[people/ms/systemd.git] / socket-util.c

/*-*- Mode: C; c-basic-offset: 8 -*-*/

#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 --/
	2
	3	#include <assert.h>
	4	#include <string.h>
	5	#include <unistd.h>
	6	#include <errno.h>
	7	#include <stdlib.h>
	8	#include <arpa/inet.h>
	9	#include <stdio.h>
542563ba	10	#include <net/if.h>
42f4e3c4 LP	11
	12	#include "macro.h"
	13	#include "util.h"
	14	#include "socket-util.h"
	15
542563ba	16	int socket_address_parse(SocketAddress a, const char s) {
42f4e3c4 LP	17	int r;
	18	char e, n;
	19	unsigned u;
	20
	21	assert(a);
	22	assert(s);
	23
9152c765	24	zero(*a);
542563ba	25	a->type = SOCK_STREAM;
42f4e3c4 LP	26
	27	if (*s == '[') {
	28	/* IPv6 in [x:.....:z]:p notation */
	29
	30	if (!(e = strchr(s+1, ']')))
	31	return -EINVAL;
	32
	33	if (!(n = strndup(s+1, e-s-1)))
	34	return -ENOMEM;
	35
	36	errno = 0;
	37	if (inet_pton(AF_INET6, n, &a->sockaddr.in6.sin6_addr) <= 0) {
	38	free(n);
	39	return errno != 0 ? -errno : -EINVAL;
	40	}
	41
	42	free(n);
	43
	44	e++;
	45	if (*e != ':')
	46	return -EINVAL;
	47
	48	e++;
	49	if ((r = safe_atou(e, &u)) < 0)
	50	return r;
	51
	52	if (u <= 0 \|\| u > 0xFFFF)
	53	return -EINVAL;
	54
	55	a->sockaddr.in6.sin6_family = AF_INET6;
	56	a->sockaddr.in6.sin6_port = htons((uint16_t) u);
	57	a->size = sizeof(struct sockaddr_in6);
42f4e3c4 LP	58
	59	} else if (*s == '/') {
	60	/* AF_UNIX socket */
	61
	62	size_t l;
	63
	64	l = strlen(s);
	65	if (l >= sizeof(a->sockaddr.un.sun_path))
	66	return -EINVAL;
	67
	68	a->sockaddr.un.sun_family = AF_UNIX;
	69	memcpy(a->sockaddr.un.sun_path, s, l);
	70	a->size = sizeof(sa_family_t) + l + 1;
	71
1c24e7bd	72	} else if (*s == '@') {
42f4e3c4 LP	73	/* Abstract AF_UNIX socket */
	74	size_t l;
	75
	76	l = strlen(s+1);
	77	if (l >= sizeof(a->sockaddr.un.sun_path) - 1)
	78	return -EINVAL;
	79
	80	a->sockaddr.un.sun_family = AF_UNIX;
	81	memcpy(a->sockaddr.un.sun_path+1, s+1, l);
	82	a->size = sizeof(struct sockaddr_un);
	83
	84	} else {
	85
	86	if ((e = strchr(s, ':'))) {
542563ba LP	87	int r;
	88
	89	if ((r = safe_atou(e+1, &u)) < 0)
	90	return r;
	91
	92	if (u <= 0 \|\| u > 0xFFFF)
	93	return -EINVAL;
42f4e3c4	94
42f4e3c4 LP	95	if (!(n = strndup(s, e-s)))
	96	return -ENOMEM;
	97
542563ba LP	98	/* IPv4 in w.x.y.z:p notation? */
542563ba LP	99	if ((r = inet_pton(AF_INET, n, &a->sockaddr.in4.sin_addr)) < 0) {
42f4e3c4	100	free(n);
542563ba	101	return -errno;
42f4e3c4 LP	102	}
42f4e3c4 LP	103
542563ba LP	104	if (r > 0) {
	105	/* Gotcha, it's a traditional IPv4 address */
	106	free(n);
42f4e3c4	107
542563ba LP	108	a->sockaddr.in4.sin_family = AF_INET;
	109	a->sockaddr.in4.sin_port = htons((uint16_t) u);
	110	a->size = sizeof(struct sockaddr_in);
	111	} else {
	112	unsigned idx;
42f4e3c4	113
