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/* zodiac - advanced dns spoofer
*
* network primitives
*
* by scut / teso
*
* nearly all of this code wouldn't have been possible without w. richard stevens
* excellent network coding book. if you are interested in network coding,
* there is no way around it.
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <net/if.h>
#include <netinet/in.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "network.h"
int
net_parseip (char *inp, char **ip, unsigned short int *port)
{
int n;
if (inp == NULL)
return (0);
if (strchr (inp, ':') == NULL)
return (0);
*ip = calloc (1, 256);
if (*ip == NULL)
return (0);
n = sscanf (inp, "%[^:]:%hu", *ip, port);
if (n != 2)
return (0);
*ip = realloc (*ip, strlen (*ip) + 1);
if (*ip == NULL || (*port < 1 || *port > 65535))
return (0);
return (1);
}
char *
net_getlocalip (void)
{
struct sockaddr_in pf;
char name[255];
memset (name, '\0', sizeof (name));
if (gethostname (name, sizeof (name) - 1) == -1) {
return (NULL);
}
pf.sin_addr.s_addr = net_resolve (name);
return (strdup (inet_ntoa (pf.sin_addr)));;
}
void
net_ifi_free (struct ifi_info *tf)
{
struct ifi_info *ifi, *ifil;
ifil = NULL;
for (ifi = tf; ifi != NULL; ifi = ifi->ifi_next) {
if (ifil)
free (ifil);
if (ifi->ifi_addr)
free (ifi->ifi_addr);
ifil = ifi;
}
if (ifil)
free (ifil);
return;
}
struct ifi_info *
net_ifi_get (int family, int doaliases)
{
struct ifi_info *ifi, *ifihead, **ifipnext;
int sockfd, len, lastlen, flags, myflags;
char *ptr, *buf, lastname[IFNAMSIZ], *cptr;
struct ifconf ifc;
struct ifreq *ifr, ifrcopy;
struct sockaddr_in *sinptr;
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd == -1)
return (NULL);
lastlen = 0;
len = 100 * sizeof(struct ifreq);
for (;;) {
buf = malloc(len);
if (buf == NULL)
return (NULL);
ifc.ifc_len = len;
ifc.ifc_buf = buf;
if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
if (errno != EINVAL || lastlen != 0)
return (NULL);
} else {
if (ifc.ifc_len == lastlen)
break;
lastlen = ifc.ifc_len;
}
len += 10 * sizeof(struct ifreq);
free (buf);
}
ifihead = NULL;
ifipnext = &ifihead;
lastname[0] = 0;
for (ptr = buf; ptr < buf + ifc.ifc_len;) {
ifr = (struct ifreq *) ptr;
if (ifr->ifr_addr.sa_family == AF_INET)
len = sizeof(struct sockaddr);
ptr += sizeof(ifr->ifr_name) + len;
if (ifr->ifr_addr.sa_family != family)
continue;
myflags = 0;
if ((cptr = strchr(ifr->ifr_name, ':')) != NULL)
*cptr = 0;
if (strncmp(lastname, ifr->ifr_name, IFNAMSIZ) == 0) {
if (doaliases == 0)
continue;
myflags = IFI_ALIAS;
}
memcpy(lastname, ifr->ifr_name, IFNAMSIZ);
ifrcopy = *ifr;
if (ioctl(sockfd, SIOCGIFFLAGS, &ifrcopy) < 0)
return (NULL);
flags = ifrcopy.ifr_flags;
if ((flags & IFF_UP) == 0)
continue;
ifi = calloc(1, sizeof(struct ifi_info));
if (ifi == NULL)
return (NULL);
*ifipnext = ifi;
ifipnext = &ifi->ifi_next;
ifi->ifi_flags = flags;
ifi->ifi_myflags = myflags;
memcpy(ifi->ifi_name, ifr->ifr_name, IFI_NAME);
ifi->ifi_name[IFI_NAME - 1] = '\0';
#ifdef DEBUG
printf("got: %s\n", ifi->ifi_name);
#endif
switch (ifr->ifr_addr.sa_family) {
case AF_INET:
sinptr = (struct sockaddr_in *) &ifr->ifr_addr;
memcpy(&ifi->ifi_saddr, &sinptr->sin_addr, sizeof(struct in_addr));
if (ifi->ifi_addr == NULL) {
ifi->ifi_addr = calloc(1, sizeof(struct sockaddr_in));
if (ifi->ifi_addr == NULL)
return (NULL);
memcpy(ifi->ifi_addr, sinptr, sizeof(struct sockaddr_in));
}
break;
default:
break;
}
}
free (buf);
return (ifihead);
}
/* partly based on resolv routine from ?
*/
unsigned long int
net_resolve (char *host)
{
long i;
struct hostent *he;
if (host == NULL)
return (htonl (INADDR_ANY));
if (strcmp (host, "*") == 0)
return (htonl (INADDR_ANY));
i = inet_addr (host);
if (i == -1) {
he = gethostbyname (host);
if (he == NULL) {
return (0);
} else {
return (*(unsigned long *) he->h_addr);
}
}
return (i);
}
int
net_printipr (struct in_addr *ia, char *str, size_t len)
{
unsigned char *ipp;
ipp = (unsigned char *) &ia->s_addr;
snprintf (str, len - 1, "%d.%d.%d.%d", ipp[3], ipp[2], ipp[1], ipp[0]);
return (0);
}
int
net_printip (struct in_addr *ia, char *str, size_t len)
{
unsigned char *ipp;
ipp = (unsigned char *) &ia->s_addr;
snprintf (str, len - 1, "%d.%d.%d.%d", ipp[0], ipp[1], ipp[2], ipp[3]);
return (0);
}
int
net_printipa (struct in_addr *ia, char **str)
{
unsigned char *ipp;
ipp = (unsigned char *) &ia->s_addr;
*str = calloc (1, 256);
if (*str == NULL)
return (1);
snprintf (*str, 255, "%3d.%3d.%3d.%3d", ipp[0], ipp[1], ipp[2], ipp[3]);
*str = realloc (*str, strlen (*str) + 1);
return ((*str == NULL) ? 1 : 0);
}
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