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Diffstat (limited to 'sample/dns.c')
| -rw-r--r-- | sample/dns.c | 260 |
1 files changed, 260 insertions, 0 deletions
diff --git a/sample/dns.c b/sample/dns.c new file mode 100644 index 0000000..dec4bee --- /dev/null +++ b/sample/dns.c @@ -0,0 +1,260 @@ +/* + * + * libnet 1.1 + * Build a DNSv4 packet + * To view: /usr/sbin/tcpdump -vvvvven -s 0 port 53 + * + * Copyright (c) 2003 Frédéric Raynal <pappy@security-labs.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + */ + +#if (HAVE_CONFIG_H) +#include "../include/config.h" +#endif +#include "./libnet_test.h" +#ifdef __WIN32__ +#include "../include/win32/getopt.h" +#endif + +void +usage(char *prog) +{ + fprintf(stderr, "Usage: %s -d dst_ip -q query_host [-s src_ip] [-t]\n", prog); + exit(1); +} + + +int +main(int argc, char *argv[]) +{ + char c; + u_long src_ip = 0, dst_ip = 0; + u_short type = LIBNET_UDP_DNSV4_H; + libnet_t *l; + + libnet_ptag_t ip; + libnet_ptag_t ptag4; /* TCP or UDP ptag */ + libnet_ptag_t dns; + + char errbuf[LIBNET_ERRBUF_SIZE]; + char *query = NULL; + char payload[1024]; + u_short payload_s; + + printf("libnet 1.1 packet shaping: DNSv4[raw]\n"); + + /* + * Initialize the library. Root priviledges are required. + */ + l = libnet_init( + LIBNET_RAW4, /* injection type */ + NULL, /* network interface */ + errbuf); /* error buffer */ + + if (!l) + { + fprintf(stderr, "libnet_init: %s", errbuf); + exit(EXIT_FAILURE); + } + + /* + * parse options + */ + while ((c = getopt(argc, argv, "d:s:q:t")) != EOF) + { + switch (c) + { + + case 'd': + if ((dst_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1) + { + fprintf(stderr, "Bad destination IP address: %s\n", optarg); + exit(EXIT_FAILURE); + } + break; + case 's': + if ((src_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1) + { + fprintf(stderr, "Bad source IP address: %s\n", optarg); + exit(EXIT_FAILURE); + } + break; + case 'q': + query = optarg; + break; + case 't': + type = LIBNET_TCP_DNSV4_H; + break; + default: + exit(EXIT_FAILURE); + } + } + + if (!src_ip) + { + src_ip = libnet_get_ipaddr4(l); + } + + if (!dst_ip || !query) + { + usage(argv[0]); + exit(EXIT_FAILURE); + } + + /* + * build dns payload + */ + payload_s = snprintf(payload, sizeof payload, "%c%s%c%c%c%c%c", + (char)(strlen(query)&0xff), query, 0x00, 0x00, 0x01, 0x00, 0x01); + + /* + * build packet + */ + dns = libnet_build_dnsv4( + type, /* TCP or UDP */ + 0x7777, /* id */ + 0x0100, /* request */ + 1, /* num_q */ + 0, /* num_anws_rr */ + 0, /* num_auth_rr */ + 0, /* num_addi_rr */ + payload, + payload_s, + l, + 0 + ); + + if (dns == -1) + { + fprintf(stderr, "Can't build DNS packet: %s\n", libnet_geterror(l)); + goto bad; + } + + if (type == LIBNET_TCP_DNSV4_H) /* TCP DNS */ + { + ptag4 = libnet_build_tcp( + 0x6666, /* source port */ + 53, /* destination port */ + 0x01010101, /* sequence number */ + 0x02020202, /* acknowledgement num */ + TH_PUSH|TH_ACK, /* control flags */ + 32767, /* window size */ + 0, /* checksum */ + 0, /* urgent pointer */ + LIBNET_TCP_H + LIBNET_TCP_DNSV4_H + payload_s, /* TCP packet size */ + NULL, /* payload */ + 0, /* payload size */ + l, /* libnet handle */ + 0); /* libnet id */ + + if (ptag4 == -1) + { + fprintf(stderr, "Can't build UDP header: %s\n", libnet_geterror(l)); + goto bad; + } + + + ip = libnet_build_ipv4( + LIBNET_IPV4_H + LIBNET_TCP_H + type + payload_s,/* length */ + 0, /* TOS */ + 242, /* IP ID */ + 0, /* IP Frag */ + 64, /* TTL */ + IPPROTO_TCP, /* protocol */ + 0, /* checksum */ + src_ip, /* source IP */ + dst_ip, /* destination IP */ + NULL, /* payload */ + 0, /* payload size */ + l, /* libnet handle */ + 0); /* libnet id */ + + if (ip == -1) + { + fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l)); + exit(EXIT_FAILURE); + } + + } + else /* UDP DNS */ + { + ptag4 = libnet_build_udp( + 0x6666, /* source port */ + 53, /* destination port */ + LIBNET_UDP_H + LIBNET_UDP_DNSV4_H + payload_s, /* packet length */ + 0, /* checksum */ + NULL, /* payload */ + 0, /* payload size */ + l, /* libnet handle */ + 0); /* libnet id */ + + if (ptag4 == -1) + { + fprintf(stderr, "Can't build UDP header: %s\n", libnet_geterror(l)); + goto bad; + } + + + ip = libnet_build_ipv4( + LIBNET_IPV4_H + LIBNET_UDP_H + type + payload_s,/* length */ + 0, /* TOS */ + 242, /* IP ID */ + 0, /* IP Frag */ + 64, /* TTL */ + IPPROTO_UDP, /* protocol */ + 0, /* checksum */ + src_ip, /* source IP */ + dst_ip, /* destination IP */ + NULL, /* payload */ + 0, /* payload size */ + l, /* libnet handle */ + 0); /* libnet id */ + + if (ip == -1) + { + fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l)); + exit(EXIT_FAILURE); + } + } + + /* + * write to the wire + */ + c = libnet_write(l); + if (c == -1) + { + fprintf(stderr, "Write error: %s\n", libnet_geterror(l)); + goto bad; + } + else + { + fprintf(stderr, "Wrote %d byte DNS packet; check the wire.\n", c); + } + libnet_destroy(l); + return (EXIT_SUCCESS); + bad: + libnet_destroy(l); + return (EXIT_FAILURE); +} |