[thirdparty/systemd.git] / socket-util.c

/*-*- 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 "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("<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, 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 (bind(fd, &a->sockaddr.sa, a->size) < 0)
                goto fail;

        if (a->type == SOCK_STREAM)
                if (listen(fd, backlog) < 0)
                        goto fail;

        *ret = fd;
        return 0;

fail:
        r = -errno;
        close_nointr(fd);
        return r;
}
Commit	Line	Data
42f4e3c4 LP	1	/-- Mode: C; c-basic-offset: 8 --/
42f4e3c4 LP	2
a7334b09 LP	3	/***
	4	This file is part of systemd.
	5
	6	Copyright 2010 Lennart Poettering
	7
	8	systemd is free software; you can redistribute it and/or modify it
	9	under the terms of the GNU General Public License as published by
	10	the Free Software Foundation; either version 2 of the License, or
	11	(at your option) any later version.
	12
	13	systemd is distributed in the hope that it will be useful, but
	14	WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
	19	along with systemd; If not, see <http://www.gnu.org/licenses/>.
	20	***/
	21
42f4e3c4 LP	22	#include <assert.h>
	23	#include <string.h>
	24	#include <unistd.h>
	25	#include <errno.h>
	26	#include <stdlib.h>
	27	#include <arpa/inet.h>
	28	#include <stdio.h>
542563ba	29	#include <net/if.h>
42f4e3c4 LP	30
	31	#include "macro.h"
	32	#include "util.h"
	33	#include "socket-util.h"
	34
542563ba	35	int socket_address_parse(SocketAddress a, const char s) {
42f4e3c4 LP	36	int r;
	37	char e, n;
	38	unsigned u;
	39
	40	assert(a);
	41	assert(s);
	42
9152c765	43	zero(*a);
542563ba	44	a->type = SOCK_STREAM;
42f4e3c4 LP	45
	46	if (*s == '[') {
	47	/* IPv6 in [x:.....:z]:p notation */
	48
	49	if (!(e = strchr(s+1, ']')))
	50	return -EINVAL;
	51
	52	if (!(n = strndup(s+1, e-s-1)))
	53	return -ENOMEM;
	54
	55	errno = 0;
	56	if (inet_pton(AF_INET6, n, &a->sockaddr.in6.sin6_addr) <= 0) {
	57	free(n);
	58	return errno != 0 ? -errno : -EINVAL;
	59	}
	60
	61	free(n);
	62
	63	e++;
	64	if (*e != ':')
	65	return -EINVAL;
	66
	67	e++;
	68	if ((r = safe_atou(e, &u)) < 0)
	69	return r;
	70
	71	if (u <= 0 \|\| u > 0xFFFF)
	72	return -EINVAL;
	73
	74	a->sockaddr.in6.sin6_family = AF_INET6;
	75	a->sockaddr.in6.sin6_port = htons((uint16_t) u);
	76	a->size = sizeof(struct sockaddr_in6);
42f4e3c4 LP	77
	78	} else if (*s == '/') {
	79	/* AF_UNIX socket */
	80
	81	size_t l;
	82
	83	l = strlen(s);
	84	if (l >= sizeof(a->sockaddr.un.sun_path))
	85	return -EINVAL;
	86
	87	a->sockaddr.un.sun_family = AF_UNIX;
	88	memcpy(a->sockaddr.un.sun_path, s, l);
	89	a->size = sizeof(sa_family_t) + l + 1;
	90
1c24e7bd	91	} else if (*s == '@') {
42f4e3c4 LP	92	/* Abstract AF_UNIX socket */
	93	size_t l;
	94
	95	l = strlen(s+1);
	96	if (l >= sizeof(a->sockaddr.un.sun_path) - 1)
	97	return -EINVAL;
	98
	99	a->sockaddr.un.sun_family = AF_UNIX;
	100	memcpy(a->sockaddr.un.sun_path+1, s+1, l);
	101	a->size = sizeof(struct sockaddr_un);
	102
	103	} else {
	104
	105	if ((e = strchr(s, ':'))) {
