/*-*- Mode: C; c-basic-offset: 8 -*-*/ /*** This file is part of systemd. Copyright 2010 Lennart Poettering systemd is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. systemd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include <assert.h> #include <string.h> #include <unistd.h> #include <errno.h> #include <stdlib.h> #include <arpa/inet.h> #include <stdio.h> #include <net/if.h> #include <sys/types.h> #include <sys/stat.h> #include "macro.h" #include "util.h" #include "socket-util.h" #include "missing.h" int socket_address_parse(SocketAddress *a, const char *s) { int r; char *e, *n; unsigned u; assert(a); assert(s); zero(*a); a->type = SOCK_STREAM; if (*s == '[') { /* IPv6 in [x:.....:z]:p notation */ if (!(e = strchr(s+1, ']'))) return -EINVAL; if (!(n = strndup(s+1, e-s-1))) return -ENOMEM; errno = 0; if (inet_pton(AF_INET6, n, &a->sockaddr.in6.sin6_addr) <= 0) { free(n); return errno != 0 ? -errno : -EINVAL; } free(n); e++; if (*e != ':') return -EINVAL; e++; if ((r = safe_atou(e, &u)) < 0) return r; if (u <= 0 || u > 0xFFFF) return -EINVAL; a->sockaddr.in6.sin6_family = AF_INET6; a->sockaddr.in6.sin6_port = htons((uint16_t) u); a->size = sizeof(struct sockaddr_in6); } else if (*s == '/') { /* AF_UNIX socket */ size_t l; l = strlen(s); if (l >= sizeof(a->sockaddr.un.sun_path)) return -EINVAL; a->sockaddr.un.sun_family = AF_UNIX; memcpy(a->sockaddr.un.sun_path, s, l); a->size = sizeof(sa_family_t) + l + 1; } else if (*s == '@') { /* Abstract AF_UNIX socket */ size_t l; l = strlen(s+1); if (l >= sizeof(a->sockaddr.un.sun_path) - 1) return -EINVAL; a->sockaddr.un.sun_family = AF_UNIX; memcpy(a->sockaddr.un.sun_path+1, s+1, l); a->size = sizeof(struct sockaddr_un); } else { if ((e = strchr(s, ':'))) { if ((r = safe_atou(e+1, &u)) < 0) return r; if (u <= 0 || u > 0xFFFF) return -EINVAL; if (!(n = strndup(s, e-s))) return -ENOMEM; /* IPv4 in w.x.y.z:p notation? */ if ((r = inet_pton(AF_INET, n, &a->sockaddr.in4.sin_addr)) < 0) { free(n); return -errno; } if (r > 0) { /* Gotcha, it's a traditional IPv4 address */ free(n); a->sockaddr.in4.sin_family = AF_INET; a->sockaddr.in4.sin_port = htons((uint16_t) u); a->size = sizeof(struct sockaddr_in); } else { unsigned idx; if (strlen(n) > IF_NAMESIZE-1) { free(n); return -EINVAL; } /* Uh, our last resort, an interface name */ idx = if_nametoindex(n); free(n); if (idx == 0) return -EINVAL; a->sockaddr.in6.sin6_family = AF_INET6; a->sockaddr.in6.sin6_port = htons((uint16_t) u); a->sockaddr.in6.sin6_scope_id = idx; a->sockaddr.in6.sin6_addr = in6addr_any; a->size = sizeof(struct sockaddr_in6); } } else { /* Just a port */ if ((r = safe_atou(s, &u)) < 0) return r; if (u <= 0 || u > 0xFFFF) return -EINVAL; a->sockaddr.in6.sin6_family = AF_INET6; a->sockaddr.in6.sin6_port = htons((uint16_t) u); a->sockaddr.in6.sin6_addr = in6addr_any; a->size = sizeof(struct sockaddr_in6); } } return 0; } int socket_address_verify(const SocketAddress *a) { assert(a); switch (socket_address_family(a)) { case AF_INET: if (a->size != sizeof(struct sockaddr_in)) return -EINVAL; if (a->sockaddr.in4.sin_port == 0) return -EINVAL; return 0; case AF_INET6: if (a->size != sizeof(struct sockaddr_in6)) return -EINVAL; if (a->sockaddr.in6.sin6_port == 0) return -EINVAL; return 0; case AF_UNIX: if (a->size < sizeof(sa_family_t)) return -EINVAL; if (a->size > sizeof(sa_family_t)) { if (a->sockaddr.un.sun_path[0] == 0) { /* abstract */ if (a->size != sizeof(struct sockaddr_un)) return -EINVAL; } else { char *e; /* path */ if (!(e = memchr(a->sockaddr.un.sun_path, 0, sizeof(a->sockaddr.un.sun_path)))) return -EINVAL; if (a->size != sizeof(sa_family_t) + (e - a->sockaddr.un.sun_path) + 1) return -EINVAL; } } return 0; default: return -EAFNOSUPPORT; } } int socket_address_print(const SocketAddress *a, char **p) { int r; assert(a); assert(p); if ((r = socket_address_verify(a)) < 0) return r; switch (socket_address_family(a)) { case AF_INET: { char *ret; if (!(ret = new(char, INET_ADDRSTRLEN+1+5+1))) return -ENOMEM; if (!inet_ntop(AF_INET, &a->sockaddr.in4.sin_addr, ret, INET_ADDRSTRLEN)) { free(ret); return -errno; } sprintf(strchr(ret, 0), ":%u", ntohs(a->sockaddr.in4.sin_port)); *p = ret; return 0; } case AF_INET6: { char *ret; if (!(ret = new(char, 1+INET6_ADDRSTRLEN+2+5+1))) return -ENOMEM; ret[0] = '['; if (!inet_ntop(AF_INET6, &a->sockaddr.in6.sin6_addr, ret+1, INET6_ADDRSTRLEN)) { free(ret); return -errno; } sprintf(strchr(ret, 0), "]:%u", ntohs(a->sockaddr.in6.sin6_port)); *p = ret; return 0; } case AF_UNIX: { char *ret; if (a->size <= sizeof(sa_family_t)) { if (!