pdnsd/src/netdev.c at master · github237/pdnsd · GitHub

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/* netdev.c - Test network devices for existence and status

This file is part of the pdnsd package.

pdnsd is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 3 of the License, or

(at your option) any later version.

pdnsd is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with pdnsd; see the file COPYING. If not, see

<http://www.gnu.org/licenses/>.

* Portions are under the following copyright and taken from FreeBSD

* (clause 3 deleted as it no longer applies):

* 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.

* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.

* @(#)if.h 8.1 (Berkeley) 6/10/93

* $FreeBSD: src/sys/net/if.h,v 1.58.2.1 2000/05/05 13:37:04 jlemon Exp $

#include <config.h>

#include "ipvers.h"

#include <sys/stat.h>

#include <sys/ioctl.h>

#include <net/if.h>

#include <netdb.h>

#include <string.h>

#include <unistd.h>

#include <stdio.h>

#include <ctype.h>

#include <errno.h>

#include <fcntl.h>

#include "helpers.h"

#include "netdev.h"

#include "error.h"

#if (TARGET==TARGET_BSD)

/* Taken from FreeBSD net/if.h rev. 1.58.2.1 */

#define SIZEOF_ADDR_IFREQ(ifr) \

((ifr).ifr_addr.sa_len > sizeof(struct sockaddr) ? \

(sizeof(struct ifreq) - sizeof(struct sockaddr) + \

(ifr).ifr_addr.sa_len) : sizeof(struct ifreq))

#elif (TARGET==TARGET_CYGWIN)

#define SIZEOF_ADDR_IFREQ(ifr) (sizeof(struct sockaddr))

#endif

#define MAX_SOCKETOPEN_ERRS 10

static volatile unsigned long socketopen_errs=0;

* Portions of the following code are Linux/FreeBSD specific.

* Please write interface-detection routines for other flavours of Unix if you can and want.

#if (TARGET==TARGET_LINUX) || (TARGET==TARGET_BSD) || (TARGET==TARGET_CYGWIN)

# if (TARGET==TARGET_LINUX)

static volatile unsigned long isdn_errs=0;

# ifdef ISDN_SUPPORT

* Test the status of an ippp interface. Taken from the isdn4k-utils (thanks!) and adapted

* by me (I love free software!)

* This will not work with older kernels.

* If your kernel is too old or too new, just try to get the status as uptest=exec command

* This will work, although slower.

# include <linux/isdn.h>

int statusif(char *name)

{

isdn_net_ioctl_phone phone;

int isdninfo,rc=0;

if ((isdninfo = open("/dev/isdninfo", O_RDONLY))<0) {

if (++isdn_errs<=2) {

log_warn("Could not open /dev/isdninfo for uptest: %s",strerror(errno));

}

return 0;

}

strncp(phone.name, name, sizeof(phone.name));

if (ioctl(isdninfo, IIOCNETGPN, &phone)==0)

rc=1;

close(isdninfo);

return rc;

}

# endif

* Test whether the network interface specified in ifname and its

* associated device specified in devname have locks owned by the

* same process.

int dev_up(char *ifname, char *devname)

{

FILE *fd;

int pidi, pidd, rv;

{

char path[sizeof("/var/run/.pid")+strlen(ifname)];

stpcpy(stpcpy(stpcpy(path,"/var/run/"),ifname),".pid");

if ((fd=fopen(path, "r")) == NULL )

return 0;

if (fscanf(fd, "%d", &pidi) != 1 ) {

fclose(fd) ;

return 0;

}

fclose(fd);

}

{

char path[sizeof("/var/lock/LCK..")+strlen(devname)];

stpcpy(stpcpy(path,"/var/lock/LCK.."),devname);

if ((fd=fopen(path, "r")) == NULL)

return 0;

if (fscanf(fd, "%d", &pidd) != 1) {

fclose(fd);

return 0;

}

fclose(fd);

}

if (pidi != pidd)

return 0;

/* Test whether pppd is still alive */

rv=kill(pidi,0);

return (rv==0 || (rv==-1 && errno!=ESRCH));

}

# endif /*(TARGET==TARGET_LINUX)*/

* Test whether the network device specified in devname is up and

* running (returns -1) or non-existent, down or not-running (returns 0)

* Note on IPv6-Comptability: rfc2133 requires all IPv6 implementation

* to be backwards-compatible to IPv4 in means of permitting socket(PF_INET,...)

* and similar. So, I don't put code here for both IPv4 and IPv6, since

* I use that socket only for ioctls. If somebody notices incompatabilities,

* please notify me.

int if_up(char *devname)

{

int sock;

struct ifreq ifr;

# if (TARGET==TARGET_LINUX)

unsigned int devnamelen=strlen(devname);

if (devnamelen>4 && devnamelen<=6 && strncmp(devname,"ippp",4)==0) {

/* This function didn't manage the interface uptest correctly. Thanks to

* Joachim Dorner for pointing out.

