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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libc/net/getifaddrs.c	Lines:	132	152	86.8 %
Date:	2017-11-07	Branches:	63	92	68.5 %


/*	$OpenBSD: getifaddrs.c,v 1.13 2015/09/14 11:01:47 guenther Exp $	*/

/*
 * Copyright (c) 1995, 1999
 *	Berkeley Software Design, Inc.  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.
 *
 * THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``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 Berkeley Software Design, Inc. 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.
 *
 *	BSDI getifaddrs.c,v 2.12 2000/02/23 14:51:59 dab Exp
 */

#include <sys/param.h>	/* ALIGN */
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/route.h>
#include <sys/sysctl.h>
#include <net/if_dl.h>

#include <errno.h>
#include <ifaddrs.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#define	SALIGN	(sizeof(long) - 1)
#define	SA_RLEN(sa)	((sa)->sa_len ? (((sa)->sa_len + SALIGN) & ~SALIGN) : (SALIGN + 1))

int
getifaddrs(struct ifaddrs **pif)
{
	int icnt = 1;
	int dcnt = 0;
	int ncnt = 0;
	int mib[6];
	size_t needed;
	char *buf = NULL, *bufp;
	char *next;
	struct ifaddrs *cif = 0;
	char *p, *p0;
	struct rt_msghdr *rtm;
	struct if_msghdr *ifm;
	struct ifa_msghdr *ifam;
	struct sockaddr_dl *dl;
	struct sockaddr *sa;
	u_short index = 0;
	size_t len, alen, dlen;
	struct ifaddrs *ifa, *ift;
	int i;
	char *data;
	char *names;

	mib[0] = CTL_NET;
	mib[1] = PF_ROUTE;
	mib[2] = 0;             /* protocol */
	mib[3] = 0;             /* wildcard address family */
	mib[4] = NET_RT_IFLIST;
	mib[5] = 0;             /* no flags */
	while (1) {
		if (sysctl(mib, 6, NULL, &needed, NULL, 0) == -1) {
			free(buf);
			return (-1);
		}
		if (needed == 0)
			break;
		if ((bufp = realloc(buf, needed)) == NULL) {
			free(buf);
			return (-1);
		}
		buf = bufp;
		if (sysctl(mib, 6, buf, &needed, NULL, 0) == -1) {
			if (errno == ENOMEM)
				continue;
			free(buf);
			return (-1);
		}
		break;
	}

	for (next = buf; next < buf + needed; next += rtm->rtm_msglen) {
		rtm = (struct rt_msghdr *)next;
		if (rtm->rtm_version != RTM_VERSION)
			continue;
		switch (rtm->rtm_type) {
		case RTM_IFINFO:
			ifm = (struct if_msghdr *)rtm;
			if (ifm->ifm_addrs & RTA_IFP) {
				index = ifm->ifm_index;
				++icnt;
				dl = (struct sockaddr_dl *)(next +
				    rtm->rtm_hdrlen);
				dcnt += SA_RLEN((struct sockaddr *)dl) +
					ALIGNBYTES;
				dcnt += sizeof(ifm->ifm_data);
				ncnt += dl->sdl_nlen + 1;
			} else
				index = 0;
			break;

		case RTM_NEWADDR:
			ifam = (struct ifa_msghdr *)rtm;
			if (index && ifam->ifam_index != index)
				abort();	/* XXX abort illegal in library */

#define	RTA_MASKS	(RTA_NETMASK | RTA_IFA | RTA_BRD)
			if (index == 0 || (ifam->ifam_addrs & RTA_MASKS) == 0)
				break;
			p = next + rtm->rtm_hdrlen;
			++icnt;
			/* Scan to look for length of address */
			alen = 0;
			for (p0 = p, i = 0; i < RTAX_MAX; i++) {
				if ((RTA_MASKS & ifam->ifam_addrs & (1 << i))
				    == 0)
					continue;
				sa = (struct sockaddr *)p;
				len = SA_RLEN(sa);
				if (i == RTAX_IFA) {
					alen = len;
					break;
				}
				p += len;
			}
			for (p = p0, i = 0; i < RTAX_MAX; i++) {
				if ((RTA_MASKS & ifam->ifam_addrs & (1 << i))
				    == 0)
					continue;
				sa = (struct sockaddr *)p;
				len = SA_RLEN(sa);
				if (i == RTAX_NETMASK && sa->sa_len == 0)
					dcnt += alen;
				else
					dcnt += len;
				p += len;
			}
			break;
		}
	}

