[apple/libinfo.git] / gen.subproj / getifmaddrs.c

/*
 * Copyright (c) 2003 Bruce M. Simpson.
 * All rights reserved
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *        This product includes software developed by Bruce M. Simpson.
 * 4. Neither the name of Bruce M. Simpson nor the names of other
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY BRUCE M. SIMPSON AND AFFILIATES
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL BRUCE M. SIMPSON OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <errno.h>
#include <ifaddrs.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>

#define	SALIGN	(sizeof(uint32_t) - 1)
#define	SA_RLEN(sa)	((sa)->sa_len ? (((sa)->sa_len + SALIGN) & ~SALIGN) : \
(SALIGN + 1))
#define	MAX_SYSCTL_TRY	5
#define	RTA_MASKS	(RTA_GATEWAY | RTA_IFP | RTA_IFA)

/* FreeBSD uses NET_RT_IFMALIST and RTM_NEWMADDR from <sys/socket.h> */
/* We can use NET_RT_IFLIST2 and RTM_NEWMADDR2 on Darwin */
#define DARWIN_COMPAT

#ifdef DARWIN_COMPAT
#define GIM_SYSCTL_MIB NET_RT_IFLIST2
#define GIM_RTM_ADDR RTM_NEWMADDR2
#else
#define GIM_SYSCTL_MIB NET_RT_IFMALIST
#define GIM_RTM_ADDR RTM_NEWMADDR
#endif

int
getifmaddrs(struct ifmaddrs **pif)
{
	int icnt = 1;
	int dcnt = 0;
	int ntry = 0;
	size_t len;
	size_t needed;
	int mib[6];
	int i;
	char *buf;
	char *data;
	char *next;
	char *p;
	struct ifma_msghdr2 *ifmam;
	struct ifmaddrs *ifa, *ift;
	struct rt_msghdr *rtm;
	struct sockaddr *sa;

	mib[0] = CTL_NET;
	mib[1] = PF_ROUTE;
	mib[2] = 0;             /* protocol */
	mib[3] = 0;             /* wildcard address family */
	mib[4] = GIM_SYSCTL_MIB;
	mib[5] = 0;             /* no flags */
	do {
		if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
			return (-1);
		if ((buf = malloc(needed)) == NULL)
			return (-1);
		if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
			if (errno != ENOMEM || ++ntry >= MAX_SYSCTL_TRY) {
				free(buf);
				return (-1);
			}
			free(buf);
			buf = NULL;
		} 
	} while (buf == NULL);

	for (next = buf; next < buf + needed; next += rtm->rtm_msglen) {
		rtm = (struct rt_msghdr *)(void *)next;
		if (rtm->rtm_version != RTM_VERSION)
			continue;
		switch (rtm->rtm_type) {
			case GIM_RTM_ADDR:
				ifmam = (struct ifma_msghdr2 *)(void *)rtm;
				if ((ifmam->ifmam_addrs & RTA_IFA) == 0)
					break;
				icnt++;
				p = (char *)(ifmam + 1);
				for (i = 0; i < RTAX_MAX; i++) {
					if ((RTA_MASKS & ifmam->ifmam_addrs &
						 (1 << i)) == 0)
						continue;
					sa = (struct sockaddr *)(void *)p;
					len = SA_RLEN(sa);
					dcnt += len;
					p += len;
				}
				break;
		}
	}

	data = malloc(sizeof(struct ifmaddrs) * icnt + dcnt);
	if (data == NULL) {
		free(buf);
		return (-1);
	}

	ifa = (struct ifmaddrs *)(void *)data;
	data += sizeof(struct ifmaddrs) * icnt;

	memset(ifa, 0, sizeof(struct ifmaddrs) * icnt);
	ift = ifa;

	for (next = buf; next < buf + needed; next += rtm->rtm_msglen) {
		rtm = (struct rt_msghdr *)(void *)next;
		if (rtm->rtm_version != RTM_VERSION)
			continue;

		switch (rtm->rtm_type) {
			case GIM_RTM_ADDR:
				ifmam = (struct ifma_msghdr2 *)(void *)rtm;
				if ((ifmam->ifmam_addrs & RTA_IFA) == 0)
					break;

