/*-*- Mode: C; c-basic-offset: 8 -*-*/ /*** Copyright 2010 Lennart Poettering Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. ***/ #include #include #include #include #include #include #include #include #include #include "sd-daemon.h" int sd_listen_fds(int unset_environment) { #ifdef DISABLE_SYSTEMD return 0; #else int r; const char *e; char *p = NULL; unsigned long l; if (!(e = getenv("LISTEN_PID"))) { r = 0; goto finish; } errno = 0; l = strtoul(e, &p, 10); if (errno != 0) { r = -errno; goto finish; } if (!p || *p || l <= 0) { r = -EINVAL; goto finish; } /* Is this for us? */ if (getpid() != (pid_t) l) { r = 0; goto finish; } if (!(e = getenv("LISTEN_FDS"))) { r = 0; goto finish; } errno = 0; l = strtoul(e, &p, 10); if (errno != 0) { r = -errno; goto finish; } if (!p || *p) { r = -EINVAL; goto finish; } r = (int) l; finish: if (unset_environment) { unsetenv("LISTEN_PID"); unsetenv("LISTEN_FDS"); } return r; #endif } int sd_is_fifo(int fd, const char *path) { struct stat st_fd; if (fd < 0) return -EINVAL; memset(&st_fd, 0, sizeof(st_fd)); if (fstat(fd, &st_fd) < 0) return -errno; if (!S_ISFIFO(st_fd.st_mode)) return 0; if (path) { struct stat st_path; memset(&st_path, 0, sizeof(st_path)); if (fstat(fd, &st_path) < 0) { if (errno == ENOENT || errno == ENOTDIR) return 0; return -errno; } return st_path.st_dev == st_fd.st_dev && st_path.st_ino == st_fd.st_ino; } return 1; } static int sd_is_socket_internal(int fd, int type, int listening) { struct stat st_fd; if (fd < 0 || type < 0) return -EINVAL; if (fstat(fd, &st_fd) < 0) return -errno; if (!S_ISSOCK(st_fd.st_mode)) return 0; if (type != 0) { int other_type = 0; socklen_t l = sizeof(other_type); if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &other_type, &l) < 0) return -errno; if (l != sizeof(other_type)) return -EINVAL; if (other_type != type) return 0; } if (listening >= 0) { int accepting = 0; socklen_t l = sizeof(accepting); if (getsockopt(fd, SOL_SOCKET, SO_ACCEPTCONN, &accepting, &l) < 0) return -errno; if (l != sizeof(accepting)) return -EINVAL; if (!accepting != !listening) return 0; } return 1; } union sockaddr_union { struct sockaddr sa; struct sockaddr_in in4; struct sockaddr_in6 in6; struct sockaddr_un un; struct sockaddr_storage storage; }; int sd_is_socket(int fd, int family, int type, int listening) { int r; if (family < 0) return -EINVAL; if ((r = sd_is_socket_internal(fd, type, listening)) <= 0) return r; if (family > 0) { union sockaddr_union sockaddr; socklen_t l; memset(&sockaddr, 0, sizeof(sockaddr)); l = sizeof(sockaddr); if (getsockname(fd, &sockaddr.sa, &l) < 0) return -errno; if (l < sizeof(sa_family_t)) return -EINVAL; return sockaddr.sa.sa_family == family; } return 1; } int sd_is_socket_inet(int fd, int family, int type, int listening, uint16_t port) { union sockaddr_union sockaddr; socklen_t l; int r; if (family != 0 && family != AF_INET && family != AF_INET6) return -EINVAL; if ((r = sd_is_socket_internal(fd, type, listening)) <= 0) return r; memset(&sockaddr, 0, sizeof(sockaddr)); l = sizeof(sockaddr); if (getsockname(fd, &sockaddr.sa, &l) < 0) return -errno; if (l < sizeof(sa_family_t)) return -EINVAL; if (sockaddr.sa.sa_family != AF_INET && sockaddr.sa.sa_family != AF_INET6) return 0; if (family > 0) if (sockaddr.sa.sa_family != family) return 0; if (port > 0) { if (sockaddr.sa.sa_family == AF_INET) { if (l < sizeof(struct sockaddr_in)) return -EINVAL; return htons(port) == sockaddr.in4.sin_port; } else { if (l < sizeof(struct sockaddr_in6)) return -EINVAL; return htons(port) == sockaddr.in6.sin6_port; } } return 1; } int sd_is_socket_unix(int fd, int type, int listening, const char *path, size_t length) { union sockaddr_union sockaddr; socklen_t l; int r; if ((r = sd_is_socket_internal(fd, type, listening)) <= 0) return r; memset(&sockaddr, 0, sizeof(sockaddr)); l = sizeof(sockaddr); if (getsockname(fd, &sockaddr.sa, &l) < 0) return -errno; if (l < sizeof(sa_family_t)) return -EINVAL; if (sockaddr.sa.sa_family != AF_UNIX) return 0; if (path) { if (length <= 0) length = strlen(path); if (length <= 0) /* Unnamed socket */ return l == sizeof(sa_family_t); if (path[0]) /* Normal path socket */ return (l >= sizeof(sa_family_t) + length + 1) && memcmp(path, sockaddr.un.sun_path, length+1) == 0; else /* Abstract namespace socket */ return (l == sizeof(sa_family_t) + length) && memcmp(path, sockaddr.un.sun_path, length) == 0; } return 1; }