| #include "cache.h" |
| #include "pkt-line.h" |
| #include "quote.h" |
| #include "refs.h" |
| #include <sys/wait.h> |
| #include <sys/socket.h> |
| #include <netinet/in.h> |
| #include <arpa/inet.h> |
| #include <netdb.h> |
| |
| static char *server_capabilities = NULL; |
| |
| /* |
| * Read all the refs from the other end |
| */ |
| struct ref **get_remote_heads(int in, struct ref **list, |
| int nr_match, char **match, int ignore_funny) |
| { |
| *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 < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ') |
| die("protocol error: expected sha/ref, got '%s'", buffer); |
| name = buffer + 41; |
| |
| if (ignore_funny && 45 < len && !memcmp(name, "refs/", 5) && |
| check_ref_format(name + 5)) |
| continue; |
| |
| name_len = strlen(name); |
| if (len != name_len + 41) { |
| if (server_capabilities) |
| free(server_capabilities); |
| server_capabilities = strdup(name + name_len + 1); |
| } |
| |
| if (nr_match && !path_match(name, nr_match, match)) |
| continue; |
| ref = xcalloc(1, sizeof(*ref) + len - 40); |
| memcpy(ref->old_sha1, old_sha1, 20); |
| memcpy(ref->name, buffer + 41, len - 40); |
| *list = ref; |
| list = &ref->next; |
| } |
| return list; |
| } |
| |
| int server_supports(const char *feature) |
| { |
| return server_capabilities && |
| strstr(server_capabilities, feature) != NULL; |
| } |
| |
| int get_ack(int fd, unsigned char *result_sha1) |
| { |
| static char line[1000]; |
| int len = packet_read_line(fd, line, sizeof(line)); |
| |
| if (!len) |
| die("git-fetch-pack: expected ACK/NAK, got EOF"); |
| if (line[len-1] == '\n') |
| line[--len] = 0; |
| if (!strcmp(line, "NAK")) |
| return 0; |
| if (!strncmp(line, "ACK ", 3)) { |
| if (!get_sha1_hex(line+4, result_sha1)) { |
| if (strstr(line+45, "continue")) |
| return 2; |
| return 1; |
| } |
| } |
| die("git-fetch_pack: expected ACK/NAK, got '%s'", line); |
| } |
| |
| 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 1; |
| } |
| return 0; |
| } |
| |
| struct refspec { |
| char *src; |
| char *dst; |
| char force; |
| }; |
| |
| /* |
| * A:B means fast forward remote B with local A. |
| * +A:B means overwrite remote B with local A. |
| * +A is a shorthand for +A:A. |
| * A is a shorthand for A:A. |
| */ |
| static struct refspec *parse_ref_spec(int nr_refspec, char **refspec) |
| { |
| int i; |
| struct refspec *rs = xcalloc(sizeof(*rs), (nr_refspec + 1)); |
| for (i = 0; i < nr_refspec; i++) { |
| char *sp, *dp, *ep; |
| sp = refspec[i]; |
| if (*sp == '+') { |
| rs[i].force = 1; |
| sp++; |
| } |
| ep = strchr(sp, ':'); |
| if (ep) { |
| dp = ep + 1; |
| *ep = 0; |
| } |
| else |
| dp = sp; |
| rs[i].src = sp; |
| rs[i].dst = dp; |
| } |
| rs[nr_refspec].src = rs[nr_refspec].dst = NULL; |
| return rs; |
| } |
| |
| static int count_refspec_match(const char *pattern, |
| struct ref *refs, |
| struct ref **matched_ref) |
| { |
| int match; |
| int patlen = strlen(pattern); |
| |
| for (match = 0; refs; refs = refs->next) { |
| char *name = refs->name; |
| int namelen = strlen(name); |
| if (namelen < patlen || |
| memcmp(name + namelen - patlen, pattern, patlen)) |
| continue; |
