[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);

        memset(a, 0, sizeof(*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;

                                /* 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, int *ret) {
        int r, fd;
        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) {
                        close_nointr(fd);
                        return -errno;
                }
        }

        if (bind(fd, &a->sockaddr.sa, a->size) < 0) {
                close_nointr(fd);
                return -errno;
        }

        if (a->type == SOCK_STREAM)
                if (listen(fd, backlog) < 0) {
                        close_nointr(fd);
                        return -errno;
                }

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