	if (icnt + dcnt + ncnt == 1) {
		*pif = NULL;
		free(buf);
		return (0);
	}
	data = malloc(sizeof(struct ifaddrs) * icnt + dcnt + ncnt);
	if (data == NULL) {
		free(buf);
		return(-1);
	}

	ifa = (struct ifaddrs *)data;
	data += sizeof(struct ifaddrs) * icnt;
	names = data + dcnt;

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

	index = 0;
	for (next = buf; next < buf + needed; next += rtm->rtm_msglen) {
		rtm = (struct rt_msghdr *)next;
		if (rtm->rtm_version != RTM_VERSION)
			continue;
		switch (rtm->rtm_type) {
		case RTM_IFINFO:
			ifm = (struct if_msghdr *)rtm;
			if (ifm->ifm_addrs & RTA_IFP) {
				index = ifm->ifm_index;
				dl = (struct sockaddr_dl *)(next +
				    rtm->rtm_hdrlen);

				cif = ift;
				ift->ifa_name = names;
				ift->ifa_flags = (int)ifm->ifm_flags;
				memcpy(names, dl->sdl_data, dl->sdl_nlen);
				names[dl->sdl_nlen] = 0;
				names += dl->sdl_nlen + 1;

				ift->ifa_addr = (struct sockaddr *)data;
				memcpy(data, dl,
				    ((struct sockaddr *)dl)->sa_len);
				data += SA_RLEN((struct sockaddr *)dl);

				/* ifm_data needs to be aligned */
				ift->ifa_data = data = (void *)ALIGN(data);
				dlen = rtm->rtm_hdrlen -
				    offsetof(struct if_msghdr, ifm_data);
				if (dlen > sizeof(ifm->ifm_data))
					dlen = sizeof(ifm->ifm_data);
				memcpy(data, &ifm->ifm_data, dlen);
 				data += sizeof(ifm->ifm_data);

				ift = (ift->ifa_next = ift + 1);
			} else
				index = 0;
			break;

		case RTM_NEWADDR:
			ifam = (struct ifa_msghdr *)rtm;
			if (index && ifam->ifam_index != index)
				abort();	/* XXX abort illegal in library */

			if (index == 0 || (ifam->ifam_addrs & RTA_MASKS) == 0)
				break;
			ift->ifa_name = cif->ifa_name;
			ift->ifa_flags = cif->ifa_flags;
			ift->ifa_data = NULL;
			p = next + rtm->rtm_hdrlen;
			/* Scan to look for length of address */
			alen = 0;
			for (p0 = p, i = 0; i < RTAX_MAX; i++) {
				if ((RTA_MASKS & ifam->ifam_addrs & (1 << i))
				    == 0)
					continue;
				sa = (struct sockaddr *)p;
				len = SA_RLEN(sa);
				if (i == RTAX_IFA) {
					alen = len;
					break;
				}
				p += len;
			}
			for (p = p0, i = 0; i < RTAX_MAX; i++) {
				if ((RTA_MASKS & ifam->ifam_addrs & (1 << i))
				    == 0)
					continue;
				sa = (struct sockaddr *)p;
				len = SA_RLEN(sa);
				switch (i) {
				case RTAX_IFA:
					ift->ifa_addr = (struct sockaddr *)data;
					memcpy(data, p, len);
					data += len;
					break;

				case RTAX_NETMASK:
					ift->ifa_netmask =
					    (struct sockaddr *)data;
					if (sa->sa_len == 0) {
						memset(data, 0, alen);
						data += alen;
						break;
					}
					memcpy(data, p, len);
					data += len;
					break;