* The new code (statusif()) was shamelessly stolen from isdnctrl.c of the

* isdn4k-utils. */

# ifdef ISDN_SUPPORT

return statusif(devname);

# else

if (isdn_errs++==0) {

log_warn("An ippp? device was specified for uptest, but pdnsd was compiled without ISDN support.");

log_warn("The uptest result will be wrong.");

}

# endif

/* If it doesn't match our rules for isdn devices, treat as normal if */

}

# endif

if ((sock=socket(PF_INET,SOCK_DGRAM, IPPROTO_UDP))==-1) {

if(++socketopen_errs<=MAX_SOCKETOPEN_ERRS) {

log_warn("Could not open socket in if_up(): %s",strerror(errno));

}

return 0;

}

strncp(ifr.ifr_name,devname,IFNAMSIZ);

if (ioctl(sock,SIOCGIFFLAGS,&ifr)==-1) {

close(sock);

return 0;

}

close(sock);

return (ifr.ifr_flags&IFF_UP) && (ifr.ifr_flags&IFF_RUNNING);

}

# if (TARGET==TARGET_LINUX)

# ifdef ENABLE_IPV6

#define MAX_IF_INET6_OPEN_ERRS 10

static volatile unsigned long if_inet6_open_errs=0;

# endif

int is_local_addr(pdnsd_a *a)

{

int res=0;

# ifdef ENABLE_IPV4

if (run_ipv4) {

int i,sock;

struct ifreq ifr;

if ((sock=socket(PF_INET,SOCK_DGRAM, IPPROTO_UDP))==-1) {

if(++socketopen_errs<=MAX_SOCKETOPEN_ERRS) {

log_warn("Could not open socket in is_local_addr(): %s",strerror(errno));

}

return 0;

}

for (i=1;i<255;i++) {

ifr.ifr_ifindex=i;

if (ioctl(sock,SIOCGIFNAME,&ifr)==-1) {

/* There may be gaps in the interface enumeration, so just continue */

continue;

}

if (ioctl(sock,SIOCGIFADDR, &ifr)==-1) {

continue;

}

if (((struct sockaddr_in *)(&ifr.ifr_addr))->sin_addr.s_addr==a->ipv4.s_addr) {

res=1;

break;

}

close(sock);

}

# endif

# ifdef ENABLE_IPV6

ELSE_IPV6 {

char buf[40];

FILE *f;

struct in6_addr b;

/* the interface configuration and information retrieval is obiously currently done via

* rt-netlink sockets. I think it is relatively likely to change in an incompatible way the

* Linux kernel (there seem to be some major changes for 2.4).

* Right now, I just analyze the /proc/net/if_inet6 entry. This may not be the fastest, but

* should work and is easy to adapt should the format change. */

if (!(f=fopen("/proc/net/if_inet6","r"))) {

if(++if_inet6_open_errs<=MAX_IF_INET6_OPEN_ERRS) {

log_warn("Could not open /proc/net/if_inet6 in is_local_addr(): %s",strerror(errno));

}

return 0;

}

/* The address is at the start of the line. We just read 32 characters and insert a ':' 7

* times. Such, we can use inet_pton conveniently. More portable, that. */

for(;;) {

int i,ch; char *p=buf;

for (i=0;i<32;i++) {

if(i && i%4==0) *p++ = ':';

if ((ch=fgetc(f))==EOF)

goto fclose_return; /* we are at the end of the file and haven't found anything.*/

if(ch=='\n') goto nextline;

*p++ = ch;

}

*p=0;

if (inet_pton(AF_INET6,buf,&b) >0) {

if (IN6_ARE_ADDR_EQUAL(&b,&a->ipv6)) {

res=1;

goto fclose_return;

}

do {

if ((ch=fgetc(f))==EOF) goto fclose_return;

} while(ch!='\n');

nextline:;

}

fclose_return:

fclose(f);

}

# endif

return res;

}

# else /*(TARGET==TARGET_BSD) || (TARGET==TARGET_CYGWIN)*/

#define MAX_SIOCGIFCONF_ERRS 4

static volatile unsigned long siocgifconf_errs=0;

int is_local_addr(pdnsd_a *a)

{

int retval=0, sock, cnt;

struct ifconf ifc;

char buf[2048];

if ((sock=socket(PF_INET,SOCK_DGRAM, IPPROTO_UDP))==-1) {

if(++socketopen_errs<=MAX_SOCKETOPEN_ERRS) {

log_warn("Could not open socket in is_local_addr(): %s",strerror(errno));

}

return 0;

}

ifc.ifc_len=sizeof(buf);

ifc.ifc_buf=buf;

if (ioctl(sock,SIOCGIFCONF,&ifc)==-1) {

if(++siocgifconf_errs<=MAX_SIOCGIFCONF_ERRS) {

log_warn("ioctl() call with request SIOCGIFCONF failed in is_local_addr(): %s",strerror(errno));

}

goto close_sock_return;

}

cnt=0;

while(cnt+sizeof(struct ifreq)<=ifc.ifc_len) {

struct ifreq *ir= (struct ifreq *)(buf+cnt);

cnt += SIZEOF_ADDR_IFREQ(*ir);

if (cnt>ifc.ifc_len)

break;

if (SEL_IPVER(ir->ifr_addr.sa_family==AF_INET &&

((struct sockaddr_in *)&ir->ifr_addr)->sin_addr.s_addr==a->ipv4.s_addr,

ir->ifr_addr.sa_family==AF_INET6 &&

IN6_ARE_ADDR_EQUAL(&((struct sockaddr_in6 *)&ir->ifr_addr)->sin6_addr,

&a->ipv6)))

{

retval=1;

break;

}

close_sock_return:

close(sock);

return retval;

}

# endif

#else

# error "Huh. No OS macro defined."

#endif

pdnsd/src/netdev.c at master · github237/pdnsd · GitHub

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