acbb0225 LP	114	if (strlen(n) > IF_NAMESIZE-1) {
	115	free(n);
	116	return -EINVAL;
	117	}
	118
542563ba LP	119	/* Uh, our last resort, an interface name */
	120	idx = if_nametoindex(n);
	121	free(n);
	122
83c60c9f	123	if (idx == 0)
542563ba	124	return -EINVAL;
42f4e3c4	125
542563ba LP	126	a->sockaddr.in6.sin6_family = AF_INET6;
	127	a->sockaddr.in6.sin6_port = htons((uint16_t) u);
	128	a->sockaddr.in6.sin6_scope_id = idx;
83c60c9f	129	a->sockaddr.in6.sin6_addr = in6addr_any;
542563ba	130	a->size = sizeof(struct sockaddr_in6);
acbb0225	131
542563ba	132	}
42f4e3c4 LP	133	} else {
	134
	135	/* Just a port */
	136	if ((r = safe_atou(s, &u)) < 0)
	137	return r;
	138
	139	if (u <= 0 \|\| u > 0xFFFF)
	140	return -EINVAL;
	141
	142	a->sockaddr.in6.sin6_family = AF_INET6;
42f4e3c4	143	a->sockaddr.in6.sin6_port = htons((uint16_t) u);
83c60c9f	144	a->sockaddr.in6.sin6_addr = in6addr_any;
42f4e3c4 LP	145	a->size = sizeof(struct sockaddr_in6);
	146	}
	147	}
	148
	149	return 0;
	150	}
	151
542563ba	152	int socket_address_verify(const SocketAddress *a) {
42f4e3c4 LP	153	assert(a);
42f4e3c4 LP	154
542563ba	155	switch (socket_address_family(a)) {
42f4e3c4 LP	156	case AF_INET:
	157	if (a->size != sizeof(struct sockaddr_in))
	158	return -EINVAL;
	159
	160	if (a->sockaddr.in4.sin_port == 0)
	161	return -EINVAL;
	162
	163	return 0;
	164
	165	case AF_INET6:
	166	if (a->size != sizeof(struct sockaddr_in6))
	167	return -EINVAL;
	168
	169	if (a->sockaddr.in6.sin6_port == 0)
	170	return -EINVAL;
	171
	172	return 0;
	173
	174	case AF_UNIX:
	175	if (a->size < sizeof(sa_family_t))
	176	return -EINVAL;
	177
	178	if (a->size > sizeof(sa_family_t)) {
	179
	180	if (a->sockaddr.un.sun_path[0] == 0) {
	181	/* abstract */
	182	if (a->size != sizeof(struct sockaddr_un))
	183	return -EINVAL;
	184	} else {
	185	char *e;
	186
	187	/* path */
	188	if (!(e = memchr(a->sockaddr.un.sun_path, 0, sizeof(a->sockaddr.un.sun_path))))
	189	return -EINVAL;
	190
	191	if (a->size != sizeof(sa_family_t) + (e - a->sockaddr.un.sun_path) + 1)
	192	return -EINVAL;
	193	}
	194	}
	195
	196	return 0;
	197
	198	default:
	199	return -EAFNOSUPPORT;
	200	}
	201	}
	202
542563ba	203	int socket_address_print(const SocketAddress a, char *p) {
42f4e3c4 LP	204	int r;
	205	assert(a);
	206	assert(p);
	207
542563ba	208	if ((r = socket_address_verify(a)) < 0)
42f4e3c4 LP	209	return r;
42f4e3c4 LP	210
542563ba	211	switch (socket_address_family(a)) {
42f4e3c4 LP	212	case AF_INET: {
	213	char *ret;
	214
	215	if (!(ret = new(char, INET_ADDRSTRLEN+1+5+1)))
	216	return -ENOMEM;
	217
	218	if (!inet_ntop(AF_INET, &a->sockaddr.in4.sin_addr, ret, INET_ADDRSTRLEN)) {
	219	free(ret);
	220	return -errno;
	221	}
	222
	223	sprintf(strchr(ret, 0), ":%u", ntohs(a->sockaddr.in4.sin_port));
