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import of dnsmasq-2.20.tar.gz

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This commit is contained in:
Simon Kelley
2005-01-23 12:06:08 +00:00
parent bb01cb9604
commit f6b7dc47c7
19 changed files with 906 additions and 438 deletions
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113
src/network.c
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@@ -1,4 +1,4 @@
/* dnsmasq is Copyright (c) 2000 - 2003 Simon Kelley
/* dnsmasq is Copyright (c) 2000 - 2005 Simon Kelley
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@@ -14,10 +14,9 @@
#include "dnsmasq.h"
static struct irec *add_iface(struct daemon *daemon, struct irec *list,
char *name, int is_loopback, union mysockaddr *addr)
static int iface_allowed(struct daemon *daemon, struct irec *iface,
char *name, int is_loopback, union mysockaddr *addr)
{
struct irec *iface;
struct iname *tmp;
/* If we are restricting the set of interfaces to use, make
@@ -45,12 +44,8 @@ static struct irec *add_iface(struct daemon *daemon, struct irec *list,
if (daemon->if_except)
for (tmp = daemon->if_except; tmp; tmp = tmp->next)
if (tmp->name && strcmp(tmp->name, name) == 0)
{
/* record address of named interfaces, for TCP access control */
tmp->addr = *addr;
return list;
}
return 0;
/* we may need to check the whitelist */
if (daemon->if_names || daemon->if_addrs)
{
@@ -58,36 +53,39 @@ static struct irec *add_iface(struct daemon *daemon, struct irec *list,
for (tmp = daemon->if_names; tmp; tmp = tmp->next)
if (tmp->name && (strcmp(tmp->name, name) == 0))
{
tmp->addr = *addr;
found = tmp->used = 1;
}
found = tmp->used = 1;
for (tmp = daemon->if_addrs; tmp; tmp = tmp->next)
if (sockaddr_isequal(&tmp->addr, addr))
found = tmp->used = 1;
if (!found)
return list;
return 0;
}
/* check whether the interface IP has been added already
it is possible to have multiple interfaces with the same address */
for (iface = list; iface; iface = iface->next)
for (; iface; iface = iface->next)
if (sockaddr_isequal(&iface->addr, addr))
break;
if (iface)
return list;
return 0;
/* If OK, add it to the head of the list */
iface = safe_malloc(sizeof(struct irec));
iface->addr = *addr;
iface->next = list;
return iface;
return 1;
}
/* This does two different jobs: if chainp is non-NULL, it puts
a list of all the interfaces allowed by config into *chainp.
If chainp is NULL, it returns 1 if addr is an address of an interface
allowed by config and if that address is IPv4, it fills in the
netmask of the interface.
If chainp is non-NULL, a zero return indicates a fatal error.
struct irec *enumerate_interfaces(struct daemon *daemon)
If chainp is NULL, errors result in a match failure and zero return.
