Jeff King | e277097 | 2011-12-10 05:34:14 -0500 | [diff] [blame] | 1 | #include "cache.h" |
| 2 | #include "unix-socket.h" |
| 3 | |
| 4 | static int unix_stream_socket(void) |
| 5 | { |
| 6 | int fd = socket(AF_UNIX, SOCK_STREAM, 0); |
| 7 | if (fd < 0) |
| 8 | die_errno("unable to create socket"); |
| 9 | return fd; |
| 10 | } |
| 11 | |
Jeff King | 1eb10f4 | 2012-01-09 23:44:30 -0500 | [diff] [blame] | 12 | static int chdir_len(const char *orig, int len) |
| 13 | { |
| 14 | char *path = xmemdupz(orig, len); |
| 15 | int r = chdir(path); |
| 16 | free(path); |
| 17 | return r; |
| 18 | } |
| 19 | |
| 20 | struct unix_sockaddr_context { |
René Scharfe | d13a0a9 | 2014-07-28 20:25:40 +0200 | [diff] [blame] | 21 | char *orig_dir; |
Jeff King | 1eb10f4 | 2012-01-09 23:44:30 -0500 | [diff] [blame] | 22 | }; |
| 23 | |
| 24 | static void unix_sockaddr_cleanup(struct unix_sockaddr_context *ctx) |
| 25 | { |
René Scharfe | d13a0a9 | 2014-07-28 20:25:40 +0200 | [diff] [blame] | 26 | if (!ctx->orig_dir) |
Jeff King | 1eb10f4 | 2012-01-09 23:44:30 -0500 | [diff] [blame] | 27 | return; |
| 28 | /* |
| 29 | * If we fail, we can't just return an error, since we have |
| 30 | * moved the cwd of the whole process, which could confuse calling |
| 31 | * code. We are better off to just die. |
| 32 | */ |
| 33 | if (chdir(ctx->orig_dir) < 0) |
| 34 | die("unable to restore original working directory"); |
René Scharfe | d13a0a9 | 2014-07-28 20:25:40 +0200 | [diff] [blame] | 35 | free(ctx->orig_dir); |
Jeff King | 1eb10f4 | 2012-01-09 23:44:30 -0500 | [diff] [blame] | 36 | } |
| 37 | |
| 38 | static int unix_sockaddr_init(struct sockaddr_un *sa, const char *path, |
| 39 | struct unix_sockaddr_context *ctx) |
Jeff King | e277097 | 2011-12-10 05:34:14 -0500 | [diff] [blame] | 40 | { |
| 41 | int size = strlen(path) + 1; |
Jeff King | 1eb10f4 | 2012-01-09 23:44:30 -0500 | [diff] [blame] | 42 | |
René Scharfe | d13a0a9 | 2014-07-28 20:25:40 +0200 | [diff] [blame] | 43 | ctx->orig_dir = NULL; |
Jeff King | 1eb10f4 | 2012-01-09 23:44:30 -0500 | [diff] [blame] | 44 | if (size > sizeof(sa->sun_path)) { |
| 45 | const char *slash = find_last_dir_sep(path); |
| 46 | const char *dir; |
René Scharfe | d13a0a9 | 2014-07-28 20:25:40 +0200 | [diff] [blame] | 47 | struct strbuf cwd = STRBUF_INIT; |
Jeff King | 1eb10f4 | 2012-01-09 23:44:30 -0500 | [diff] [blame] | 48 | |
| 49 | if (!slash) { |
| 50 | errno = ENAMETOOLONG; |
| 51 | return -1; |
| 52 | } |
| 53 | |
| 54 | dir = path; |
| 55 | path = slash + 1; |
| 56 | size = strlen(path) + 1; |
| 57 | if (size > sizeof(sa->sun_path)) { |
| 58 | errno = ENAMETOOLONG; |
| 59 | return -1; |
| 60 | } |
René Scharfe | d13a0a9 | 2014-07-28 20:25:40 +0200 | [diff] [blame] | 61 | if (strbuf_getcwd(&cwd)) |
Jeff King | 1eb10f4 | 2012-01-09 23:44:30 -0500 | [diff] [blame] | 62 | return -1; |
René Scharfe | d13a0a9 | 2014-07-28 20:25:40 +0200 | [diff] [blame] | 63 | ctx->orig_dir = strbuf_detach(&cwd, NULL); |
Jeff King | 1eb10f4 | 2012-01-09 23:44:30 -0500 | [diff] [blame] | 64 | if (chdir_len(dir, slash - dir) < 0) |
| 65 | return -1; |
| 66 | } |
| 67 | |
Jeff King | e277097 | 2011-12-10 05:34:14 -0500 | [diff] [blame] | 68 | memset(sa, 0, sizeof(*sa)); |
| 69 | sa->sun_family = AF_UNIX; |