				case RTAX_BRD:
					ift->ifa_broadaddr =
					    (struct sockaddr *)data;
					memcpy(data, p, len);
					data += len;
					break;
				}
				p += len;
			}


			ift = (ift->ifa_next = ift + 1);
			break;
		}
	}

	free(buf);
	if (--ift >= ifa) {
		ift->ifa_next = NULL;
		*pif = ifa;
	} else {
		*pif = NULL;
		free(ifa);
	}
	return (0);
}
DEF_WEAK(getifaddrs);

void
freeifaddrs(struct ifaddrs *ifp)
{
	free(ifp);
}
DEF_WEAK(freeifaddrs);


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: getifaddrs.c,v 1.13 2015/09/14 11:01:47 guenther Exp $ */
2
3			/*
4			* Copyright (c) 1995, 1999
5			* Berkeley Software Design, Inc. All rights reserved.
6			*
7			* Redistribution and use in source and binary forms, with or without
8			* modification, are permitted provided that the following conditions
9			* are met:
10			* 1. Redistributions of source code must retain the above copyright
11			* notice, this list of conditions and the following disclaimer.
12			*
13			* THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND
14			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16			* ARE DISCLAIMED. IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE
17			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23			* SUCH DAMAGE.
24			*
25			* BSDI getifaddrs.c,v 2.12 2000/02/23 14:51:59 dab Exp
26			*/
27
28			#include <sys/param.h> /* ALIGN */
29			#include <sys/types.h>
30			#include <sys/ioctl.h>
31			#include <sys/socket.h>
32			#include <net/if.h>
33			#include <net/route.h>
34			#include <sys/sysctl.h>
35			#include <net/if_dl.h>
36
37			#include <errno.h>
38			#include <ifaddrs.h>
39			#include <stddef.h>
40			#include <stdlib.h>
41			#include <string.h>
42			#include <unistd.h>
43
44			#define SALIGN (sizeof(long) - 1)
45			#define SA_RLEN(sa) ((sa)->sa_len ? (((sa)->sa_len + SALIGN) & ~SALIGN) : (SALIGN + 1))
46
47			int
48			getifaddrs(struct ifaddrs **pif)
49			{
50			int icnt = 1;
51			int dcnt = 0;
52			int ncnt = 0;
53		266	int mib[6];
54		133	size_t needed;
55			char buf = NULL, bufp;
56			char *next;
57			struct ifaddrs *cif = 0;
58			char p, p0;
59			struct rt_msghdr *rtm;
60			struct if_msghdr *ifm;
61			struct ifa_msghdr *ifam;
62			struct sockaddr_dl *dl;
63			struct sockaddr *sa;
64			u_short index = 0;
65			size_t len, alen, dlen;
66			struct ifaddrs ifa, ift;
67			int i;
68			char *data;
69			char *names;
70
71		133	mib[0] = CTL_NET;
72		133	mib[1] = PF_ROUTE;
73		133	mib[2] = 0; /* protocol */
74		133	mib[3] = 0; /* wildcard address family */
75		133	mib[4] = NET_RT_IFLIST;
76		133	mib[5] = 0; /* no flags */
77		133	while (1) {
78	✗✓	133	if (sysctl(mib, 6, NULL, &needed, NULL, 0) == -1) {
79			free(buf);
80			return (-1);
81			}
82	✓✗	133	if (needed == 0)
83			break;
84	✗✓	133	if ((bufp = realloc(buf, needed)) == NULL) {
85			free(buf);
86			return (-1);
87			}
88			buf = bufp;
