_options, int stateless_rpc) { int i; const char *hash_name; struct strvec *ref_prefixes = transport_options ? &transport_options->ref_prefixes : NULL; char **unborn_head_target = transport_options ? &transport_options->unborn_head_target : NULL; *list = NULL; if (server_supports_v2("ls-refs", 1)) packet_write_fmt(fd_out, "command=ls-refs\n"); if (server_supports_v2("agent", 0)) packet_write_fmt(fd_out, "agent=%s", git_user_agent_sanitized()); if (server_feature_v2("object-format", &hash_name)) { int hash_algo = hash_algo_by_name(hash_name); if (hash_algo == GIT_HASH_UNKNOWN) die(_("unknown object format '%s' specified by server"), hash_name); reader->hash_algo = &hash_algos[hash_algo]; packet_write_fmt(fd_out, "object-format=%s", reader->hash_algo->name); } else { reader->hash_algo = &hash_algos[GIT_HASH_SHA1]; } if (server_options && server_options->nr && server_supports_v2("server-option", 1)) for (i = 0; i < server_options->nr; i++) packet_write_fmt(fd_out, "server-option=%s", server_options->items[i].string); packet_delim(fd_out); /* When pushing we don't want to request the peeled tags */ if (!for_push) packet_write_fmt(fd_out, "peel\n"); packet_write_fmt(fd_out, "symrefs\n"); if (server_supports_feature("ls-refs", "unborn", 0)) packet_write_fmt(fd_out, "unborn\n"); for (i = 0; ref_prefixes && i < ref_prefixes->nr; i++) { packet_write_fmt(fd_out, "ref-prefix %s\n", ref_prefixes->v[i]); } packet_flush(fd_out); /* Process response from server */ while (packet_reader_read(reader) == PACKET_READ_NORMAL) { if (!process_ref_v2(reader, &list, unborn_head_target)) die(_("invalid ls-refs response: %s"), reader->line); } if (reader->status != PACKET_READ_FLUSH) die(_("expected flush after ref listing")); check_stateless_delimiter(stateless_rpc, reader, _("expected response end packet after ref listing")); return list; } const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp, int *offset) { int len; if (!feature_list) return NULL; len = strlen(feature); if (offset) feature_list += *offset; while (*feature_list) { const char *found = strstr(feature_list, feature); if (!found) return NULL; if (feature_list == found || isspace(found[-1])) { const char *value = found + len; /* feature with no value (e.g., "thin-pack") */ if (!*value || isspace(*value)) { if (lenp) *lenp = 0; return value; } /* feature with a value (e.g., "agent=git/1.2.3") */ else if (*value == '=') { int end; value++; end = strcspn(value, " \t\n"); if (lenp) *lenp = end; if (offset) *offset = value + end - feature_list; return value; } /* * otherwise we matched a substring of another feature; * keep looking */ } feature_list = found + 1; } return NULL; } int server_supports_hash(const char *desired, int *feature_supported) { int offset = 0; int len; const char *hash; hash = next_server_feature_value("object-format", &len, &offset); if (feature_supported) *feature_supported = !!hash; if (!hash) { hash = hash_algos[GIT_HASH_SHA1].name; len = strlen(hash); } while (hash) { if (!xstrncmpz(desired, hash, len)) return 1; hash = next_server_feature_value("object-format", &len, &offset); } return 0; } int parse_feature_request(const char *feature_list, const char *feature) { return !!parse_feature_value(feature_list, feature, NULL, NULL); } static const char *next_server_feature_value(const char *feature, int *len, int *offset) { return parse_feature_value(server_capabilities_v1, feature, len, offset); } const char *server_feature_value(const char *feature, int *len) { return parse_feature_value(server_capabilities_v1, feature, len, NULL); } int server_supports(const char *feature) { return !!server_feature_value(feature, NULL); } enum protocol { PROTO_LOCAL = 1, PROTO_FILE, PROTO_SSH, PROTO_GIT }; int url_is_local_not_ssh(const char *url) { const char *colon = strchr(url, ':'); const char *slash = strchr(url, '/'); return !colon || (slash && slash < colon) || (has_dos_drive_prefix(url) && is_valid_path(url)); } static const char *prot_name(enum protocol protocol) { switch (protocol) { case PROTO_LOCAL: case PROTO_FILE: return "file"; case PROTO_SSH: return "ssh"; case PROTO_GIT: return "git"; default: return "unknown protocol"; } } static enum protocol get_protocol(const char *name) { if (!strcmp(name, "ssh")) return PROTO_SSH; if (!strcmp(name, "git")) return PROTO_GIT; if (!strcmp(name, "git+ssh")) /* deprecated - do not use */ return PROTO_SSH; if (!strcmp(name, "ssh+git")) /* deprecated - do not use */ return PROTO_SSH; if (!strcmp(name, "file")) return PROTO_FILE; die(_("protocol '%s' is not supported"), name); } static char *host_end(char **hoststart, int removebrackets) { char *host = *hoststart; char *end; char *start = strstr(host, "@["); if (start) start++; /* Jump over '@' */ else start = host; if (start[0] == '[') { end = strchr(start + 1, ']'); if (end) { if (removebrackets) { *end = 0; memmove(start, start + 1, end - start); end++; } } else end = host; } else end = host; return end; } #define STR_(s) # s #define STR(s) STR_(s) static void get_host_and_port(char **host, const char **port) { char *colon, *end; end = host_end(host, 1); colon = strchr(end, ':'); if (colon) { long portnr = strtol(colon + 1, &end, 10); if (end != colon + 1 && *end == '\0' && 0 <= portnr && portnr < 65536) { *colon = 0; *port = colon + 1; } else if (!colon[1]) { *colon = 0; } } } static void enable_keepalive(int sockfd) { int ka = 1; if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0) error_errno(_("unable to set SO_KEEPALIVE on socket")); } #ifndef NO_IPV6 static const char *ai_name(const struct addrinfo *ai) { static char addr[NI_MAXHOST]; if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0, NI_NUMERICHOST) != 0) xsnprintf(addr, sizeof(addr), "(unknown)"); return addr; } /* * Returns a connected socket() fd, or else die()s. */ static int git_tcp_connect_sock(char *host, int flags) { struct strbuf error_message = STRBUF_INIT; int sockfd = -1; const char *port = STR(DEFAULT_GIT_PORT); struct addrinfo hints, *ai0, *ai; int gai; int cnt = 0; get_host_and_port(&host, &port); if (!*port) port = "<none>"; memset(&hints, 0, sizeof(hints)); if (flags & CONNECT_IPV4) hints.ai_family = AF_INET; else if (flags & CONNECT_IPV6) hints.ai_family = AF_INET6; hints.ai_socktype = SOCK_STREAM; hints.ai_protocol = IPPROTO_TCP; if (flags & CONNECT_VERBOSE) fprintf(stderr, _("Looking up %s ... "), host); gai = getaddrinfo(host, port, &hints, &ai); if (gai) die(_("unable to look up %s (port %s) (%s)"), host, port, gai_strerror(gai)); if (flags & CONNECT_VERBOSE) /* TRANSLATORS: this is the end of "Looking up %s ... " */ fprintf(stderr, _("done.\nConnecting to %s (port %s) ... "), host, port); for (ai0 = ai; ai; ai = ai->ai_next, cnt++) { sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); if ((sockfd < 0) || (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) { strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n", host, cnt, ai_name(ai), strerror(errno)); if (0 <= sockfd) close(sockfd); sockfd = -1; continue; } if (flags & CONNECT_VERBOSE) fprintf(stderr, "%s ", ai_name(ai)); break; } freeaddrinfo(ai0); if (sockfd < 0) die(_("unable to connect to %s:\n%s"), host, error_message.buf); enable_keepalive(sockfd); if (flags & CONNECT_VERBOSE) /* TRANSLATORS: this is the end of "Connecting to %s (port %s) ... " */ fprintf_ln(stderr, _("done.")); strbuf_release(&error_message); return sockfd; } #else /* NO_IPV6 */ /* * Returns a connected socket() fd, or else die()s. */ static int git_tcp_connect_sock(char *host, int flags) { struct strbuf error_message = STRBUF_INIT; int sockfd = -1; const char *port = STR(DEFAULT_GIT_PORT); char *ep; struct hostent *he; struct sockaddr_in sa; char **ap; unsigned int nport; int cnt; get_host_and_port(&host, &port); if (flags & CONNECT_VERBOSE) fprintf(stderr, _("Looking up %s ... "), host); he = gethostbyname(host); if (!he) die(_("unable to look up %s (%s)"), host, hstrerror(h_errno)); nport = strtoul(port, &ep, 10); if ( ep == port || *ep ) { /* Not numeric */ struct servent *se = getservbyname(port,"tcp"); if ( !se ) die(_("unknown port %s"), port); nport = se->s_port; } if (flags & CONNECT_VERBOSE) /* TRANSLATORS: this is the end of "Looking up %s ... " */ fprintf(stderr, _("done.