[people/ms/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, ':'))) {
                        int r;

                        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	int r;
	107
	108	if ((r = safe_atou(e+1, &u)) < 0)
	109	return r;
	110
	111	if (u <= 0 \|\| u > 0xFFFF)
	112	return -EINVAL;
42f4e3c4	113
42f4e3c4 LP	114	if (!(n = strndup(s, e-s)))
	115	return -ENOMEM;
	116
542563ba LP	117	/* IPv4 in w.x.y.z:p notation? */
542563ba LP	118	if ((r = inet_pton(AF_INET, n, &a->sockaddr.in4.sin_addr)) < 0) {
42f4e3c4	119	free(n);
542563ba	120	return -errno;
42f4e3c4 LP	121	}
42f4e3c4 LP	122
542563ba LP	123	if (r > 0) {
	124	/* Gotcha, it's a traditional IPv4 address */
	125	free(n);
42f4e3c4	126
542563ba LP	127	a->sockaddr.in4.sin_family = AF_INET;
	128	a->sockaddr.in4.sin_port = htons((uint16_t) u);
	129	a->size = sizeof(struct sockaddr_in);
	130	} else {
	131	unsigned idx;
42f4e3c4	132
acbb0225 LP	133	if (strlen(n) > IF_NAMESIZE-1) {
	134	free(n);
	135	return -EINVAL;
	136	}
	137
542563ba LP	138	/* Uh, our last resort, an interface name */
	139	idx = if_nametoindex(n);
	140	free(n);
	141
83c60c9f	142	if (idx == 0)
542563ba	143	return -EINVAL;
42f4e3c4	144
542563ba LP	145	a->sockaddr.in6.sin6_family = AF_INET6;
	146	a->sockaddr.in6.sin6_port = htons((uint16_t) u);
	147	a->sockaddr.in6.sin6_scope_id = idx;
83c60c9f	148	a->sockaddr.in6.sin6_addr = in6addr_any;
542563ba	149	a->size = sizeof(struct sockaddr_in6);
acbb0225	150
542563ba	151	}
42f4e3c4 LP	152	} else {
	153
	154	/* Just a port */
	155	if ((r = safe_atou(s, &u)) < 0)
	156	return r;
	157
	158	if (u <= 0 \|\| u > 0xFFFF)
	159	return -EINVAL;
	160
	161	a->sockaddr.in6.sin6_family = AF_INET6;
42f4e3c4	162	a->sockaddr.in6.sin6_port = htons((uint16_t) u);
83c60c9f	163	a->sockaddr.in6.sin6_addr = in6addr_any;
42f4e3c4 LP	164	a->size = sizeof(struct sockaddr_in6);
	165	}
	166	}
	167
	168	return 0;
	169	}
	170
542563ba	171	int socket_address_verify(const SocketAddress *a) {
42f4e3c4 LP	172	assert(a);
42f4e3c4 LP	173
542563ba	174	switch (socket_address_family(a)) {
42f4e3c4 LP	175	case AF_INET:
	176	if (a->size != sizeof(struct sockaddr_in))
	177	return -EINVAL;
	178
	179	if (a->sockaddr.in4.sin_port == 0)
	180	return -EINVAL;
	181
	182	return 0;
	183
	184	case AF_INET6:
	185	if (a->size != sizeof(struct sockaddr_in6))
	186	return -EINVAL;
	187
	188	if (a->sockaddr.in6.sin6_port == 0)
	189	return -EINVAL;
	190
	191	return 0;
	192
	193	case AF_UNIX:
	194	if (a->size < sizeof(sa_family_t))
	195	return -EINVAL;
	196
	197	if (a->size > sizeof(sa_family_t)) {
	198
	199	if (a->sockaddr.un.sun_path[0] == 0) {
	200	/* abstract */
	201	if (a->size != sizeof(struct sockaddr_un))
	202	return -EINVAL;
	203	} else {
	204	char *e;
	205
	206	/* path */
	207	if (!(e = memchr(a->sockaddr.un.sun_path, 0, sizeof(a->sockaddr.un.sun_path))))
	208	return -EINVAL;
	209
	210	if (a->size != sizeof(sa_family_t) + (e - a->sockaddr.un.sun_path) + 1)
	211	return -EINVAL;
	212	}
	213	}
	214
	215	return 0;
	216
	217	default:
	218	return -EAFNOSUPPORT;
	219	}
	220	}
	221
542563ba	222	int socket_address_print(const SocketAddress a, char *p) {
42f4e3c4 LP	223	int r;
	224	assert(a);
	225	assert(p);
	226