	224	*p = ret;
	225	return 0;
	226	}
	227
	228	case AF_INET6: {
	229	char *ret;
	230
	231	if (!(ret = new(char, 1+INET6_ADDRSTRLEN+2+5+1)))
	232	return -ENOMEM;
	233
	234	ret[0] = '[';
	235	if (!inet_ntop(AF_INET6, &a->sockaddr.in6.sin6_addr, ret+1, INET6_ADDRSTRLEN)) {
	236	free(ret);
	237	return -errno;
	238	}
	239
	240	sprintf(strchr(ret, 0), "]:%u", ntohs(a->sockaddr.in6.sin6_port));
	241	*p = ret;
	242	return 0;
	243	}
	244
	245	case AF_UNIX: {
	246	char *ret;
	247
	248	if (a->size <= sizeof(sa_family_t)) {
	249
	250	if (!(ret = strdup("<unamed>")))
	251	return -ENOMEM;
	252
	253	} else if (a->sockaddr.un.sun_path[0] == 0) {
	254	/* abstract */
	255
	256	/* FIXME: We assume we can print the
	257	* socket path here and that it hasn't
	258	* more than one NUL byte. That is
	259	* actually an invalid assumption */
	260
	261	if (!(ret = new(char, sizeof(a->sockaddr.un.sun_path)+1)))
	262	return -ENOMEM;
	263
1c24e7bd	264	ret[0] = '@';
42f4e3c4 LP	265	memcpy(ret+1, a->sockaddr.un.sun_path+1, sizeof(a->sockaddr.un.sun_path)-1);
	266	ret[sizeof(a->sockaddr.un.sun_path)] = 0;
	267
	268	} else {
	269
	270	if (!(ret = strdup(a->sockaddr.un.sun_path)))
	271	return -ENOMEM;
	272	}
	273
	274	*p = ret;
	275	return 0;
	276	}
	277
	278	default:
	279	return -EINVAL;
	280	}
	281	}
	282
acbb0225 LP	283	int socket_address_listen(const SocketAddress a, int backlog, SocketAddressBindIPv6Only only, const char bind_to_device, int *ret) {
acbb0225 LP	284	int r, fd, one;
42f4e3c4	285	assert(a);
83c60c9f	286	assert(ret);
42f4e3c4	287
542563ba	288	if ((r = socket_address_verify(a)) < 0)
42f4e3c4 LP	289	return r;
42f4e3c4 LP	290
542563ba	291	if ((fd = socket(socket_address_family(a), a->type \| SOCK_NONBLOCK \| SOCK_CLOEXEC, 0)) < 0)
42f4e3c4 LP	292	return -errno;
42f4e3c4 LP	293
542563ba LP	294	if (socket_address_family(a) == AF_INET6 && only != SOCKET_ADDRESS_DEFAULT) {
	295	int flag = only == SOCKET_ADDRESS_IPV6_ONLY;
	296
acbb0225 LP	297	if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &flag, sizeof(flag)) < 0)
acbb0225 LP	298	goto fail;
542563ba LP	299	}
542563ba LP	300
acbb0225 LP	301	if (bind_to_device)
	302	if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, bind_to_device, strlen(bind_to_device)+1) < 0)
	303	goto fail;
	304
	305	one = 1;
	306	if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) < 0)
	307	goto fail;
	308
	309	if (bind(fd, &a->sockaddr.sa, a->size) < 0)
	310	goto fail;
42f4e3c4 LP	311
42f4e3c4 LP	312	if (a->type == SOCK_STREAM)
acbb0225 LP	313	if (listen(fd, backlog) < 0)
acbb0225 LP	314	goto fail;
42f4e3c4	315
83c60c9f	316	*ret = fd;
42f4e3c4	317	return 0;
acbb0225 LP	318
	319	fail:
	320	r = -errno;
	321	close_nointr(fd);
	322	return r;
42f4e3c4	323	}