				p = (char *)(ifmam + 1);
				for (i = 0; i < RTAX_MAX; i++) {
					if ((RTA_MASKS & ifmam->ifmam_addrs &
						 (1 << i)) == 0)
						continue;
					sa = (struct sockaddr *)(void *)p;
					len = SA_RLEN(sa);
					switch (i) {
						case RTAX_GATEWAY:
							ift->ifma_lladdr =
							(struct sockaddr *)(void *)data;
							memcpy(data, p, len);
							data += len;
							break;

						case RTAX_IFP:
							ift->ifma_name =
							(struct sockaddr *)(void *)data;
							memcpy(data, p, len);
							data += len;
							break;

						case RTAX_IFA:
							ift->ifma_addr =
							(struct sockaddr *)(void *)data;
							memcpy(data, p, len);
							data += len;
							break;

						default:
							data += len;
							break;
					}
					p += len;
				}
				ift->ifma_next = ift + 1;
				ift = ift->ifma_next;
				break;
		}
	}

	free(buf);

	if (ift > ifa) {
		ift--;
		ift->ifma_next = NULL;
		*pif = ifa;
	} else {
		*pif = NULL;
		free(ifa);
	}
	return (0);
}

void
freeifmaddrs(struct ifmaddrs *ifmp)
{
	free(ifmp);
}
Commit	Line	Data
e44d8d47 A	1	/*
	2	* Copyright (c) 2003 Bruce M. Simpson.
	3	* All rights reserved
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by Bruce M. Simpson.
	16	* 4. Neither the name of Bruce M. Simpson nor the names of other
	17	* contributors may be used to endorse or promote products derived
	18	* from this software without specific prior written permission.
	19	*
	20	* THIS SOFTWARE IS PROVIDED BY BRUCE M. SIMPSON AND AFFILIATES
	21	* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
	22	* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	23	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BRUCE M. SIMPSON OR CONTRIBUTORS
	24	* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	25	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	26	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	27	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	28	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	29	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	30	* POSSIBILITY OF SUCH DAMAGE.
	31	*/
	32
	33	#include <sys/cdefs.h>
	34	#include <sys/param.h>
	35	#include <sys/sysctl.h>
	36	#include <sys/ioctl.h>
	37	#include <sys/socket.h>
	38	#include <net/if.h>
	39	#include <net/if_dl.h>
	40	#include <net/route.h>
	41	#include <errno.h>
	42	#include <ifaddrs.h>
	43	#include <stdlib.h>
	44	#include <stdint.h>
	45	#include <string.h>
	46
	47	#define SALIGN (sizeof(uint32_t) - 1)
	48	#define SA_RLEN(sa) ((sa)->sa_len ? (((sa)->sa_len + SALIGN) & ~SALIGN) : \
	49	(SALIGN + 1))
	50	#define MAX_SYSCTL_TRY 5
	51	#define RTA_MASKS (RTA_GATEWAY \| RTA_IFP \| RTA_IFA)
	52
	53	/* FreeBSD uses NET_RT_IFMALIST and RTM_NEWMADDR from <sys/socket.h> */
	54	/* We can use NET_RT_IFLIST2 and RTM_NEWMADDR2 on Darwin */
	55	#define DARWIN_COMPAT
	56
	57	#ifdef DARWIN_COMPAT
	58	#define GIM_SYSCTL_MIB NET_RT_IFLIST2
	59	#define GIM_RTM_ADDR RTM_NEWMADDR2
	60	#else
	61	#define GIM_SYSCTL_MIB NET_RT_IFMALIST
	62	#define GIM_RTM_ADDR RTM_NEWMADDR
	63	#endif
	64
65	int
66	getifmaddrs(struct ifmaddrs **pif)
