| #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 "url.h" |
| |
| static char *server_capabilities; |
| |
| static int check_ref(const char *name, int len, unsigned int flags) |
| { |
| if (!flags) |
| return 1; |
| |
| if (len < 5 || memcmp(name, "refs/", 5)) |
| return 0; |
| |
| /* Skip the "refs/" part */ |
| name += 5; |
| len -= 5; |
| |
| /* REF_NORMAL means that we don't want the magic fake tag refs */ |
| if ((flags & REF_NORMAL) && check_ref_format(name) < 0) |
| return 0; |
| |
| /* REF_HEADS means that we want regular branch heads */ |
| if ((flags & REF_HEADS) && !memcmp(name, "heads/", 6)) |
| return 1; |
| |
| /* REF_TAGS means that we want tags */ |
| if ((flags & REF_TAGS) && !memcmp(name, "tags/", 5)) |
| 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, strlen(ref->name), flags); |
| } |
| |
| static void add_extra_have(struct extra_have_objects *extra, unsigned char *sha1) |
| { |
| ALLOC_GROW(extra->array, extra->nr + 1, extra->alloc); |
| hashcpy(&(extra->array[extra->nr][0]), sha1); |
| extra->nr++; |
| } |
| |
| /* |
| * Read all the refs from the other end |
| */ |
| struct ref **get_remote_heads(int in, struct ref **list, |
| int nr_match, char **match, |
| unsigned int flags, |
| struct extra_have_objects *extra_have) |
| { |
| *list = NULL; |
| for (;;) { |
| struct ref *ref; |
| unsigned char old_sha1[20]; |
| static char buffer[1000]; |
| char *name; |
| int len, name_len; |
| |
| len = packet_read_line(in, buffer, sizeof(buffer)); |
| if (!len) |
| break; |
| if (buffer[len-1] == '\n') |
| buffer[--len] = 0; |
| |
| if (len > 4 && !prefixcmp(buffer, "ERR ")) |
| die("remote error: %s", buffer + 4); |
| |
| 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 && |
| name_len == 5 && !memcmp(".have", name, 5)) { |
| add_extra_have(extra_have, old_sha1); |
| continue; |
| } |
| |
| if (!check_ref(name, name_len, flags)) |
| continue; |
| if (nr_match && !path_match(name, nr_match, match)) |
| continue; |
| ref = alloc_ref(buffer + 41); |
| hashcpy(ref->old_sha1, old_sha1); |
| *list = ref; |
| list = &ref->next; |
| } |
| return list; |
| } |
| |
| int server_supports(const char *feature) |
| { |
| return server_capabilities && |
| strstr(server_capabilities, feature) != NULL; |
| } |
| |
| int path_match(const char *path, int nr, char **match) |
| { |
| int i; |
| int pathlen = strlen(path); |
| |
| for (i = 0; i < nr; i++) { |
| char *s = match[i]; |
| int len = strlen(s); |
| |
| if (!len || len > pathlen) |
| continue; |
| if (memcmp(path + pathlen - len, s, len)) |
| continue; |
| if (pathlen > len && path[pathlen - len - 1] != '/') |
| continue; |
| *s = 0; |
| return (i + 1); |
| } |
| return 0; |
| } |
| |
| enum protocol { |
| PROTO_LOCAL = 1, |
| PROTO_SSH, |
| PROTO_GIT |
| }; |
| |
| 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_LOCAL; |
| die("I don't handle protocol '%s'", name); |
| } |
| |
| #define STR_(s) # s |
| #define STR(s) STR_(s) |
| |
| static void get_host_and_port(char **host, const char **port) |
| { |
| char *colon, *end; |
| |
| if (*host[0] == '[') { |
| end = strchr(*host + 1, ']'); |
| if (end) { |
| *end = 0; |
| end++; |
| (*host)++; |
| } else |
| end = *host; |
| } else |
| end = *host; |
| colon = strchr(end, ':'); |
| |
| if (colon) { |
| *colon = 0; |
| *port = colon + 1; |
| } |
| } |
| |
| #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) |
| { |
| int sockfd = -1, saved_errno = 0; |
| 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) { |
| saved_errno = errno; |
| continue; |
| } |
| if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) { |
| saved_errno = errno; |
| fprintf(stderr, "%s[%d: %s]: errno=%s\n", |
| host, |
| cnt, |
| ai_name(ai), |
| strerror(saved_errno)); |
| 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 a socket (%s)", strerror(saved_errno)); |
| |
| if (flags & CONNECT_VERBOSE) |
| fprintf(stderr, "done.\n"); |
| |
| return sockfd; |
| } |
| |
| #else /* NO_IPV6 */ |
| |
| /* |
| * Returns a connected socket() fd, or else die()s. |
| */ |
| static int git_tcp_connect_sock(char *host, int flags) |
| { |
| int sockfd = -1, saved_errno = 0; |
| 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++) { |
| sockfd = socket(he->h_addrtype, SOCK_STREAM, 0); |
| if (sockfd < 0) { |
| saved_errno = errno; |
| continue; |
| } |
| |
| memset(&sa, 0, sizeof sa); |
| sa.sin_family = he->h_addrtype; |
| sa.sin_port = htons(nport); |
| memcpy(&sa.sin_addr, *ap, he->h_length); |
| |
| if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) { |
| saved_errno = errno; |
| fprintf(stderr, "%s[%d: %s]: errno=%s\n", |
| host, |
| cnt, |
| inet_ntoa(*(struct in_addr *)&sa.sin_addr), |
| strerror(saved_errno)); |
| 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 a socket (%s)", strerror(saved_errno)); |