| if (namelen != patlen && name[namelen - patlen - 1] != '/') |
| continue; |
| match++; |
| *matched_ref = refs; |
| } |
| return match; |
| } |
| |
| static void link_dst_tail(struct ref *ref, struct ref ***tail) |
| { |
| **tail = ref; |
| *tail = &ref->next; |
| **tail = NULL; |
| } |
| |
| static struct ref *try_explicit_object_name(const char *name) |
| { |
| unsigned char sha1[20]; |
| struct ref *ref; |
| int len; |
| if (get_sha1(name, sha1)) |
| return NULL; |
| len = strlen(name) + 1; |
| ref = xcalloc(1, sizeof(*ref) + len); |
| memcpy(ref->name, name, len); |
| memcpy(ref->new_sha1, sha1, 20); |
| return ref; |
| } |
| |
| static int match_explicit_refs(struct ref *src, struct ref *dst, |
| struct ref ***dst_tail, struct refspec *rs) |
| { |
| int i, errs; |
| for (i = errs = 0; rs[i].src; i++) { |
| struct ref *matched_src, *matched_dst; |
| |
| matched_src = matched_dst = NULL; |
| switch (count_refspec_match(rs[i].src, src, &matched_src)) { |
| case 1: |
| break; |
| case 0: |
| /* The source could be in the get_sha1() format |
| * not a reference name. |
| */ |
| matched_src = try_explicit_object_name(rs[i].src); |
| if (matched_src) |
| break; |
| errs = 1; |
| error("src refspec %s does not match any.", |
| rs[i].src); |
| break; |
| default: |
| errs = 1; |
| error("src refspec %s matches more than one.", |
| rs[i].src); |
| break; |
| } |
| switch (count_refspec_match(rs[i].dst, dst, &matched_dst)) { |
| case 1: |
| break; |
| case 0: |
| if (!memcmp(rs[i].dst, "refs/", 5)) { |
| int len = strlen(rs[i].dst) + 1; |
| matched_dst = xcalloc(1, sizeof(*dst) + len); |
| memcpy(matched_dst->name, rs[i].dst, len); |
| link_dst_tail(matched_dst, dst_tail); |
| } |
| else if (!strcmp(rs[i].src, rs[i].dst) && |
| matched_src) { |
| /* pushing "master:master" when |
| * remote does not have master yet. |
| */ |
| int len = strlen(matched_src->name) + 1; |
| matched_dst = xcalloc(1, sizeof(*dst) + len); |
| memcpy(matched_dst->name, matched_src->name, |
| len); |
| link_dst_tail(matched_dst, dst_tail); |
| } |
| else { |
| errs = 1; |
| error("dst refspec %s does not match any " |
| "existing ref on the remote and does " |
| "not start with refs/.", rs[i].dst); |
| } |
| break; |
| default: |
| errs = 1; |
| error("dst refspec %s matches more than one.", |
| rs[i].dst); |
| break; |
| } |
| if (errs) |
| continue; |
| if (matched_dst->peer_ref) { |
| errs = 1; |
| error("dst ref %s receives from more than one src.", |
| matched_dst->name); |
| } |
| else { |
| matched_dst->peer_ref = matched_src; |
| matched_dst->force = rs[i].force; |
| } |
| } |
| return -errs; |
| } |
| |
| static struct ref *find_ref_by_name(struct ref *list, const char *name) |
| { |
| for ( ; list; list = list->next) |
| if (!strcmp(list->name, name)) |
| return list; |
| return NULL; |
| } |
| |
| int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail, |
| int nr_refspec, char **refspec, int all) |
| { |
| struct refspec *rs = parse_ref_spec(nr_refspec, refspec); |
| |
| if (nr_refspec) |
| return match_explicit_refs(src, dst, dst_tail, rs); |
| |
| /* pick the remainder */ |
| for ( ; src; src = src->next) { |
| struct ref *dst_peer; |
| if (src->peer_ref) |
