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/*
* Copyright (C) 2002 Michel Arboi
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* TCP/IP service functions (getservent enhancement)
*/
#define EXPORTING
#include <includes.h>
#include <stdarg.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#ifndef MAP_FAILED
#define MAP_FAILED ((void*)-1)
#endif
#include "services.h"
#include "libnessus.h"
/* IMPORTANT ! Some options are defined in services.h */
static int
cmp_ns_svc(const void *v1,
const void *v2)
{
const struct nessus_service * p1 = v1;
const struct nessus_service * p2 = v2;
if(v1 == NULL)
return 1;
else if(v2 == NULL)
return -1;
return p1->ns_port - p2->ns_port;
}
ExtFunc const char*
nessus_get_svc_name(int port, const char* proto)
{
static struct nessus_service *svc_db_ptr[2] = { NULL, NULL };
static int nb_svc[2];
int fd = -1, len, idx;
struct stat st;
struct nessus_service *pns, kns;
struct servent *svc;
if (proto != NULL && strcmp(proto, "udp") == 0)
idx = 1;
else
idx = 0; /* default to TCP */
if (svc_db_ptr[idx] == NULL)
{
if ((fd = open(idx ? NESSUS_SERVICES_UDP : NESSUS_SERVICES_TCP, O_RDONLY)) >= 0)
{
if (fstat(fd, &st) < 0)
perror("fstat");
else
{
len = st.st_size;
nb_svc[idx] = len / sizeof(struct nessus_service);
if ((svc_db_ptr[idx] = mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0))== MAP_FAILED )
{
perror("mmap");
svc_db_ptr[idx] = NULL;
}
}
}
}
if (svc_db_ptr[idx] == NULL)
{
if (fd > 0)
close(fd);
}
else
{
kns.ns_port = port;
pns = bsearch(&kns, svc_db_ptr[idx], nb_svc[idx], sizeof(kns), cmp_ns_svc);
if (pns != NULL)
return pns->ns_name;
#ifdef NESSUS_SVC_READS_ETC_SERVICES
else
return "unknown";
#endif
}
setservent(1); /* Rewinds /etc/services and keep the file open */
svc = getservbyport(htons((unsigned short) port), proto);
if (svc == NULL)
return "unknown";
else
return svc->s_name;
}
ExtFunc unsigned short * get_tcp_svcs(int * num)
{
struct nessus_service * ns = NULL;
int len, num_svc;
unsigned short * ret;
int fd, i;
struct stat st;
if ((fd = open(NESSUS_SERVICES_TCP, O_RDONLY)) >= 0)
{
if (fstat(fd, &st) < 0)
perror("fstat");
else
{
len = st.st_size;
num_svc = len / sizeof(struct nessus_service);
if ((ns = mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0))== MAP_FAILED ) {
perror("mmap");
ns = NULL;
}
}
}
if (ns == NULL)
{
struct servent * ent;
int n = 0;
ret = emalloc(sizeof(unsigned short) * 65537);
endservent();
while ( (ent = getservent()) != NULL )
{
if(strcmp(ent->s_proto, "tcp") == 0 && ntohs(ent->s_port))
{
ret[n++] = ntohs(ent->s_port);
if(n >= 65537)break;
}
}
endservent();
if(num != NULL)
*num = n;
ret = erealloc(ret, sizeof(unsigned short) * (n+1));
ret[n] = 0;
return ret;
}
else
{
ret = emalloc(sizeof(unsigned short) * (num_svc + 1));
for(i=0;i<num_svc;i++)
{
ret[i] = ns[i].ns_port;
}
if(num != NULL)
*num = num_svc;
munmap(ns, len);
close(fd);
}
return ret;
}
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