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/* Rgethostbynam.c */
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#if defined(ISC)
#include <net/errno.h>
#endif /* #if defined(ISC) */
#include <stdio.h>
#include <netdb.h>
#include <syslog.h>
#if (defined(sun) && !defined(SOLARIS)) || defined(sgi)
#include <strings.h>
#else
#include <string.h>
#endif
#include "socks.h"
#if !defined(NULL)
#define NULL 0
#endif
extern int socks_useSyslog;
struct hostent socks_fakeIP[NUMFAKEIP];
static char *Fh_aliases[NUMFAKEIP], *Fh_addr_list[NUMFAKEIP*2];
static u_int32 F_iplist[NUMFAKEIP];
static struct hostent socks_Hostent[NUMHOSTENT];
static int initHostent()
{
int i;
char **faddr_list = Fh_addr_list;
for (i = 0; i < NUMFAKEIP; i++) {
socks_fakeIP[i].h_name = NULL;
Fh_aliases[i] = NULL;
socks_fakeIP[i].h_aliases = &Fh_aliases[i];
socks_fakeIP[i].h_addrtype = AF_INET;
socks_fakeIP[i].h_length = IPADDRLENG;
socks_fakeIP[i].h_addr_list = faddr_list;
*faddr_list++ = (char *)&F_iplist[i];
F_iplist[i] = htonl(i+1);
*faddr_list++ = 0;
}
for (i = 0; i < NUMHOSTENT; i++) {
socks_Hostent[i].h_name = NULL;
socks_Hostent[i].h_addrtype = AF_INET;
socks_Hostent[i].h_length = IPADDRLENG;
}
} /* initHostent */
struct hostent *Rgethostbyname(name)
char *name;
{
static int initdone = 0;
static int nextFIP = 0;
static int currentFIP = 0;
static int numFIP = 0;
struct hostent *hr, *hp;
int ipt, naliases, naddrs;
char *iplist = NULL;
char **iparray = NULL;
char *halist = NULL;
char **harray = NULL;
char **p;
char *q;
int i, cl;
static int nextHosetent = 0;
static int numHostent = 0;
static int currentHostent = 0;
if (initdone == 0) {
initHostent();
initdone = 1;
}
for (ipt = currentHostent, i = 0; i < numHostent; i++) {
hr = &socks_Hostent[ipt];
if (strcasecmp(hr->h_name, name) == 0)
return hr;
if (--ipt < 0)
ipt = NUMHOSTENT -1;
}
for (ipt = currentFIP, i = 0; i < numFIP; i++) {
hr = &socks_fakeIP[ipt];
if ( strcasecmp(hr->h_name, name) == 0)
return hr;
if (--ipt < 0)
ipt = NUMFAKEIP -1;
}
if ((hp = gethostbyname(name)) != NULL)
goto realIP;
/* Return hostent address of a fake IP */
if (++currentFIP >= NUMFAKEIP)
currentFIP = 0;
if (++numFIP >= NUMFAKEIP)
numFIP = NUMFAKEIP;
hr = &socks_fakeIP[currentFIP];
if (hr->h_name != NULL) {
free(hr->h_name);
}
if ((hr->h_name = strdup(name)) == NULL) {
goto out_of_memory;
}
return hr;
realIP:
/* Return hostent address of a real IP */
if (++currentHostent >= NUMHOSTENT)
currentHostent = 0;
if (++numHostent >= NUMHOSTENT)
numHostent = NUMHOSTENT;
hr = &socks_Hostent[currentHostent];
if (hr->h_name != NULL) {
free(hr->h_name);
harray = hr->h_aliases;
if (*harray != NULL)
free(*harray);
free(harray);
iparray = hr->h_addr_list;
free(*iparray);
free(iparray);
}
if ((hr->h_name = strdup(name)) == NULL) {
goto out_of_memory;
}
naliases = 1;
cl = 0;
for (p = hp->h_aliases; *p != NULL; p++) {
naliases++;
cl += (strlen(*p) +1);
}
if (cl > 0) {
if ((halist = (char *)malloc(cl)) == NULL) {
goto out_of_memory;
}
}
naddrs = 1;
for (p = hp->h_addr_list; *p != NULL; p++) {
naddrs++;
}
if (((harray = (char **)malloc(naliases * sizeof(iplist))) == NULL) ||
((iparray = (char **)malloc(naddrs * sizeof(iplist))) == NULL) ||
((iplist = (char *)malloc((naddrs - 1) * IPADDRLENG)) == NULL)) {
goto out_of_memory;
}
hr->h_aliases = harray;
for (p = hp->h_aliases; *p != NULL; p++) {
*harray++ = halist;
for (q = *p; *q != '\0'; )
*halist++ = *q++;
*halist++ = '\0';
}
*harray = NULL;
hr->h_addr_list = iparray;
for (p = hp->h_addr_list; *p != NULL; p++) {
*iparray++ = iplist;
q = *p;
*iplist++ = *q++;
*iplist++ = *q++;
*iplist++ = *q++;
*iplist++ = *q++;
}
*iparray = NULL;
return hr;
out_of_memory:
if(socks_useSyslog)
syslog(LOG_LOW, "Out of memory\n");
else
fprintf(stderr, "Out of memory\n");
exit(1);
}
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