| continue; |
| dst_peer = find_ref_by_name(dst, src->name); |
| if ((dst_peer && dst_peer->peer_ref) || (!dst_peer && !all)) |
| continue; |
| if (!dst_peer) { |
| /* Create a new one and link it */ |
| int len = strlen(src->name) + 1; |
| dst_peer = xcalloc(1, sizeof(*dst_peer) + len); |
| memcpy(dst_peer->name, src->name, len); |
| memcpy(dst_peer->new_sha1, src->new_sha1, 20); |
| link_dst_tail(dst_peer, dst_tail); |
| } |
| dst_peer->peer_ref = src; |
| } |
| 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; |
| die("I don't handle protocol '%s'", name); |
| } |
| |
| #define STR_(s) # s |
| #define STR(s) STR_(s) |
| |
| #ifndef NO_IPV6 |
| |
| static int git_tcp_connect(int fd[2], const char *prog, char *host, char *path) |
| { |
| int sockfd = -1; |
| char *colon, *end; |
| char *port = STR(DEFAULT_GIT_PORT); |
| struct addrinfo hints, *ai0, *ai; |
| int gai; |
| |
| 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; |
| } |
| |
| memset(&hints, 0, sizeof(hints)); |
| hints.ai_socktype = SOCK_STREAM; |
| hints.ai_protocol = IPPROTO_TCP; |
| |
| gai = getaddrinfo(host, port, &hints, &ai); |
| if (gai) |
| die("Unable to look up %s (%s)", host, gai_strerror(gai)); |
| |
| for (ai0 = ai; ai; ai = ai->ai_next) { |
| sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
| if (sockfd < 0) |
| continue; |
| if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) { |
| close(sockfd); |
| sockfd = -1; |
| continue; |
| } |
| break; |
| } |
| |
| freeaddrinfo(ai0); |
| |
| if (sockfd < 0) |
| die("unable to connect a socket (%s)", strerror(errno)); |
| |
| fd[0] = sockfd; |
| fd[1] = sockfd; |
| packet_write(sockfd, "%s %s\n", prog, path); |
| return 0; |
| } |
| |
| #else /* NO_IPV6 */ |
| |
| static int git_tcp_connect(int fd[2], const char *prog, char *host, char *path) |
| { |
| int sockfd = -1; |
| char *colon, *end; |
| char *port = STR(DEFAULT_GIT_PORT), *ep; |
| struct hostent *he; |
| struct sockaddr_in sa; |
| char **ap; |
| unsigned int nport; |
| |
| 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; |
| } |
| |
| |
| 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\n", port); |
| nport = se->s_port; |
| } |
| |
| for (ap = he->h_addr_list; *ap; ap++) { |
| sockfd = socket(he->h_addrtype, SOCK_STREAM, 0); |
| if (sockfd < 0) |
| 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) { |
| close(sockfd); |
| sockfd = -1; |
| continue; |
| } |
| break; |
| } |
| |
| if (sockfd < 0) |
| die("unable to connect a socket (%s)", strerror(errno)); |
| |
| fd[0] = sockfd; |
| fd[1] = sockfd; |
| packet_write(sockfd, "%s %s\n", prog, path); |
| return 0; |
| } |
| |
| #endif /* NO_IPV6 */ |
| |
| static char *git_proxy_command = NULL; |
| static const char *rhost_name = NULL; |
| static int rhost_len; |
| |
| static int git_proxy_command_options(const char *var, const char *value) |
| { |
| if (!strcmp(var, "core.gitproxy")) { |
| const char *for_pos; |
| int matchlen = -1; |
| int hostlen; |
| |
| if (git_proxy_command) |
| return 0; |
| /* [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 = xmalloc(matchlen + 1); |
| memcpy(git_proxy_command, value, matchlen); |
| git_proxy_command[matchlen] = 0; |