| |
| 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); |
| const char **argv; |
| struct child_process *proxy; |
| |
| get_host_and_port(&host, &port); |
| |
| argv = xmalloc(sizeof(*argv) * 4); |
| argv[0] = git_proxy_command; |
| argv[1] = host; |
| argv[2] = port; |
| argv[3] = NULL; |
| proxy = xcalloc(1, sizeof(*proxy)); |
| proxy->argv = argv; |
| proxy->in = -1; |
| proxy->out = -1; |
| if (start_command(proxy)) |
| die("cannot start proxy %s", argv[0]); |
| fd[0] = proxy->out; /* read from proxy stdout */ |
| fd[1] = proxy->in; /* write to proxy stdin */ |
| return proxy; |
| } |
| |
| #define MAX_CMD_LEN 1024 |
| |
| 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; |
| } |
| |
| static struct child_process no_fork; |
| |
| /* |
| * 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_orig, |
| const char *prog, int flags) |
| { |
| char *url; |
| char *host, *path; |
| char *end; |
| int c; |
| struct child_process *conn = &no_fork; |
| enum protocol protocol = PROTO_LOCAL; |
| int free_path = 0; |
| char *port = NULL; |
| const char **arg; |
| struct strbuf cmd; |
| |
| /* Without this we cannot rely on waitpid() to tell |
| * what happened to our children. |
| */ |
| signal(SIGCHLD, SIG_DFL); |
| |
| 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; |
| c = '/'; |
| } else { |
| host = url; |
| c = ':'; |
| } |
| |
| /* |
| * Don't do destructive transforms with git:// as that |
| * protocol code does '[]' unwrapping of its own. |
| */ |
| if (host[0] == '[') { |
| end = strchr(host + 1, ']'); |
| if (end) { |
| if (protocol != PROTO_GIT) { |
| *end = 0; |
| host++; |
| } |
| end++; |
| } else |
| end = host; |
| } else |
| end = host; |
| |
| path = strchr(end, c); |
| if (path && !has_dos_drive_prefix(end)) { |
| if (c == ':') { |
| protocol = PROTO_SSH; |
| *path++ = '\0'; |
| } |
| } else |
| path = end; |
| |
| 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 |
| */ |
| if (protocol != PROTO_LOCAL && host != url) { |
| char *ptr = path; |
| if (path[1] == '~') |
| path++; |
| else { |
| path = xstrdup(ptr); |
| free_path = 1; |
| } |
| |
| *ptr = '\0'; |
| } |
| |
| /* |
| * Add support for ssh port: ssh://host.xy:<port>/... |
| */ |
| if (protocol == PROTO_SSH && host != url) |
| port = get_port(host); |
| |
| if (protocol == PROTO_GIT) { |
| /* These underlying connection commands die() if they |
| * cannot connect. |
| */ |
| char *target_host = xstrdup(host); |
| if (git_use_proxy(host)) |
| conn = git_proxy_connect(fd, host); |
| else |
| git_tcp_connect(fd, host, 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); |
| free(url); |
| if (free_path) |
| free(path); |
| return conn; |
| } |
| |
| conn = xcalloc(1, sizeof(*conn)); |
| |
| strbuf_init(&cmd, MAX_CMD_LEN); |
| strbuf_addstr(&cmd, prog); |
| strbuf_addch(&cmd, ' '); |
| sq_quote_buf(&cmd, path); |
| if (cmd.len >= MAX_CMD_LEN) |
| die("command line too long"); |
| |
| conn->in = conn->out = -1; |
| conn->argv = arg = xcalloc(7, sizeof(*arg)); |
| if (protocol == PROTO_SSH) { |
| const char *ssh = getenv("GIT_SSH"); |
| int putty = ssh && strcasestr(ssh, "plink"); |
| if (!ssh) ssh = "ssh"; |
| |
| *arg++ = ssh; |
| if (putty && !strcasestr(ssh, "tortoiseplink")) |
| *arg++ = "-batch"; |
| if (port) { |
| /* P is for PuTTY, p is for OpenSSH */ |
| *arg++ = putty ? "-P" : "-p"; |
| *arg++ = port; |
| } |
| *arg++ = host; |
| } |
| else { |
| /* remove repo-local variables from the environment */ |
| conn->env = local_repo_env; |
| conn->use_shell = 1; |
| } |
| *arg++ = cmd.buf; |
| *arg = NULL; |
| |
| 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(url); |
| if (free_path) |
| 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->argv); |
| free(conn); |
| return code; |
| } |
| |
| char *git_getpass(const char *prompt) |
| { |
| const char *askpass; |
| struct child_process pass; |
| const char *args[3]; |
| static struct strbuf buffer = STRBUF_INIT; |
| |
| askpass = getenv("GIT_ASKPASS"); |
| if (!askpass) |
| askpass = askpass_program; |
| if (!askpass) |
| askpass = getenv("SSH_ASKPASS"); |
| if (!askpass || !(*askpass)) { |
| char *result = getpass(prompt); |
| if (!result) |
| die_errno("Could not read password"); |
| return result; |
| } |
| |
| args[0] = askpass; |
| args[1] = prompt; |
| args[2] = NULL; |
| |
| memset(&pass, 0, sizeof(pass)); |
| pass.argv = args; |
| pass.out = -1; |
| |
| if (start_command(&pass)) |
| exit(1); |
| |
| strbuf_reset(&buffer); |
| if (strbuf_read(&buffer, pass.out, 20) < 0) |
| die("failed to read password from %s\n", askpass); |
| |
| close(pass.out); |
| |
| if (finish_command(&pass)) |
| exit(1); |
| |
| strbuf_setlen(&buffer, strcspn(buffer.buf, "\r\n")); |
| |
| return buffer.buf; |
| } |