89	✗✓	133	if (sysctl(mib, 6, buf, &needed, NULL, 0) == -1) {
90			if (errno == ENOMEM)
91			continue;
92			free(buf);
93			return (-1);
94			}
95			break;
96			}
97
98	✓✓	4326	for (next = buf; next < buf + needed; next += rtm->rtm_msglen) {
99		2030	rtm = (struct rt_msghdr *)next;
100	✓✗	2030	if (rtm->rtm_version != RTM_VERSION)
101			continue;
102	✓✓✓	4060	switch (rtm->rtm_type) {
103			case RTM_IFINFO:
104		1107	ifm = (struct if_msghdr *)rtm;
105	✓✗	1107	if (ifm->ifm_addrs & RTA_IFP) {
106		1107	index = ifm->ifm_index;
107		1107	++icnt;
108		1107	dl = (struct sockaddr_dl *)(next +
109		1107	rtm->rtm_hdrlen);
110	✓✗	3321	dcnt += SA_RLEN((struct sockaddr *)dl) +
111			ALIGNBYTES;
112		1107	dcnt += sizeof(ifm->ifm_data);
113		1107	ncnt += dl->sdl_nlen + 1;
114		1107	} else
115			index = 0;
116			break;
117
118			case RTM_NEWADDR:
119		923	ifam = (struct ifa_msghdr *)rtm;
120	✓✗✗✓	1846	if (index && ifam->ifam_index != index)
121			abort(); /* XXX abort illegal in library */
122
123			#define RTA_MASKS (RTA_NETMASK \| RTA_IFA \| RTA_BRD)
124	✓✗✓✗	1846	if (index == 0 \|\| (ifam->ifam_addrs & RTA_MASKS) == 0)
125			break;
126		923	p = next + rtm->rtm_hdrlen;
127		923	++icnt;
128			/* Scan to look for length of address */
129			alen = 0;
130	✓✗	11076	for (p0 = p, i = 0; i < RTAX_MAX; i++) {
131	✓✓	11076	if ((RTA_MASKS & ifam->ifam_addrs & (1 << i))
132		5538	== 0)
133			continue;
134		1846	sa = (struct sockaddr *)p;
135	✓✗	5538	len = SA_RLEN(sa);
136	✓✓	1846	if (i == RTAX_IFA) {
137			alen = len;
138		923	break;
139			}
140		923	p += len;
141		923	}
142	✓✓	29536	for (p = p0, i = 0; i < RTAX_MAX; i++) {
143	✓✓	27690	if ((RTA_MASKS & ifam->ifam_addrs & (1 << i))
144		13845	== 0)
145			continue;
146		2671	sa = (struct sockaddr *)p;
147	✓✓	7590	len = SA_RLEN(sa);
148	✓✓✗✓	3594	if (i == RTAX_NETMASK && sa->sa_len == 0)
149			dcnt += alen;
150			else
151		2671	dcnt += len;
152		2671	p += len;
153		2671	}
154			break;
155			}
156			}
157
158	✗✓	133	if (icnt + dcnt + ncnt == 1) {
159			*pif = NULL;
160			free(buf);
161			return (0);
162			}
163		133	data = malloc(sizeof(struct ifaddrs) * icnt + dcnt + ncnt);
164	✗✓	133	if (data == NULL) {
165			free(buf);
166			return(-1);
167			}
168
169		133	ifa = (struct ifaddrs *)data;
170		133	data += sizeof(struct ifaddrs) * icnt;
171		133	names = data + dcnt;
172
173		133	memset(ifa, 0, sizeof(struct ifaddrs) * icnt);
174			ift = ifa;
175
176			index = 0;
177	✓✓	4326	for (next = buf; next < buf + needed; next += rtm->rtm_msglen) {
178		2030	rtm = (struct rt_msghdr *)next;
179	✓✗	2030	if (rtm->rtm_version != RTM_VERSION)
180			continue;
181	✓✓✓	3137	switch (rtm->rtm_type) {
182			case RTM_IFINFO:
183		1107	ifm = (struct if_msghdr *)rtm;
184	✓✗	1107	if (ifm->ifm_addrs & RTA_IFP) {
185		1107	index = ifm->ifm_index;
186		1107	dl = (struct sockaddr_dl *)(next +
187		1107	rtm->rtm_hdrlen);
188
189			cif = ift;