\nConnecting to %s (port %s) ... "), host, port); for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) { memset(&sa, 0, sizeof sa); sa.sin_family = he->h_addrtype; sa.sin_port = htons(nport); memcpy(&sa.sin_addr, *ap, he->h_length); sockfd = socket(he->h_addrtype, SOCK_STREAM, 0); if ((sockfd < 0) || connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) { strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n", host, cnt, inet_ntoa(*(struct in_addr *)&sa.sin_addr), strerror(errno)); if (0 <= sockfd) close(sockfd); sockfd = -1; continue; } if (flags & CONNECT_VERBOSE) fprintf(stderr, "%s ", inet_ntoa(*(struct in_addr *)&sa.sin_addr)); break; } if (sockfd < 0) die(_("unable to connect to %s:\n%s"), host, error_message.buf); enable_keepalive(sockfd); if (flags & CONNECT_VERBOSE) /* TRANSLATORS: this is the end of "Connecting to %s (port %s) ... " */ fprintf_ln(stderr, _("done.")); return sockfd; } #endif /* NO_IPV6 */ /* * Dummy child_process returned by git_connect() if the transport protocol * does not need fork(2). */ static struct child_process no_fork = CHILD_PROCESS_INIT; int git_connection_is_socket(struct child_process *conn) { return conn == &no_fork; } static struct child_process *git_tcp_connect(int fd[2], char *host, int flags) { int sockfd = git_tcp_connect_sock(host, flags); fd[0] = sockfd; fd[1] = dup(sockfd); return &no_fork; } static char *git_proxy_command; static int git_proxy_command_options(const char *var, const char *value, void *cb) { if (!strcmp(var, "core.gitproxy")) { const char *for_pos; int matchlen = -1; int hostlen; const char *rhost_name = cb; int rhost_len = strlen(rhost_name); if (git_proxy_command) return 0; if (!value) return config_error_nonbool(var); /* [core] * ;# matches www.kernel.org as well * gitproxy = netcatter-1 for kernel.org * gitproxy = netcatter-2 for sample.xz * gitproxy = netcatter-default */ for_pos = strstr(value, " for "); if (!for_pos) /* matches everybody */ matchlen = strlen(value); else { hostlen = strlen(for_pos + 5); if (rhost_len < hostlen) matchlen = -1; else if (!strncmp(for_pos + 5, rhost_name + rhost_len - hostlen, hostlen) && ((rhost_len == hostlen) || rhost_name[rhost_len - hostlen -1] == '.')) matchlen = for_pos - value; else matchlen = -1; } if (0 <= matchlen) { /* core.gitproxy = none for kernel.org */ if (matchlen == 4 && !memcmp(value, "none", 4)) matchlen = 0; git_proxy_command = xmemdupz(value, matchlen); } return 0; } return git_default_config(var, value, cb); } static int git_use_proxy(const char *host) { git_proxy_command = getenv("GIT_PROXY_COMMAND"); git_config(git_proxy_command_options, (void*)host); return (git_proxy_command && *git_proxy_command); } static struct child_process *git_proxy_connect(int fd[2], char *host) { const char *port = STR(DEFAULT_GIT_PORT); struct child_process *proxy; get_host_and_port(&host, &port); if (looks_like_command_line_option(host)) die(_("strange hostname '%s' blocked"), host); if (looks_like_command_line_option(port)) die(_("strange port '%s' blocked"), port); proxy = xmalloc(sizeof(*proxy)); child_process_init(proxy); strvec_push(&proxy->args, git_proxy_command); strvec_push(&proxy->args, host); strvec_push(&proxy->args, port); proxy->in = -1; proxy->out = -1; if (start_command(proxy)) die(_("cannot start proxy %s"), git_proxy_command); fd[0] = proxy->out; /* read from proxy stdout */ fd[1] = proxy->in; /* write to proxy stdin */ return proxy; } static char *get_port(char *host) { char *end; char *p = strchr(host, ':'); if (p) { long port = strtol(p + 1, &end, 10); if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) { *p = '\0'; return p+1; } } return NULL; } /* * Extract protocol and relevant parts from the specified connection URL. * The caller must free() the returned strings. */ static enum protocol parse_connect_url(const char *url_orig, char **ret_host, char **ret_path) { char *url; char *host, *path; char *end; int separator = '/'; enum protocol protocol = PROTO_LOCAL; if (is_url(url_orig)) url = url_decode(url_orig); else url = xstrdup(url_orig); host = strstr(url, "://"); if (host) { *host = '\0'; protocol = get_protocol(url); host += 3; } else { host = url; if (!url_is_local_not_ssh(url)) { protocol = PROTO_SSH; separator = ':'; } } /* * Don't do destructive transforms as protocol code does * '[]' unwrapping in get_host_and_port() */ end = host_end(&host, 0); if (protocol == PROTO_LOCAL) path = end; else if (protocol == PROTO_FILE && *host != '/' && !has_dos_drive_prefix(host) && offset_1st_component(host - 2) > 1) path = host - 2; /* include the leading "//" */ else if (protocol == PROTO_FILE && has_dos_drive_prefix(end)) path = end; /* "file://$(pwd)" may be "file://C:/projects/repo" */ else path = strchr(end, separator); if (!path || !*path) die(_("no path specified; see 'git help pull' for valid url syntax")); /* * null-terminate hostname and point path to ~ for URL's like this: * ssh://host.xz/~user/repo */ end = path; /* Need to \0 terminate host here */ if (separator == ':') path++; /* path starts after ':' */ if (protocol == PROTO_GIT || protocol == PROTO_SSH) { if (path[1] == '~') path++; } path = xstrdup(path); *end = '\0'; *ret_host = xstrdup(host); *ret_path = path; free(url); return protocol; } static const char *get_ssh_command(void) { const char *ssh; if ((ssh = getenv("GIT_SSH_COMMAND"))) return ssh; if (!git_config_get_string_tmp("core.sshcommand", &ssh)) return ssh; return NULL; } enum ssh_variant { VARIANT_AUTO, VARIANT_SIMPLE, VARIANT_SSH, VARIANT_PLINK, VARIANT_PUTTY, VARIANT_TORTOISEPLINK, }; static void override_ssh_variant(enum ssh_variant *ssh_variant) { const char *variant = getenv("GIT_SSH_VARIANT"); if (!variant && git_config_get_string_tmp("ssh.variant", &variant)) return; if (!strcmp(variant, "auto")) *ssh_variant = VARIANT_AUTO; else if (!strcmp(variant, "plink")) *ssh_variant = VARIANT_PLINK; else if (!strcmp(variant, "putty")) *ssh_variant = VARIANT_PUTTY; else if (!strcmp(variant, "tortoiseplink")) *ssh_variant = VARIANT_TORTOISEPLINK; else if (!strcmp(variant, "simple")) *ssh_variant = VARIANT_SIMPLE; else *ssh_variant = VARIANT_SSH; } static enum ssh_variant determine_ssh_variant(const char *ssh_command, int is_cmdline) { enum ssh_variant ssh_variant = VARIANT_AUTO; const char *variant; char *p = NULL; override_ssh_variant(&ssh_variant); if (ssh_variant != VARIANT_AUTO) return ssh_variant; if (!is_cmdline) { p = xstrdup(ssh_command); variant = basename(p); } else { const char **ssh_argv; p = xstrdup(ssh_command); if (split_cmdline(p, &ssh_argv) > 0) { variant = basename((char *)ssh_argv[0]); /* * At this point, variant points into the buffer * referenced by p, hence we do not need ssh_argv * any longer. */ free(ssh_argv); } else { free(p); return ssh_variant; } } if (!strcasecmp(variant, "ssh") || !strcasecmp(variant, "ssh.exe")) ssh_variant = VARIANT_SSH; else if (!strcasecmp(variant, "plink") || !strcasecmp(variant, "plink.exe")) ssh_variant = VARIANT_PLINK; else if (!strcasecmp(variant, "tortoiseplink") || !strcasecmp(variant, "tortoiseplink.exe")) ssh_variant = VARIANT_TORTOISEPLINK; free(p); return ssh_variant; } /* * Open a connection using Git's native