| 70 | memcpy(sa->sun_path, path, size); |
Jeff King | 1eb10f4 | 2012-01-09 23:44:30 -0500 | [diff] [blame] | 71 | return 0; |
Jeff King | e277097 | 2011-12-10 05:34:14 -0500 | [diff] [blame] | 72 | } |
| 73 | |
| 74 | int unix_stream_connect(const char *path) |
| 75 | { |
Jonathan Nieder | 06121a0 | 2012-01-11 17:50:10 -0600 | [diff] [blame] | 76 | int fd, saved_errno; |
Jeff King | e277097 | 2011-12-10 05:34:14 -0500 | [diff] [blame] | 77 | struct sockaddr_un sa; |
Jeff King | 1eb10f4 | 2012-01-09 23:44:30 -0500 | [diff] [blame] | 78 | struct unix_sockaddr_context ctx; |
Jeff King | e277097 | 2011-12-10 05:34:14 -0500 | [diff] [blame] | 79 | |
Jeff King | 1eb10f4 | 2012-01-09 23:44:30 -0500 | [diff] [blame] | 80 | if (unix_sockaddr_init(&sa, path, &ctx) < 0) |
| 81 | return -1; |
Jeff King | e277097 | 2011-12-10 05:34:14 -0500 | [diff] [blame] | 82 | fd = unix_stream_socket(); |
Jonathan Nieder | 06121a0 | 2012-01-11 17:50:10 -0600 | [diff] [blame] | 83 | if (connect(fd, (struct sockaddr *)&sa, sizeof(sa)) < 0) |
| 84 | goto fail; |
Jeff King | 1eb10f4 | 2012-01-09 23:44:30 -0500 | [diff] [blame] | 85 | unix_sockaddr_cleanup(&ctx); |
Jeff King | e277097 | 2011-12-10 05:34:14 -0500 | [diff] [blame] | 86 | return fd; |
Jonathan Nieder | 06121a0 | 2012-01-11 17:50:10 -0600 | [diff] [blame] | 87 | |
| 88 | fail: |
| 89 | saved_errno = errno; |
| 90 | unix_sockaddr_cleanup(&ctx); |
| 91 | close(fd); |
| 92 | errno = saved_errno; |
| 93 | return -1; |
Jeff King | e277097 | 2011-12-10 05:34:14 -0500 | [diff] [blame] | 94 | } |
| 95 | |
| 96 | int unix_stream_listen(const char *path) |
| 97 | { |
Jonathan Nieder | 06121a0 | 2012-01-11 17:50:10 -0600 | [diff] [blame] | 98 | int fd, saved_errno; |
Jeff King | e277097 | 2011-12-10 05:34:14 -0500 | [diff] [blame] | 99 | struct sockaddr_un sa; |
Jeff King | 1eb10f4 | 2012-01-09 23:44:30 -0500 | [diff] [blame] | 100 | struct unix_sockaddr_context ctx; |
Jeff King | e277097 | 2011-12-10 05:34:14 -0500 | [diff] [blame] | 101 | |
René Scharfe | 2869b3e | 2014-07-20 10:00:41 +0200 | [diff] [blame] | 102 | unlink(path); |
| 103 | |
Jeff King | 1eb10f4 | 2012-01-09 23:44:30 -0500 | [diff] [blame] | 104 | if (unix_sockaddr_init(&sa, path, &ctx) < 0) |
| 105 | return -1; |
Jeff King | e277097 | 2011-12-10 05:34:14 -0500 | [diff] [blame] | 106 | fd = unix_stream_socket(); |
| 107 | |
Jonathan Nieder | 06121a0 | 2012-01-11 17:50:10 -0600 | [diff] [blame] | 108 | if (bind(fd, (struct sockaddr *)&sa, sizeof(sa)) < 0) |
| 109 | goto fail; |
Jeff King | e277097 | 2011-12-10 05:34:14 -0500 | [diff] [blame] | 110 | |
Jonathan Nieder | 06121a0 | 2012-01-11 17:50:10 -0600 | [diff] [blame] | 111 | if (listen(fd, 5) < 0) |
| 112 | goto fail; |
Jeff King | e277097 | 2011-12-10 05:34:14 -0500 | [diff] [blame] | 113 | |
Jeff King | 1eb10f4 | 2012-01-09 23:44:30 -0500 | [diff] [blame] | 114 | unix_sockaddr_cleanup(&ctx); |
Jeff King | e277097 | 2011-12-10 05:34:14 -0500 | [diff] [blame] | 115 | return fd; |
Jonathan Nieder | 06121a0 | 2012-01-11 17:50:10 -0600 | [diff] [blame] | 116 | |
| 117 | fail: |
| 118 | saved_errno = errno; |
| 119 | unix_sockaddr_cleanup(&ctx); |
| 120 | close(fd); |
| 121 | errno = saved_errno; |
| 122 | return -1; |
Jeff King | e277097 | 2011-12-10 05:34:14 -0500 | [diff] [blame] | 123 | } |