*/
int enumerate_interfaces(struct daemon *daemon, struct irec **chainp,
union mysockaddr *test_addrp, struct in_addr *netmaskp)
{
#if defined(HAVE_LINUX_IPV6_PROC) && defined(HAVE_IPV6)
FILE *f;
@@ -100,9 +98,16 @@ struct irec *enumerate_interfaces(struct daemon *daemon)
int lastlen = 0;
int len = 20 * sizeof(struct ifreq);
int fd = socket(PF_INET, SOCK_DGRAM, 0);
struct in_addr netmask;
int ret = 0;
if (fd == -1)
die ("cannot create socket to enumerate interfaces: %s", NULL);
return 0;
#ifdef HAVE_IPV6
if (test_addrp && test_addrp->sa.sa_family == AF_INET6)
test_addrp->in6.sin6_flowinfo = htonl(0);
#endif
while (1)
{
@@ -113,7 +118,7 @@ struct irec *enumerate_interfaces(struct daemon *daemon)
if (ioctl(fd, SIOCGIFCONF, &ifc) < 0)
{
if (errno != EINVAL || lastlen != 0)
die ("ioctl error while enumerating interfaces: %s", NULL);
goto exit;
}
else
{
@@ -133,7 +138,7 @@ struct irec *enumerate_interfaces(struct daemon *daemon)
unaligned accesses. */
int ifr_len = ((struct ifreq *)ptr)->ifr_addr.sa_len + IF_NAMESIZE;
if (!(ifr = realloc(ifr, ifr_len)))
die("cannot allocate buffer", NULL);
goto exit;
memcpy(ifr, ptr, ifr_len);
ptr += ifr_len;
@@ -147,6 +152,9 @@ struct irec *enumerate_interfaces(struct daemon *daemon)
{
addr.in = *((struct sockaddr_in *) &ifr->ifr_addr);
addr.in.sin_port = htons(daemon->port);
if (ioctl(fd, SIOCGIFNETMASK, ifr) == -1)
goto exit;
netmask = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr;
}
#ifdef HAVE_IPV6
else if (ifr->ifr_addr.sa_family == AF_INET6)
@@ -164,9 +172,25 @@ struct irec *enumerate_interfaces(struct daemon *daemon)
continue; /* unknown address family */
if (ioctl(fd, SIOCGIFFLAGS, ifr) < 0)
die("ioctl error getting interface flags: %m", NULL);
goto exit;
iface = add_iface(daemon, iface, ifr->ifr_name, ifr->ifr_flags & IFF_LOOPBACK, &addr);
if (iface_allowed(daemon, iface, ifr->ifr_name, ifr->ifr_flags & IFF_LOOPBACK, &addr))
{
if (chainp)
{
struct irec *new = safe_malloc(sizeof(struct irec));
new->addr = addr;
new->netmask = netmask;
new->next = iface;
iface = new;
}
else if (sockaddr_isequal(&addr, test_addrp))
{
*netmaskp = netmask;
ret = 1;
goto exit;
}
}
}
#if defined(HAVE_LINUX_IPV6_PROC) && defined(HAVE_IPV6)
@@ -198,13 +222,35 @@ struct irec *enumerate_interfaces(struct daemon *daemon)
strncpy(sifr.ifr_name, devname, IF_NAMESIZE);
if (ioctl(fd, SIOCGIFFLAGS, &sifr) < 0)
die("ioctl error getting interface flags: %m", NULL);
iface = add_iface(daemon, iface, sifr.ifr_name, sifr.ifr_flags & IFF_LOOPBACK, &addr);
goto exit;
if (iface_allowed(daemon, iface, sifr.ifr_name, sifr.ifr_flags & IFF_LOOPBACK, &addr))
{
if (chainp)
{
struct irec *new = safe_malloc(sizeof(struct irec));
new->addr = addr;
new->next = iface;
iface = new;
}
else if (sockaddr_isequal(&addr, test_addrp))
{
ret = 1;
goto exit;
}
}
}
fclose(f);
}
#endif /* LINUX */
if (chainp)
{
*chainp = iface;
ret = 1;
}
exit:
if (buf)
free(buf);
#ifdef HAVE_SOCKADDR_SA_LEN
@@ -213,7 +259,7 @@ struct irec *enumerate_interfaces(struct daemon *daemon)
#endif
close(fd);
return iface;
return ret;
}
#ifdef HAVE_IPV6
@@ -354,6 +400,7 @@ struct listener *create_bound_listeners(struct irec *interfaces, int port)
{
struct listener *new = safe_malloc(sizeof(struct listener));
new->family = iface->addr.sa.sa_family;
new->iface = iface;
new->next = listeners;
if ((new->tcpfd = socket(iface->addr.sa.sa_family, SOCK_STREAM, 0)) == -1 ||
(new->fd = socket(iface->addr.sa.sa_family, SOCK_DGRAM, 0)) == -1 ||