542563ba	227	if ((r = socket_address_verify(a)) < 0)
42f4e3c4 LP	228	return r;
42f4e3c4 LP	229
542563ba	230	switch (socket_address_family(a)) {
42f4e3c4 LP	231	case AF_INET: {
	232	char *ret;
	233
	234	if (!(ret = new(char, INET_ADDRSTRLEN+1+5+1)))
	235	return -ENOMEM;
	236
	237	if (!inet_ntop(AF_INET, &a->sockaddr.in4.sin_addr, ret, INET_ADDRSTRLEN)) {
	238	free(ret);
	239	return -errno;
	240	}
	241
	242	sprintf(strchr(ret, 0), ":%u", ntohs(a->sockaddr.in4.sin_port));
	243	*p = ret;
	244	return 0;
	245	}
	246
	247	case AF_INET6: {
	248	char *ret;
	249
	250	if (!(ret = new(char, 1+INET6_ADDRSTRLEN+2+5+1)))
	251	return -ENOMEM;
	252
	253	ret[0] = '[';
	254	if (!inet_ntop(AF_INET6, &a->sockaddr.in6.sin6_addr, ret+1, INET6_ADDRSTRLEN)) {
	255	free(ret);
	256	return -errno;
	257	}
	258
	259	sprintf(strchr(ret, 0), "]:%u", ntohs(a->sockaddr.in6.sin6_port));
	260	*p = ret;
	261	return 0;
	262	}
	263
	264	case AF_UNIX: {
	265	char *ret;
	266
	267	if (a->size <= sizeof(sa_family_t)) {
	268
	269	if (!(ret = strdup("<unamed>")))
	270	return -ENOMEM;
	271
	272	} else if (a->sockaddr.un.sun_path[0] == 0) {
	273	/* abstract */
	274
	275	/* FIXME: We assume we can print the
	276	* socket path here and that it hasn't
	277	* more than one NUL byte. That is
	278	* actually an invalid assumption */
	279
	280	if (!(ret = new(char, sizeof(a->sockaddr.un.sun_path)+1)))
	281	return -ENOMEM;
	282
1c24e7bd	283	ret[0] = '@';
42f4e3c4 LP	284	memcpy(ret+1, a->sockaddr.un.sun_path+1, sizeof(a->sockaddr.un.sun_path)-1);
	285	ret[sizeof(a->sockaddr.un.sun_path)] = 0;
	286
	287	} else {
	288
	289	if (!(ret = strdup(a->sockaddr.un.sun_path)))
	290	return -ENOMEM;
	291	}
	292
	293	*p = ret;
	294	return 0;
	295	}
	296
	297	default:
	298	return -EINVAL;
	299	}
	300	}
	301
acbb0225 LP	302	int socket_address_listen(const SocketAddress a, int backlog, SocketAddressBindIPv6Only only, const char bind_to_device, int *ret) {
acbb0225 LP	303	int r, fd, one;
42f4e3c4	304	assert(a);
83c60c9f	305	assert(ret);
42f4e3c4	306
542563ba	307	if ((r = socket_address_verify(a)) < 0)
42f4e3c4 LP	308	return r;
42f4e3c4 LP	309
542563ba	310	if ((fd = socket(socket_address_family(a), a->type \| SOCK_NONBLOCK \| SOCK_CLOEXEC, 0)) < 0)
42f4e3c4 LP	311	return -errno;
42f4e3c4 LP	312
542563ba LP	313	if (socket_address_family(a) == AF_INET6 && only != SOCKET_ADDRESS_DEFAULT) {
	314	int flag = only == SOCKET_ADDRESS_IPV6_ONLY;
	315
acbb0225 LP	316	if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &flag, sizeof(flag)) < 0)
acbb0225 LP	317	goto fail;
542563ba LP	318	}
542563ba LP	319
acbb0225 LP	320	if (bind_to_device)
	321	if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, bind_to_device, strlen(bind_to_device)+1) < 0)
	322	goto fail;
	323
	324	one = 1;
	325	if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) < 0)
	326	goto fail;
	327
	328	if (bind(fd, &a->sockaddr.sa, a->size) < 0)
	329	goto fail;
42f4e3c4 LP	330
42f4e3c4 LP	331	if (a->type == SOCK_STREAM)
acbb0225 LP	332	if (listen(fd, backlog) < 0)
acbb0225 LP	333	goto fail;
42f4e3c4	334
83c60c9f	335	*ret = fd;
42f4e3c4	336	return 0;
acbb0225 LP	337
	338	fail:
	339	r = -errno;
	340	close_nointr(fd);
	341	return r;
42f4e3c4	342	}