diff options
Diffstat (limited to 'util.c')
| -rw-r--r-- | util.c | 62 |
1 files changed, 62 insertions, 0 deletions
@@ -179,6 +179,68 @@ int sock_l4_sa(const struct ctx *c, enum epoll_type type, } /** + * sock_unix() - Create and bind AF_UNIX socket + * @sock_path: Socket path. If empty, set on return (UNIX_SOCK_PATH as prefix) + * + * Return: socket descriptor on success, won't return on failure + */ +int sock_unix(char *sock_path) +{ + int fd = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0); + struct sockaddr_un addr = { + .sun_family = AF_UNIX, + }; + int i; + + if (fd < 0) + die_perror("Failed to open UNIX domain socket"); + + for (i = 1; i < UNIX_SOCK_MAX; i++) { + char *path = addr.sun_path; + int ex, ret; + + if (*sock_path) + memcpy(path, sock_path, UNIX_PATH_MAX); + else if (snprintf_check(path, UNIX_PATH_MAX - 1, + UNIX_SOCK_PATH, i)) + die_perror("Can't build UNIX domain socket path"); + + ex = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, + 0); + if (ex < 0) + die_perror("Failed to check for UNIX domain conflicts"); + + ret = connect(ex, (const struct sockaddr *)&addr, sizeof(addr)); + if (!ret || (errno != ENOENT && errno != ECONNREFUSED && + errno != EACCES)) { + if (*sock_path) + die("Socket path %s already in use", path); + + close(ex); + continue; + } + close(ex); + + unlink(path); + ret = bind(fd, (const struct sockaddr *)&addr, sizeof(addr)); + if (*sock_path && ret) + die_perror("Failed to bind UNIX domain socket"); + + if (!ret) + break; + } + + if (i == UNIX_SOCK_MAX) + die_perror("Failed to bind UNIX domain socket"); + + info("UNIX domain socket bound at %s", addr.sun_path); + if (!*sock_path) + memcpy(sock_path, addr.sun_path, UNIX_PATH_MAX); + + return fd; +} + +/** * sock_probe_mem() - Check if setting high SO_SNDBUF and SO_RCVBUF is allowed * @c: Execution context */ |