542563ba LP	106
	107	if ((r = safe_atou(e+1, &u)) < 0)
	108	return r;
	109
	110	if (u <= 0 \|\| u > 0xFFFF)
	111	return -EINVAL;
42f4e3c4	112
42f4e3c4 LP	113	if (!(n = strndup(s, e-s)))
	114	return -ENOMEM;
	115
542563ba LP	116	/* IPv4 in w.x.y.z:p notation? */
542563ba LP	117	if ((r = inet_pton(AF_INET, n, &a->sockaddr.in4.sin_addr)) < 0) {
42f4e3c4	118	free(n);
542563ba	119	return -errno;
42f4e3c4 LP	120	}
42f4e3c4 LP	121
542563ba LP	122	if (r > 0) {
	123	/* Gotcha, it's a traditional IPv4 address */
	124	free(n);
42f4e3c4	125
542563ba LP	126	a->sockaddr.in4.sin_family = AF_INET;
	127	a->sockaddr.in4.sin_port = htons((uint16_t) u);
	128	a->size = sizeof(struct sockaddr_in);
	129	} else {
	130	unsigned idx;
42f4e3c4	131
acbb0225 LP	132	if (strlen(n) > IF_NAMESIZE-1) {
	133	free(n);
	134	return -EINVAL;
	135	}
	136
542563ba LP	137	/* Uh, our last resort, an interface name */
	138	idx = if_nametoindex(n);
	139	free(n);
	140
83c60c9f	141	if (idx == 0)
542563ba	142	return -EINVAL;
42f4e3c4	143
542563ba LP	144	a->sockaddr.in6.sin6_family = AF_INET6;
	145	a->sockaddr.in6.sin6_port = htons((uint16_t) u);
	146	a->sockaddr.in6.sin6_scope_id = idx;
83c60c9f	147	a->sockaddr.in6.sin6_addr = in6addr_any;
542563ba	148	a->size = sizeof(struct sockaddr_in6);
acbb0225	149
542563ba	150	}
42f4e3c4 LP	151	} else {
	152
	153	/* Just a port */
	154	if ((r = safe_atou(s, &u)) < 0)
	155	return r;
	156
	157	if (u <= 0 \|\| u > 0xFFFF)
	158	return -EINVAL;
	159
	160	a->sockaddr.in6.sin6_family = AF_INET6;
42f4e3c4	161	a->sockaddr.in6.sin6_port = htons((uint16_t) u);
83c60c9f	162	a->sockaddr.in6.sin6_addr = in6addr_any;
42f4e3c4 LP	163	a->size = sizeof(struct sockaddr_in6);
	164	}
	165	}
	166
	167	return 0;
	168	}
	169
542563ba	170	int socket_address_verify(const SocketAddress *a) {
42f4e3c4 LP	171	assert(a);
42f4e3c4 LP	172
542563ba	173	switch (socket_address_family(a)) {
42f4e3c4 LP	174	case AF_INET:
	175	if (a->size != sizeof(struct sockaddr_in))
	176	return -EINVAL;
	177
	178	if (a->sockaddr.in4.sin_port == 0)
	179	return -EINVAL;
	180
	181	return 0;
	182
	183	case AF_INET6:
	184	if (a->size != sizeof(struct sockaddr_in6))
	185	return -EINVAL;
	186
	187	if (a->sockaddr.in6.sin6_port == 0)
	188	return -EINVAL;
	189
	190	return 0;
	191
	192	case AF_UNIX:
	193	if (a->size < sizeof(sa_family_t))
	194	return -EINVAL;
	195
	196	if (a->size > sizeof(sa_family_t)) {
	197
	198	if (a->sockaddr.un.sun_path[0] == 0) {
	199	/* abstract */
	200	if (a->size != sizeof(struct sockaddr_un))
	201	return -EINVAL;
	202	} else {
	203	char *e;
	204
	205	/* path */
	206	if (!(e = memchr(a->sockaddr.un.sun_path, 0, sizeof(a->sockaddr.un.sun_path))))
	207	return -EINVAL;
	208
	209	if (a->size != sizeof(sa_family_t) + (e - a->sockaddr.un.sun_path) + 1)
	210	return -EINVAL;
	211	}
	212	}
	213
	214	return 0;
	215
	216	default:
	217	return -EAFNOSUPPORT;
	218	}
	219	}
	220
542563ba	221	int socket_address_print(const SocketAddress a, char *p) {
42f4e3c4 LP	222	int r;
	223	assert(a);
	224	assert(p);
	225
542563ba	226	if ((r = socket_address_verify(a)) < 0)
42f4e3c4 LP	227	return r;
42f4e3c4 LP	228