190		1107	ift->ifa_name = names;
191		1107	ift->ifa_flags = (int)ifm->ifm_flags;
192		1107	memcpy(names, dl->sdl_data, dl->sdl_nlen);
193		1107	names[dl->sdl_nlen] = 0;
194		1107	names += dl->sdl_nlen + 1;
195
196		1107	ift->ifa_addr = (struct sockaddr *)data;
197		1107	memcpy(data, dl,
198		1107	((struct sockaddr *)dl)->sa_len);
199	✓✗	3321	data += SA_RLEN((struct sockaddr *)dl);
200
201			/* ifm_data needs to be aligned */
202		1107	ift->ifa_data = data = (void *)ALIGN(data);
203		1107	dlen = rtm->rtm_hdrlen -
204			offsetof(struct if_msghdr, ifm_data);
205		1107	if (dlen > sizeof(ifm->ifm_data))
206			dlen = sizeof(ifm->ifm_data);
207		1107	memcpy(data, &ifm->ifm_data, dlen);
208		1107	data += sizeof(ifm->ifm_data);
209
210		1107	ift = (ift->ifa_next = ift + 1);
211		1107	} else
212			index = 0;
213			break;
214
215			case RTM_NEWADDR:
216		923	ifam = (struct ifa_msghdr *)rtm;
217	✓✗✗✓	1846	if (index && ifam->ifam_index != index)
218			abort(); /* XXX abort illegal in library */
219
220	✓✗✓✗	1846	if (index == 0 \|\| (ifam->ifam_addrs & RTA_MASKS) == 0)
221			break;
222		923	ift->ifa_name = cif->ifa_name;
223		923	ift->ifa_flags = cif->ifa_flags;
224		923	ift->ifa_data = NULL;
225		923	p = next + rtm->rtm_hdrlen;
226			/* Scan to look for length of address */
227			alen = 0;
228	✓✗	11076	for (p0 = p, i = 0; i < RTAX_MAX; i++) {
229	✓✓	11076	if ((RTA_MASKS & ifam->ifam_addrs & (1 << i))
230		5538	== 0)
231			continue;
232		1846	sa = (struct sockaddr *)p;
233	✓✗	5538	len = SA_RLEN(sa);
234	✓✓	1846	if (i == RTAX_IFA) {
235			alen = len;
236		923	break;
237			}
238		923	p += len;
239		923	}
240	✓✓	29536	for (p = p0, i = 0; i < RTAX_MAX; i++) {
241	✓✓	27690	if ((RTA_MASKS & ifam->ifam_addrs & (1 << i))
242		13845	== 0)
243			continue;
244		2671	sa = (struct sockaddr *)p;
245	✓✓	10261	len = SA_RLEN(sa);
246	✓✓✓✓	5342	switch (i) {
247			case RTAX_IFA:
248		923	ift->ifa_addr = (struct sockaddr *)data;
249		923	memcpy(data, p, len);
250		923	data += len;
251		923	break;
252
253			case RTAX_NETMASK:
254		923	ift->ifa_netmask =
255		923	(struct sockaddr *)data;
256	✗✓	923	if (sa->sa_len == 0) {
257			memset(data, 0, alen);
258			data += alen;
259			break;
260			}
261		923	memcpy(data, p, len);
262		923	data += len;
263		923	break;
264
265			case RTAX_BRD:
266		825	ift->ifa_broadaddr =
267		825	(struct sockaddr *)data;
268		825	memcpy(data, p, len);
269		825	data += len;
270		825	break;
271			}
272		2671	p += len;
273		2671	}
274
275
276		923	ift = (ift->ifa_next = ift + 1);
277		923	break;
278			}
279			}
280
281		133	free(buf);
282	✓✗	133	if (--ift >= ifa) {
283		133	ift->ifa_next = NULL;
284		133	*pif = ifa;
285		133	} else {
286			*pif = NULL;
287			free(ifa);
288			}
289		133	return (0);
290		133	}
291			DEF_WEAK(getifaddrs);
292
293			void
294			freeifaddrs(struct ifaddrs *ifp)
295			{
296		266	free(ifp);
297		133	}
298			DEF_WEAK(freeifaddrs);