(ret = strdup("<unamed>"))) return -ENOMEM; } else if (a->sockaddr.un.sun_path[0] == 0) { /* abstract */ /* FIXME: We assume we can print the * socket path here and that it hasn't * more than one NUL byte. That is * actually an invalid assumption */ if (!(ret = new(char, sizeof(a->sockaddr.un.sun_path)+1))) return -ENOMEM; ret[0] = '@'; memcpy(ret+1, a->sockaddr.un.sun_path+1, sizeof(a->sockaddr.un.sun_path)-1); ret[sizeof(a->sockaddr.un.sun_path)] = 0; } else { if (!(ret = strdup(a->sockaddr.un.sun_path))) return -ENOMEM; } *p = ret; return 0; } default: return -EINVAL; } } int socket_address_listen( const SocketAddress *a, int backlog, SocketAddressBindIPv6Only only, const char *bind_to_device, bool free_bind, mode_t directory_mode, mode_t socket_mode, int *ret) { int r, fd, one; assert(a); assert(ret); if ((r = socket_address_verify(a)) < 0) return r; if ((fd = socket(socket_address_family(a), a->type | SOCK_NONBLOCK | SOCK_CLOEXEC, 0)) < 0) return -errno; if (socket_address_family(a) == AF_INET6 && only != SOCKET_ADDRESS_DEFAULT) { int flag = only == SOCKET_ADDRESS_IPV6_ONLY; if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &flag, sizeof(flag)) < 0) goto fail; } if (bind_to_device) if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, bind_to_device, strlen(bind_to_device)+1) < 0) goto fail; if (free_bind) { one = 1; if (setsockopt(fd, IPPROTO_IP, IP_FREEBIND, &one, sizeof(one)) < 0) log_warning("IP_FREEBIND failed: %m"); } one = 1; if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) < 0) goto fail; if (socket_address_family(a) == AF_UNIX && a->sockaddr.un.sun_path[0] != 0) { mode_t old_mask; /* Create parents */ mkdir_parents(a->sockaddr.un.sun_path, directory_mode); /* Enforce the right access mode for the socket*/ old_mask = umask(~ socket_mode); /* Include the original umask in our mask */ umask(~socket_mode | old_mask); r = bind(fd, &a->sockaddr.sa, a->size); if (r < 0 && errno == EADDRINUSE) { /* Unlink and try again */ unlink(a->sockaddr.un.sun_path); r = bind(fd, &a->sockaddr.sa, a->size); } umask(old_mask); } else r = bind(fd, &a->sockaddr.sa, a->size); if (r < 0) goto fail; if (a->type == SOCK_STREAM) if (listen(fd, backlog) < 0) goto fail; *ret = fd; return 0; fail: r = -errno; close_nointr_nofail(fd); return r; } bool socket_address_can_accept(const SocketAddress *a) { assert(a); return a->type == SOCK_STREAM || a->type == SOCK_SEQPACKET; } bool socket_address_equal(const SocketAddress *a, const SocketAddress *b) { assert(a); assert(b); /* Invalid addresses are unequal to all */ if (socket_address_verify(a) < 0 || socket_address_verify(b) < 0) return false; if (a->type != b->type) return false; if (a->size != b->size) return false; if (socket_address_family(a) != socket_address_family(b)) return false; switch (socket_address_family(a)) { case AF_INET: if (a->sockaddr.in4.sin_addr.s_addr != b->sockaddr.in4.sin_addr.s_addr) return false; if (a->sockaddr.in4.sin_port != b->sockaddr.in4.sin_port) return false; break; case AF_INET6: if (memcmp(&a->sockaddr.in6.sin6_addr, &b->sockaddr.in6.sin6_addr, sizeof(a->sockaddr.in6.sin6_addr)) != 0) return false; if (a->sockaddr.in6.sin6_port != b->sockaddr.in6.sin6_port) return false; break; case AF_UNIX: if ((a->sockaddr.un.sun_path[0] == 0) != (b->sockaddr.un.sun_path[0] == 0)) return false; if (a->sockaddr.un.sun_path[0]) { if (strncmp(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, sizeof(a->sockaddr.un.sun_path)) != 0) return false; } else { if (memcmp(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, sizeof(a->sockaddr.un.sun_path)) != 0) return false; } break; default: /* Cannot compare, so we assume the addresses are different */ return false; } return true; } bool socket_address_is(const SocketAddress *a, const char *s, int type) { struct SocketAddress b; assert(a); assert(s); if (socket_address_parse(&b, s) < 0) return false; b.type = type; return socket_address_equal(a, &b); } bool socket_address_needs_mount(const SocketAddress *a, const char *prefix) { assert(a); if (socket_address_family(a) != AF_UNIX) return false; if (a->sockaddr.un.sun_path[0] == 0) return false; return path_startswith(a->sockaddr.un.sun_path, prefix); } static const char* const socket_address_bind_ipv6_only_table[_SOCKET_ADDRESS_BIND_IPV6_ONLY_MAX] = { [SOCKET_ADDRESS_DEFAULT] = "default", [SOCKET_ADDRESS_BOTH] = "both", [SOCKET_ADDRESS_IPV6_ONLY] = "ipv6-only" }; DEFINE_STRING_TABLE_LOOKUP(socket_address_bind_ipv6_only, SocketAddressBindIPv6Only);