protocol. * * The caller is responsible for freeing hostandport, but this function may * modify it (for example, to truncate it to remove the port part). */ static struct child_process *git_connect_git(int fd[2], char *hostandport, const char *path, const char *prog, enum protocol_version version, int flags) { struct child_process *conn; struct strbuf request = STRBUF_INIT; /* * Set up virtual host information based on where we will * connect, unless the user has overridden us in * the environment. */ char *target_host = getenv("GIT_OVERRIDE_VIRTUAL_HOST"); if (target_host) target_host = xstrdup(target_host); else target_host = xstrdup(hostandport); transport_check_allowed("git"); if (strchr(target_host, '\n') || strchr(path, '\n')) die(_("newline is forbidden in git:// hosts and repo paths")); /* * These underlying connection commands die() if they * cannot connect. */ if (git_use_proxy(hostandport)) conn = git_proxy_connect(fd, hostandport); else conn = git_tcp_connect(fd, hostandport, flags); /* * Separate original protocol components prog and path * from extended host header with a NUL byte. * * Note: Do not add any other headers here! Doing so * will cause older git-daemon servers to crash. */ strbuf_addf(&request, "%s %s%chost=%s%c", prog, path, 0, target_host, 0); /* If using a new version put that stuff here after a second null byte */ if (version > 0) { strbuf_addch(&request, '\0'); strbuf_addf(&request, "version=%d%c", version, '\0'); } packet_write(fd[1], request.buf, request.len); free(target_host); strbuf_release(&request); return conn; } /* * Append the appropriate environment variables to `env` and options to * `args` for running ssh in Git's SSH-tunneled transport. */ static void push_ssh_options(struct strvec *args, struct strvec *env, enum ssh_variant variant, const char *port, enum protocol_version version, int flags) { if (variant == VARIANT_SSH && version > 0) { strvec_push(args, "-o"); strvec_push(args, "SendEnv=" GIT_PROTOCOL_ENVIRONMENT); strvec_pushf(env, GIT_PROTOCOL_ENVIRONMENT "=version=%d", version); } if (flags & CONNECT_IPV4) { switch (variant) { case VARIANT_AUTO: BUG("VARIANT_AUTO passed to push_ssh_options"); case VARIANT_SIMPLE: die(_("ssh variant 'simple' does not support -4")); case VARIANT_SSH: case VARIANT_PLINK: case VARIANT_PUTTY: case VARIANT_TORTOISEPLINK: strvec_push(args, "-4"); } } else if (flags & CONNECT_IPV6) { switch (variant) { case VARIANT_AUTO: BUG("VARIANT_AUTO passed to push_ssh_options"); case VARIANT_SIMPLE: die(_("ssh variant 'simple' does not support -6")); case VARIANT_SSH: case VARIANT_PLINK: case VARIANT_PUTTY: case VARIANT_TORTOISEPLINK: strvec_push(args, "-6"); } } if (variant == VARIANT_TORTOISEPLINK) strvec_push(args, "-batch"); if (port) { switch (variant) { case VARIANT_AUTO: BUG("VARIANT_AUTO passed to push_ssh_options"); case VARIANT_SIMPLE: die(_("ssh variant 'simple' does not support setting port")); case VARIANT_SSH: strvec_push(args, "-p"); break; case VARIANT_PLINK: case VARIANT_PUTTY: case VARIANT_TORTOISEPLINK: strvec_push(args, "-P"); } strvec_push(args, port); } } /* Prepare a child_process for use by Git's SSH-tunneled transport. */ static void fill_ssh_args(struct child_process *conn, const char *ssh_host, const char *port, enum protocol_version version, int flags) { const char *ssh; enum ssh_variant variant; if (looks_like_command_line_option(ssh_host)) die(_("strange hostname '%s' blocked"), ssh_host); ssh = get_ssh_command(); if (ssh) { variant = determine_ssh_variant(ssh, 1); } else { /* * GIT_SSH is the no-shell version of * GIT_SSH_COMMAND (and must remain so for * historical compatibility). */ conn->use_shell = 0; ssh = getenv("GIT_SSH"); if (!ssh) ssh = "ssh"; variant = determine_ssh_variant(ssh, 0); } if (variant == VARIANT_AUTO) { struct child_process detect = CHILD_PROCESS_INIT; detect.use_shell = conn->use_shell; detect.no_stdin = detect.no_stdout = detect.no_stderr = 1; strvec_push(&detect.args, ssh); strvec_push(&detect.args, "-G"); push_ssh_options(&detect.args, &detect.env_array, VARIANT_SSH, port, version, flags); strvec_push(&detect.args, ssh_host); variant = run_command(&detect) ? VARIANT_SIMPLE : VARIANT_SSH; } strvec_push(&conn->args, ssh); push_ssh_options(&conn->args, &conn->env_array, variant, port, version, flags); strvec_push(&conn->args, ssh_host); } /* * This returns the dummy child_process `no_fork` if the transport protocol * does not need fork(2), or a struct child_process object if it does. Once * done, finish the connection with finish_connect() with the value returned * from this function (it is safe to call finish_connect() with NULL to * support the former case). * * If it returns, the connect is successful; it just dies on errors (this * will hopefully be changed in a libification effort, to return NULL when * the connection failed). */ struct child_process *git_connect(int fd[2], const char *url, const char *prog, int flags) { char *hostandport, *path; struct child_process *conn; enum protocol protocol; enum protocol_version version = get_protocol_version_config(); /* * NEEDSWORK: If we are trying to use protocol v2 and we are planning * to perform a push, then fallback to v0 since the client doesn't know * how to push yet using v2. */ if (version == protocol_v2 && !strcmp("git-receive-pack", prog)) version = protocol_v0; /* Without this we cannot rely on waitpid() to tell * what happened to our children. */ signal(SIGCHLD, SIG_DFL); protocol = parse_connect_url(url, &hostandport, &path); if ((flags & CONNECT_DIAG_URL) && (protocol != PROTO_SSH)) { printf("Diag: url=%s\n", url ? url : "NULL"); printf("Diag: protocol=%s\n", prot_name(protocol)); printf("Diag: hostandport=%s\n", hostandport ? hostandport : "NULL"); printf("Diag: path=%s\n", path ? path : "NULL"); conn = NULL; } else if (protocol == PROTO_GIT) { conn = git_connect_git(fd, hostandport, path, prog, version, flags); conn->trace2_child_class = "transport/git"; } else { struct strbuf cmd = STRBUF_INIT; const char *const *var; conn = xmalloc(sizeof(*conn)); child_process_init(conn); if (looks_like_command_line_option(path)) die(_("strange pathname '%s' blocked"), path); strbuf_addstr(&cmd, prog); strbuf_addch(&cmd, ' '); sq_quote_buf(&cmd, path); /* remove repo-local variables from the environment */ for (var = local_repo_env; *var; var++) strvec_push(&conn->env_array, *var); conn->use_shell = 1; conn->in = conn->out = -1; if (protocol == PROTO_SSH) { char *ssh_host = hostandport; const char *port = NULL; transport_check_allowed("ssh"); get_host_and_port(&ssh_host, &port); if (!port) port = get_port(ssh_host); if (flags & CONNECT_DIAG_URL) { printf("Diag: url=%s\n", url ? url : "NULL"); printf("Diag: protocol=%s\n", prot_name(protocol)); printf("Diag: userandhost=%s\n", ssh_host ? ssh_host : "NULL"); printf("Diag: port=%s\n", port ? port : "NONE"); printf("Diag: path=%s\n", path ? path : "NULL"); free(hostandport); free(path); free(conn); strbuf_release(&cmd); return NULL; } conn->trace2_child_class = "transport/ssh"; fill_ssh_args(conn, ssh_host, port, version, flags); } else { transport_check_allowed("file"); conn->trace2_child_class = "transport/file"; if (version > 0) { strvec_pushf(&conn->env_array, GIT_PROTOCOL_ENVIRONMENT "=version=%d", version); } } strvec_push(&conn->args, cmd.buf); if (start_command(conn)) die(_("unable to fork")); fd[0] = conn->out; /* read from child's stdout */ fd[1] = conn->in; /* write to child's stdin */ strbuf_release(&cmd); } free(hostandport); free(path); return conn; } int finish_connect(struct child_process *conn) { int code; if (!conn || git_connection_is_socket(conn)) return 0; code = finish_command(conn); free(conn); return code; }