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elinks/src/osdep/getifaddrs.c

337 lines
7.8 KiB
C

/* Provide stub function getifaddrs(). */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifndef HAVE_GETIFADDRS
/* Downloaded from http://ftp.uninett.no/pub/OpenBSD/src/kerberosV/src/lib/roken/getifaddrs.c */
/*
* Copyright (c) 2000 - 2001 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* 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. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 THE INSTITUTE 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.
*/
/* ELinksification and improvement of alloc failure handling by Zas.
* This file was borrowed from dkftpbench-0.45 sources (http://www.kegel.com/dkftpbench). */
#include <errno.h>
#include <sys/types.h> /* SunOS needs this before net/if.h */
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h> /* SunOS needs this before net/if.h, and need to be after sys/types.h */
#endif
#ifdef HAVE_NET_IF_H
#include <net/if.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_NETINET_IN6_VAR_H
#include <netinet/in6_var.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h> /* OS/2 needs this after sys/types.h */
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_SOCKIO_H
#include <sys/sockio.h>
#endif
#include "elinks.h"
#include "osdep/osdep.h"
#include "osdep/getifaddrs.h"
#if (defined(PF_INET6) && defined(SIOCGIF6CONF) && defined(SIOCGIF6FLAGS)) \
|| (defined(PF_INET) && defined(SIOCGIFCONF) && defined(SIOCGIFFLAGS)) \
|| (defined(CONFIG_IPV6) && defined(SIOCGIFCONF))
static int
getifaddrs2(struct ifaddrs **ifap,
int pf, int siocgifconf, int siocgifflags, size_t ifreq_sz)
{
struct sockaddr sa_zero;
struct ifreq *ifr;
struct ifaddrs *start;
struct ifaddrs **end = &start;
struct ifconf ifconf;
char *p;
char *buf = NULL;
size_t buf_size;
size_t sz;
int ret;
int fd;
int num, j = 0;
memset(&sa_zero, 0, sizeof(sa_zero));
fd = socket(pf, SOCK_DGRAM, 0);
if (fd < 0)
return -1;
buf_size = 8192;
for (;;) {
buf = calloc(1, buf_size);
if (buf == NULL) {
ret = ENOMEM;
goto error_out;
}
ifconf.ifc_len = buf_size;
ifconf.ifc_buf = buf;
/*
* Solaris returns EINVAL when the buffer is too small.
*/
if (ioctl(fd, siocgifconf, &ifconf) < 0 && errno != EINVAL) {
ret = errno;
goto error_out;
}
/*
* Can the difference between a full and a overfull buf
* be determined?
*/
if (ifconf.ifc_len < (int) buf_size)
break;
free(buf);
buf_size *= 2;
}
num = ifconf.ifc_len / ifreq_sz;
j = 0;
for (p = ifconf.ifc_buf; p < ifconf.ifc_buf + ifconf.ifc_len; p += sz) {
struct ifreq ifreq;
struct sockaddr *sa;
size_t salen;
void *tmp_end, *tmp_name, *tmp_addr;
ifr = (struct ifreq *) p;
sa = &ifr->ifr_addr;
sz = ifreq_sz;
salen = sizeof(*sa);
#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
salen = sa->sa_len;
sz = int_max(sz, sizeof(ifr->ifr_name) + sa->sa_len);
#endif
#ifdef SA_LEN
salen = SA_LEN(sa);
sz = int_max(sz, sizeof(ifr->ifr_name) + SA_LEN(sa));
#endif
memset(&ifreq, 0, sizeof(ifreq));
memcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifr->ifr_name));
if (ioctl(fd, siocgifflags, &ifreq) < 0) {