542563ba	229	switch (socket_address_family(a)) {
42f4e3c4 LP	230	case AF_INET: {
	231	char *ret;
	232
	233	if (!(ret = new(char, INET_ADDRSTRLEN+1+5+1)))
	234	return -ENOMEM;
	235
	236	if (!inet_ntop(AF_INET, &a->sockaddr.in4.sin_addr, ret, INET_ADDRSTRLEN)) {
	237	free(ret);
	238	return -errno;
	239	}
	240
	241	sprintf(strchr(ret, 0), ":%u", ntohs(a->sockaddr.in4.sin_port));
	242	*p = ret;
	243	return 0;
	244	}
	245
	246	case AF_INET6: {
	247	char *ret;
	248
	249	if (!(ret = new(char, 1+INET6_ADDRSTRLEN+2+5+1)))
	250	return -ENOMEM;
	251
	252	ret[0] = '[';
	253	if (!inet_ntop(AF_INET6, &a->sockaddr.in6.sin6_addr, ret+1, INET6_ADDRSTRLEN)) {
	254	free(ret);
	255	return -errno;
	256	}
	257
	258	sprintf(strchr(ret, 0), "]:%u", ntohs(a->sockaddr.in6.sin6_port));
	259	*p = ret;
	260	return 0;
	261	}
	262
	263	case AF_UNIX: {
	264	char *ret;
	265
	266	if (a->size <= sizeof(sa_family_t)) {
	267
	268	if (!(ret = strdup("<unamed>")))
	269	return -ENOMEM;
	270
	271	} else if (a->sockaddr.un.sun_path[0] == 0) {
	272	/* abstract */
	273
	274	/* FIXME: We assume we can print the
	275	* socket path here and that it hasn't
	276	* more than one NUL byte. That is
	277	* actually an invalid assumption */
	278
	279	if (!(ret = new(char, sizeof(a->sockaddr.un.sun_path)+1)))
	280	return -ENOMEM;
	281
1c24e7bd	282	ret[0] = '@';
42f4e3c4 LP	283	memcpy(ret+1, a->sockaddr.un.sun_path+1, sizeof(a->sockaddr.un.sun_path)-1);
	284	ret[sizeof(a->sockaddr.un.sun_path)] = 0;
	285
	286	} else {
	287
	288	if (!(ret = strdup(a->sockaddr.un.sun_path)))
	289	return -ENOMEM;
	290	}
	291
	292	*p = ret;
	293	return 0;
	294	}
	295
	296	default:
	297	return -EINVAL;
	298	}
	299	}
	300
acbb0225 LP	301	int socket_address_listen(const SocketAddress a, int backlog, SocketAddressBindIPv6Only only, const char bind_to_device, int *ret) {
acbb0225 LP	302	int r, fd, one;
42f4e3c4	303	assert(a);
83c60c9f	304	assert(ret);
42f4e3c4	305
542563ba	306	if ((r = socket_address_verify(a)) < 0)
42f4e3c4 LP	307	return r;
42f4e3c4 LP	308
542563ba	309	if ((fd = socket(socket_address_family(a), a->type \| SOCK_NONBLOCK \| SOCK_CLOEXEC, 0)) < 0)
42f4e3c4 LP	310	return -errno;
42f4e3c4 LP	311
542563ba LP	312	if (socket_address_family(a) == AF_INET6 && only != SOCKET_ADDRESS_DEFAULT) {
	313	int flag = only == SOCKET_ADDRESS_IPV6_ONLY;
	314
acbb0225 LP	315	if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &flag, sizeof(flag)) < 0)
acbb0225 LP	316	goto fail;
542563ba LP	317	}
542563ba LP	318
acbb0225 LP	319	if (bind_to_device)
	320	if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, bind_to_device, strlen(bind_to_device)+1) < 0)
	321	goto fail;
	322
	323	one = 1;
	324	if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) < 0)
	325	goto fail;
	326
	327	if (bind(fd, &a->sockaddr.sa, a->size) < 0)
	328	goto fail;
42f4e3c4 LP	329
42f4e3c4 LP	330	if (a->type == SOCK_STREAM)
acbb0225 LP	331	if (listen(fd, backlog) < 0)
acbb0225 LP	332	goto fail;
42f4e3c4	333
83c60c9f	334	*ret = fd;
42f4e3c4	335	return 0;
acbb0225 LP	336
	337	fail:
	338	r = -errno;
	339	close_nointr(fd);
	340	return r;
42f4e3c4	341	}