#include "git-compat-util.h" #include "cache.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 "sha1-array.h" static char *server_capabilities; static const char *parse_feature_value(const char *, const char *, int *); 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 void die_initial_contact(int got_at_least_one_head) { if (got_at_least_one_head) 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."); } 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(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; const char *feature_list = server_capabilities; while (feature_list) { int len; const char *val; val = parse_feature_value(feature_list, "symref", &len); if (!val) break; parse_one_symref_info(&symref, val, len); feature_list = val + 1; } 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); } /* * Read all the refs from the other end */ struct ref **get_remote_heads(int in, char *src_buf, size_t src_len, struct ref **list, unsigned int flags, struct sha1_array *extra_have, struct sha1_array *shallow_points) { struct ref **orig_list = list; int got_at_least_one_head = 0; *list = NULL; for (;;) { struct ref *ref; unsigned char old_sha1[20]; char *name; int len, name_len; char *buffer = packet_buffer; const char *arg; len = packet_read(in, &src_buf, &src_len, packet_buffer, sizeof(packet_buffer), PACKET_READ_GENTLE_ON_EOF | PACKET_READ_CHOMP_NEWLINE); if (len < 0) die_initial_contact(got_at_least_one_head); if (!len) break; if (len > 4 && skip_prefix(buffer, "ERR ", &arg)) die("remote error: %s", arg); if (len == 48 && skip_prefix(buffer, "shallow ", &arg)) { if (get_sha1_hex(arg, old_sha1)) die("protocol error: expected shallow sha-1, got '%s'", arg); if (!shallow_points) die("repository on the other end cannot be shallow"); sha1_array_append(shallow_points, old_sha1); continue; } if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ') die("protocol error: expected sha/ref, got '%s'", buffer); name = buffer + 41; name_len = strlen(name); if (len != name_len + 41) { free(server_capabilities); server_capabilities = xstrdup(name + name_len + 1); } if (extra_have && !strcmp(name, ".have")) { sha1_array_append(extra_have, old_sha1); continue; } if (!check_ref(name, flags)) continue; ref = alloc_ref(buffer + 41); hashcpy(ref->old_sha1, old_sha1); *list = ref; list = &ref->next; got_at_least_one_head = 1; } annotate_refs_with_symref_info(*orig_list); return list; } static const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp) { int len; if (!feature_list) return NULL; len = strlen(feature); 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 == '=') { value++; if (lenp) *lenp = strcspn(value, " \t\n"); return value; } /* * otherwise we matched a substring of another feature; * keep looking */ } feature_list = found + 1; } return NULL; } int parse_feature_request(const char *feature_list, const char *feature) { return !!parse_feature_value(feature_list, feature, NULL); } const char *server_feature_value(const char *feature, int *len) { return parse_feature_value(server_capabilities, feature, len); } 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); } 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 "unkown 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")) return PROTO_SSH; if (!strcmp(name, "ssh+git")) return PROTO_SSH; if (!strcmp(name, "file")) return PROTO_FILE; die("I don't handle protocol '%s'", 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) fprintf(stderr, "unable to set SO_KEEPALIVE on socket: %s\n", strerror(errno)); } #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) strcpy(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)); 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) 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) fprintf(stderr, "done.\n"); 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) 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) fprintf(stderr, "done.\n"); return sockfd; } #endif /* NO_IPV6 */ static void 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); } 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); proxy = xmalloc(sizeof(*proxy)); child_process_init(proxy); argv_array_push(&proxy->args, git_proxy_command); argv_array_push(&proxy->args, host); argv_array_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 && 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 'man git-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 struct child_process no_fork = CHILD_PROCESS_INIT; /* * This returns a dummy child_process 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 = &no_fork; enum protocol protocol; struct strbuf cmd = STRBUF_INIT; /* 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) { /* * 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); /* These underlying connection commands die() if they * cannot connect. */ if (git_use_proxy(hostandport)) conn = git_proxy_connect(fd, hostandport); else 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. */ packet_write(fd[1], "%s %s%chost=%s%c", prog, path, 0, target_host, 0); free(target_host); } else { conn = xmalloc(sizeof(*conn)); child_process_init(conn); strbuf_addstr(&cmd, prog); strbuf_addch(&cmd, ' '); sq_quote_buf(&cmd, path); conn->in = conn->out = -1; if (protocol == PROTO_SSH) { const char *ssh; int putty, tortoiseplink = 0; char *ssh_host = hostandport; const char *port = NULL; 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); return NULL; } ssh = getenv("GIT_SSH_COMMAND"); if (ssh) { conn->use_shell = 1; putty = 0; } else { const char *base; char *ssh_dup; ssh = getenv("GIT_SSH"); if (!ssh) ssh = "ssh"; ssh_dup = xstrdup(ssh); base = basename(ssh_dup); tortoiseplink = !strcasecmp(base, "tortoiseplink") || !strcasecmp(base, "tortoiseplink.exe"); putty = !strcasecmp(base, "plink") || !strcasecmp(base, "plink.exe") || tortoiseplink; free(ssh_dup); } argv_array_push(&conn->args, ssh); if (tortoiseplink) argv_array_push(&conn->args, "-batch"); if (port) { /* P is for PuTTY, p is for OpenSSH */ argv_array_push(&conn->args, putty ? "-P" : "-p"); argv_array_push(&conn->args, port); } argv_array_push(&conn->args, ssh_host); } else { /* remove repo-local variables from the environment */ conn->env = local_repo_env; conn->use_shell = 1; } argv_array_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 git_connection_is_socket(struct child_process *conn) { return conn == &no_fork; } 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; }