From e99e38bbdcca3fe5956823bdb3d38544ccf93221 Mon Sep 17 00:00:00 2001 From: Lennart Poettering Date: Sun, 16 May 2010 18:45:24 +0200 Subject: build-sys: move source files to subdirectory --- src/socket-util.c | 468 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 468 insertions(+) create mode 100644 src/socket-util.c (limited to 'src/socket-util.c') diff --git a/src/socket-util.c b/src/socket-util.c new file mode 100644 index 0000000000..32f6bcb941 --- /dev/null +++ b/src/socket-util.c @@ -0,0 +1,468 @@ +/*-*- 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 . +***/ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "macro.h" +#include "util.h" +#include "socket-util.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(""))) + 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, + 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; + + 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) { + struct SocketAddress b; + + assert(a); + assert(s); + + if (socket_address_parse(&b, s) < 0) + return false; + + 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); +} -- cgit v1.2.3-54-g00ecf