67	{
68	int icnt = 1;
69	int dcnt = 0;
70	int ntry = 0;
71	size_t len;
72	size_t needed;
73	int mib[6];
74	int i;
75	char *buf;
76	char *data;
77	char *next;
78	char *p;
79	struct ifma_msghdr2 *ifmam;
80	struct ifmaddrs ifa, ift;
81	struct rt_msghdr *rtm;
82	struct sockaddr *sa;
83
84	mib[0] = CTL_NET;
85	mib[1] = PF_ROUTE;
86	mib[2] = 0; /* protocol */
87	mib[3] = 0; /* wildcard address family */
88	mib[4] = GIM_SYSCTL_MIB;
89	mib[5] = 0; /* no flags */
90	do {
91	if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
92	return (-1);
93	if ((buf = malloc(needed)) == NULL)
94	return (-1);
95	if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
96	if (errno != ENOMEM \|\| ++ntry >= MAX_SYSCTL_TRY) {
97	free(buf);
98	return (-1);
99	}
100	free(buf);
101	buf = NULL;
102	}
103	} while (buf == NULL);
104
105	for (next = buf; next < buf + needed; next += rtm->rtm_msglen) {
106	rtm = (struct rt_msghdr )(void )next;
107	if (rtm->rtm_version != RTM_VERSION)
108	continue;
109	switch (rtm->rtm_type) {
110	case GIM_RTM_ADDR:
111	ifmam = (struct ifma_msghdr2 )(void )rtm;
112	if ((ifmam->ifmam_addrs & RTA_IFA) == 0)
113	break;
114	icnt++;
115	p = (char *)(ifmam + 1);
116	for (i = 0; i < RTAX_MAX; i++) {
117	if ((RTA_MASKS & ifmam->ifmam_addrs &
118	(1 << i)) == 0)
119	continue;
120	sa = (struct sockaddr )(void )p;
121	len = SA_RLEN(sa);
122	dcnt += len;
123	p += len;
124	}
125	break;
126	}
127	}
128
129	data = malloc(sizeof(struct ifmaddrs) * icnt + dcnt);
130	if (data == NULL) {
131	free(buf);
132	return (-1);
133	}
134
135	ifa = (struct ifmaddrs )(void )data;
136	data += sizeof(struct ifmaddrs) * icnt;
137
138	memset(ifa, 0, sizeof(struct ifmaddrs) * icnt);
139	ift = ifa;
140
141	for (next = buf; next < buf + needed; next += rtm->rtm_msglen) {
142	rtm = (struct rt_msghdr )(void )next;
143	if (rtm->rtm_version != RTM_VERSION)
144	continue;
145
146	switch (rtm->rtm_type) {
147	case GIM_RTM_ADDR:
148	ifmam = (struct ifma_msghdr2 )(void )rtm;
149	if ((ifmam->ifmam_addrs & RTA_IFA) == 0)
150	break;
151
152	p = (char *)(ifmam + 1);
153	for (i = 0; i < RTAX_MAX; i++) {
154	if ((RTA_MASKS & ifmam->ifmam_addrs &
155	(1 << i)) == 0)
156	continue;
157	sa = (struct sockaddr )(void )p;
158	len = SA_RLEN(sa);
159	switch (i) {
160	case RTAX_GATEWAY:
161	ift->ifma_lladdr =
162	(struct sockaddr )(void )data;
163	memcpy(data, p, len);
164	data += len;
165	break;
166
167	case RTAX_IFP:
168	ift->ifma_name =
169	(struct sockaddr )(void )data;
170	memcpy(data, p, len);
171	data += len;
172	break;
173
174	case RTAX_IFA:
175	ift->ifma_addr =
176	(struct sockaddr )(void )data;
177	memcpy(data, p, len);
178	data += len;
179	break;
180
181	default:
182	data += len;
183	break;
184	}
185	p += len;
186	}
187	ift->ifma_next = ift + 1;
188	ift = ift->ifma_next;
189	break;
190	}
191	}
192
193	free(buf);
194
195	if (ift > ifa) {
196	ift--;
197	ift->ifma_next = NULL;
198	*pif = ifa;
199	} else {
200	*pif = NULL;
201	free(ifa);
202	}
203	return (0);
204	}
205
206	void
207	freeifmaddrs(struct ifmaddrs *ifmp)
208	{
209	free(ifmp);
210	}