| } |
| return 0; |
| } |
| |
| return git_default_config(var, value); |
| } |
| |
| static int git_use_proxy(const char *host) |
| { |
| rhost_name = host; |
| rhost_len = strlen(host); |
| git_proxy_command = getenv("GIT_PROXY_COMMAND"); |
| git_config(git_proxy_command_options); |
| rhost_name = NULL; |
| return (git_proxy_command && *git_proxy_command); |
| } |
| |
| static int git_proxy_connect(int fd[2], const char *prog, char *host, char *path) |
| { |
| char *port = STR(DEFAULT_GIT_PORT); |
| char *colon, *end; |
| int pipefd[2][2]; |
| pid_t pid; |
| |
| 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; |
| } |
| |
| if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0) |
| die("unable to create pipe pair for communication"); |
| pid = fork(); |
| if (!pid) { |
| dup2(pipefd[1][0], 0); |
| dup2(pipefd[0][1], 1); |
| close(pipefd[0][0]); |
| close(pipefd[0][1]); |
| close(pipefd[1][0]); |
| close(pipefd[1][1]); |
| execlp(git_proxy_command, git_proxy_command, host, port, NULL); |
| die("exec failed"); |
| } |
| fd[0] = pipefd[0][0]; |
| fd[1] = pipefd[1][1]; |
| close(pipefd[0][1]); |
| close(pipefd[1][0]); |
| packet_write(fd[1], "%s %s\n", prog, path); |
| return pid; |
| } |
| |
| /* |
| * Yeah, yeah, fixme. Need to pass in the heads etc. |
| */ |
| int git_connect(int fd[2], char *url, const char *prog) |
| { |
| char command[1024]; |
| char *host, *path = url; |
| char *colon = NULL; |
| int pipefd[2][2]; |
| pid_t pid; |
| enum protocol protocol = PROTO_LOCAL; |
| |
| host = strstr(url, "://"); |
| if(host) { |
| *host = '\0'; |
| protocol = get_protocol(url); |
| host += 3; |
| path = strchr(host, '/'); |
| } |
| else { |
| host = url; |
| if ((colon = strchr(host, ':'))) { |
| protocol = PROTO_SSH; |
| *colon = '\0'; |
| path = colon + 1; |
| } |
| } |
| |
| 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 = strdup(ptr); |
| |
| *ptr = '\0'; |
| } |
| |
| if (protocol == PROTO_GIT) { |
| if (git_use_proxy(host)) |
| return git_proxy_connect(fd, prog, host, path); |
| return git_tcp_connect(fd, prog, host, path); |
| } |
| |
| if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0) |
| die("unable to create pipe pair for communication"); |
| pid = fork(); |
| if (!pid) { |
| snprintf(command, sizeof(command), "%s %s", prog, |
| sq_quote(path)); |
| dup2(pipefd[1][0], 0); |
| dup2(pipefd[0][1], 1); |
| close(pipefd[0][0]); |
| close(pipefd[0][1]); |
| close(pipefd[1][0]); |
| close(pipefd[1][1]); |
| if (protocol == PROTO_SSH) { |
| const char *ssh, *ssh_basename; |
| ssh = getenv("GIT_SSH"); |
| if (!ssh) ssh = "ssh"; |
| ssh_basename = strrchr(ssh, '/'); |
| if (!ssh_basename) |
| ssh_basename = ssh; |
| else |
| ssh_basename++; |
| execlp(ssh, ssh_basename, host, command, NULL); |
| } |
| else |
| execlp("sh", "sh", "-c", command, NULL); |
| die("exec failed"); |
| } |
| fd[0] = pipefd[0][0]; |
| fd[1] = pipefd[1][1]; |
| close(pipefd[0][1]); |
| close(pipefd[1][0]); |
| return pid; |
| } |
| |
| int finish_connect(pid_t pid) |
| { |
| int ret; |
| |
| for (;;) { |
| ret = waitpid(pid, NULL, 0); |
| if (!ret) |
| break; |
| if (errno != EINTR) |
| break; |
| } |
| return ret; |
| } |