ret = errno;
goto error_out;
}
tmp_end = malloc(sizeof(**end));
if (!tmp_end) {
ret = ENOMEM;
goto error_out;
}
tmp_name = strdup(ifr->ifr_name);
if (!tmp_name) {
free(tmp_end);
ret = ENOMEM;
goto error_out;
}
tmp_addr = malloc(salen);
if (!tmp_addr) {
free(tmp_end);
free(tmp_name);
ret = ENOMEM;
goto error_out;
}
*end = tmp_end;
(*end)->ifa_next = NULL;
(*end)->ifa_name = tmp_name;
(*end)->ifa_flags = ifreq.ifr_flags;
(*end)->ifa_addr = tmp_addr;
memcpy((*end)->ifa_addr, sa, salen);
(*end)->ifa_netmask = NULL;
#if 0
/* fix these when we actually need them */
if (ifreq.ifr_flags & IFF_BROADCAST) {
(*end)->ifa_broadaddr =
malloc(sizeof(ifr->ifr_broadaddr));
memcpy((*end)->ifa_broadaddr, &ifr->ifr_broadaddr,
sizeof(ifr->ifr_broadaddr));
} else if (ifreq.ifr_flags & IFF_POINTOPOINT) {
(*end)->ifa_dstaddr = malloc(sizeof(ifr->ifr_dstaddr));
memcpy((*end)->ifa_dstaddr, &ifr->ifr_dstaddr,
sizeof(ifr->ifr_dstaddr));
} else
(*end)->ifa_dstaddr = NULL;
#else
(*end)->ifa_dstaddr = NULL;
#endif
(*end)->ifa_data = NULL;
end = &(*end)->ifa_next;
}
*ifap = start;
close(fd);
free(buf);
return 0;
error_out:
close(fd);
if (buf) free(buf);
errno = ret;
return -1;
}
#endif
int
getifaddrs(struct ifaddrs **ifap)
{
int ret = -1;
errno = ENXIO;
#if defined(PF_INET6) && defined(SIOCGIF6CONF) && defined(SIOCGIF6FLAGS)
if (ret)
ret = getifaddrs2(ifap, PF_INET6, SIOCGIF6CONF, SIOCGIF6FLAGS,
sizeof(struct in6_ifreq));
#endif
#if defined(CONFIG_IPV6) && defined(SIOCGIFCONF)
if (ret)
ret = getifaddrs2(ifap, PF_INET6, SIOCGIFCONF, SIOCGIFFLAGS,
sizeof(struct ifreq));
#endif
#if defined(PF_INET) && defined(SIOCGIFCONF) && defined(SIOCGIFFLAGS)
if (ret)
ret = getifaddrs2(ifap, PF_INET, SIOCGIFCONF, SIOCGIFFLAGS,
sizeof(struct ifreq));
#endif
return ret;
}
void
freeifaddrs(struct ifaddrs *ifp)
{
struct ifaddrs *p, *q;
for (p = ifp; p;) {
free(p->ifa_name);
if (p->ifa_addr)
free(p->ifa_addr);
if (p->ifa_dstaddr)
free(p->ifa_dstaddr);
if (p->ifa_netmask)
free(p->ifa_netmask);
if (p->ifa_data)
free(p->ifa_data);
q = p;
p = p->ifa_next;
free(q);
}
}
#ifdef TEST_GETIFADDRS
void
print_addr(const char *s, struct sockaddr *sa)
{
int i;
printf(" %s=%d/", s, sa->sa_family);
#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
for (i = 0;
i < sa->sa_len - ((long) sa->sa_data - (long) &sa->sa_family); i++)
printf("%02x", ((unsigned char *) sa->sa_data)[i]);
#else
for (i = 0; i < sizeof(sa->sa_data); i++)
printf("%02x", ((unsigned char *) sa->sa_data)[i]);
#endif
printf("\n");
}
void
print_ifaddrs(struct ifaddrs *x)
{
struct ifaddrs *p;
for (p = x; p; p = p->ifa_next) {
printf("%s\n", p->ifa_name);
printf(" flags=%x\n", p->ifa_flags);
if (p->ifa_addr)
print_addr("addr", p->ifa_addr);
if (p->ifa_dstaddr)
print_addr("dstaddr", p->ifa_dstaddr);
if (p->ifa_netmask)
print_addr("netmask", p->ifa_netmask);
printf(" %p\n", p->ifa_data);
}
}
int
main()
{
struct ifaddrs *a = NULL, *b;
getifaddrs2(&a, PF_INET, SIOCGIFCONF, SIOCGIFFLAGS,
sizeof(struct ifreq));
print_ifaddrs(a);
printf("---\n");
getifaddrs(&b);
print_ifaddrs(b);
return 0;
}
#endif /* TEST_GETIFADDRS */
#endif /* HAVE_GETIFADDRS */