diff options
Diffstat (limited to 'libnet/src/libnet_build_icmp.c')
| -rw-r--r-- | libnet/src/libnet_build_icmp.c | 437 |
1 files changed, 437 insertions, 0 deletions
diff --git a/libnet/src/libnet_build_icmp.c b/libnet/src/libnet_build_icmp.c new file mode 100644 index 0000000..8db7f27 --- /dev/null +++ b/libnet/src/libnet_build_icmp.c @@ -0,0 +1,437 @@ +/* + * $Id: libnet_build_icmp.c,v 1.16 2004/03/29 17:24:34 mike Exp $ + * + * libnet + * libnet_build_icmp.c - ICMP packet assemblers + * + * Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com> + * 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 +#if (!(_WIN32) || (__CYGWIN__)) +#include "../include/libnet.h" +#else +#include "../include/win32/libnet.h" +#endif + +/* some common cruft for completing ICMP error packets */ +#define LIBNET_BUILD_ICMP_ERR_FINISH(len) \ +do \ +{ \ + n = libnet_pblock_append(l, p, (u_int8_t *)&icmp_hdr, len); \ + if (n == -1) \ + { \ + goto bad; \ + } \ + \ + if ((payload && !payload_s) || (!payload && payload_s)) \ + { \ + snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, \ + "%s(): payload inconsistency\n", __func__); \ + goto bad; \ + } \ + \ + if (payload && payload_s) \ + { \ + n = libnet_pblock_append(l, p, payload, payload_s); \ + if (n == -1) \ + { \ + goto bad; \ + } \ + } \ + \ + if (sum == 0) \ + { \ + libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM); \ + } \ +} while (0) + +libnet_ptag_t +libnet_build_icmpv4_echo(u_int8_t type, u_int8_t code, u_int16_t sum, +u_int16_t id, u_int16_t seq, u_int8_t *payload, u_int32_t payload_s, +libnet_t *l, libnet_ptag_t ptag) +{ + u_int32_t n, h; + libnet_pblock_t *p; + struct libnet_icmpv4_hdr icmp_hdr; + + if (l == NULL) + { + return (-1); + } + + n = LIBNET_ICMPV4_ECHO_H + payload_s; /* size of memory block */ + h = LIBNET_ICMPV4_ECHO_H + payload_s; /* hl for checksum */ + + /* + * Find the existing protocol block if a ptag is specified, or create + * a new one. + */ + p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_ICMPV4_ECHO_H); + if (p == NULL) + { + return (-1); + } + + memset(&icmp_hdr, 0, sizeof(icmp_hdr)); + icmp_hdr.icmp_type = type; /* packet type */ + icmp_hdr.icmp_code = code; /* packet code */ + icmp_hdr.icmp_sum = (sum ? htons(sum) : 0); /* checksum */ + icmp_hdr.icmp_id = htons(id); /* packet id */ + icmp_hdr.icmp_seq = htons(seq); /* packet seq */ + + n = libnet_pblock_append(l, p, (u_int8_t *)&icmp_hdr, LIBNET_ICMPV4_ECHO_H); + if (n == -1) + { + goto bad; + } + + if ((payload && !payload_s) || (!payload && payload_s)) + { + snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, + "%s(): payload inconsistency\n", __func__); + goto bad; + } + + if (payload && payload_s) + { + n = libnet_pblock_append(l, p, payload, payload_s); + if (n == -1) + { + goto bad; + } + } + + if (sum == 0) + { + /* + * If checksum is zero, by default libnet will compute a checksum + * for the user. The programmer can override this by calling + * libnet_toggle_checksum(l, ptag, 1); + */ + libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM); + } + return (ptag ? ptag : libnet_pblock_update(l, p, h, + LIBNET_PBLOCK_ICMPV4_ECHO_H)); +bad: + libnet_pblock_delete(l, p); + return (-1); +} + +libnet_ptag_t +libnet_build_icmpv4_mask(u_int8_t type, u_int8_t code, u_int16_t sum, +u_int16_t id, u_int16_t seq, u_int32_t mask, u_int8_t *payload, +u_int32_t payload_s, libnet_t *l, libnet_ptag_t ptag) +{ + u_int32_t n, h; + libnet_pblock_t *p; + struct libnet_icmpv4_hdr icmp_hdr; + + if (l == NULL) + { + return (-1); + } + + n = LIBNET_ICMPV4_MASK_H + payload_s; /* size of memory block */ + h = LIBNET_ICMPV4_MASK_H + payload_s; /* hl for checksum */ + + /* + * Find the existing protocol block if a ptag is specified, or create + * a new one. + */ + p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_ICMPV4_MASK_H); + if (p == NULL) + { + return (-1); + } + + memset(&icmp_hdr, 0, sizeof(icmp_hdr)); + icmp_hdr.icmp_type = type; /* packet type */ + icmp_hdr.icmp_code = code; /* packet code */ + icmp_hdr.icmp_sum = (sum ? htons(sum) : 0); /* checksum */ + icmp_hdr.icmp_id = htons(id); /* packet id */ + icmp_hdr.icmp_seq = htons(seq); /* packet seq */ + icmp_hdr.icmp_mask = htonl(mask); /* address mask */ + + n = libnet_pblock_append(l, p, (u_int8_t *)&icmp_hdr, LIBNET_ICMPV4_MASK_H); + if (n == -1) + { + goto bad; + } + + if ((payload && !payload_s) || (!payload && payload_s)) + { + snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, + "%s(): payload inconsistency\n", __func__); + goto bad; + } + + if (payload && payload_s) + { + n = libnet_pblock_append(l, p, payload, payload_s); + if (n == -1) + { + goto bad; + } + } + + if (sum == 0) + { + /* + * If checksum is zero, by default libnet will compute a checksum + * for the user. The programmer can override this by calling + * libnet_toggle_checksum(l, ptag, 1); + */ + libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM); + } + return (ptag ? ptag : libnet_pblock_update(l, p, h, + LIBNET_PBLOCK_ICMPV4_MASK_H)); +bad: + libnet_pblock_delete(l, p); + return (-1); +} + +libnet_ptag_t +libnet_build_icmpv4_timestamp(u_int8_t type, u_int8_t code, u_int16_t sum, +u_int16_t id, u_int16_t seq, n_time otime, n_time rtime, n_time ttime, +u_int8_t *payload, u_int32_t payload_s, libnet_t *l, libnet_ptag_t ptag) +{ + u_int32_t n, h; + libnet_pblock_t *p; + struct libnet_icmpv4_hdr icmp_hdr; + + if (l == NULL) + { + return (-1); + } + + n = LIBNET_ICMPV4_TS_H + payload_s; /* size of memory block */ + h = LIBNET_ICMPV4_TS_H + payload_s; /* hl for checksum */ + + /* + * Find the existing protocol block if a ptag is specified, or create + * a new one. + */ + p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_ICMPV4_TS_H); + if (p == NULL) + { + return (-1); + } + + memset(&icmp_hdr, 0, sizeof(icmp_hdr)); + icmp_hdr.icmp_type = type; /* packet type */ + icmp_hdr.icmp_code = code; /* packet code */ + icmp_hdr.icmp_sum = (sum ? htons(sum) : 0); /* checksum */ + icmp_hdr.icmp_id = htons(id); /* packet id */ + icmp_hdr.icmp_seq = htons(seq); /* packet seq */ + icmp_hdr.icmp_otime = htonl(otime); /* original timestamp */ + icmp_hdr.icmp_rtime = htonl(rtime); /* receive timestamp */ + icmp_hdr.icmp_ttime = htonl(ttime); /* transmit timestamp */ + + n = libnet_pblock_append(l, p, (u_int8_t *)&icmp_hdr, LIBNET_ICMPV4_TS_H); + if (n == -1) + { + goto bad; + } + + if ((payload && !payload_s) || (!payload && payload_s)) + { + snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, + "%s(): payload inconsistency\n", __func__); + goto bad; + } + + if (payload && payload_s) + { + n = libnet_pblock_append(l, p, payload, payload_s); + if (n == -1) + { + goto bad; + } + } + + if (sum == 0) + { + /* + * If checksum is zero, by default libnet will compute a checksum + * for the user. The programmer can override this by calling + * libnet_toggle_checksum(l, ptag, 1); + */ + libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM); + } + return (ptag ? ptag : libnet_pblock_update(l, p, h, + LIBNET_PBLOCK_ICMPV4_TS_H)); +bad: + libnet_pblock_delete(l, p); + return (-1); +} + +libnet_ptag_t +libnet_build_icmpv4_unreach(u_int8_t type, u_int8_t code, u_int16_t sum, +u_int8_t *payload, u_int32_t payload_s, libnet_t *l, libnet_ptag_t ptag) +{ + u_int32_t n, h; + libnet_pblock_t *p; + struct libnet_icmpv4_hdr icmp_hdr; + + if (l == NULL) + { + return (-1); + } + n = LIBNET_ICMPV4_UNREACH_H + payload_s; /* size of memory block */ + + /* + * FREDRAYNAL: as ICMP checksum includes what is embedded in + * the payload, and what is after the ICMP header, we need to include + * those 2 sizes. + */ + h = LIBNET_ICMPV4_UNREACH_H + payload_s + l->total_size; + + /* + * Find the existing protocol block if a ptag is specified, or create + * a new one. + */ + p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_ICMPV4_UNREACH_H); + if (p == NULL) + { + return (-1); + } + + memset(&icmp_hdr, 0, sizeof(icmp_hdr)); + icmp_hdr.icmp_type = type; /* packet type */ + icmp_hdr.icmp_code = code; /* packet code */ + icmp_hdr.icmp_sum = (sum ? htons(sum) : 0); /* checksum */ + icmp_hdr.icmp_id = 0; /* must be 0 */ + icmp_hdr.icmp_seq = 0; /* must be 0 */ + + LIBNET_BUILD_ICMP_ERR_FINISH(LIBNET_ICMPV4_UNREACH_H); + + return (ptag ? ptag : libnet_pblock_update(l, p, h, + LIBNET_PBLOCK_ICMPV4_UNREACH_H)); +bad: + libnet_pblock_delete(l, p); + return (-1); +} + +libnet_ptag_t +libnet_build_icmpv4_timeexceed(u_int8_t type, u_int8_t code, u_int16_t sum, +u_int8_t *payload, u_int32_t payload_s, libnet_t *l, libnet_ptag_t ptag) +{ + u_int32_t n, h; + libnet_pblock_t *p; + struct libnet_icmpv4_hdr icmp_hdr; + + if (l == NULL) + { + return (-1); + } + + /* size of memory block */ + n = LIBNET_ICMPV4_TIMXCEED_H; + /* + * FREDRAYNAL: as ICMP checksum includes what is embedded in + * the payload, and what is after the ICMP header, we need to include + * those 2 sizes. + */ + h = LIBNET_ICMPV4_TIMXCEED_H + payload_s + l->total_size; + + /* + * Find the existing protocol block if a ptag is specified, or create + * a new one. + */ + p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_ICMPV4_TIMXCEED_H); + if (p == NULL) + { + return (-1); + } + + memset(&icmp_hdr, 0, sizeof(icmp_hdr)); + icmp_hdr.icmp_type = type; /* packet type */ + icmp_hdr.icmp_code = code; /* packet code */ + icmp_hdr.icmp_sum = (sum ? htons(sum) : 0); /* checksum */ + icmp_hdr.icmp_id = 0; /* must be 0 */ + icmp_hdr.icmp_seq = 0; /* must be 0 */ + + LIBNET_BUILD_ICMP_ERR_FINISH(LIBNET_ICMPV4_TIMXCEED_H); + + return (ptag ? ptag : libnet_pblock_update(l, p, h, + LIBNET_PBLOCK_ICMPV4_TIMXCEED_H)); +bad: + libnet_pblock_delete(l, p); + return (-1); +} + +libnet_ptag_t +libnet_build_icmpv4_redirect(u_int8_t type, u_int8_t code, u_int16_t sum, +u_int32_t gateway, u_int8_t *payload, u_int32_t payload_s, libnet_t *l, +libnet_ptag_t ptag) + +{ + u_int32_t n, h; + libnet_pblock_t *p; + struct libnet_icmpv4_hdr icmp_hdr; + + if (l == NULL) + { + return (-1); + } + + n = LIBNET_ICMPV4_REDIRECT_H; /* size of memory block */ + /* + * FREDRAYNAL: as ICMP checksum includes what is embedded in + * the payload, and what is after the ICMP header, we need to include + * those 2 sizes. + */ + h = LIBNET_ICMPV4_REDIRECT_H + payload_s + l->total_size; + + /* + * Find the existing protocol block if a ptag is specified, or create + * a new one. + */ + p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_ICMPV4_REDIRECT_H); + if (p == NULL) + { + return (-1); + } + + memset(&icmp_hdr, 0, sizeof(icmp_hdr)); + icmp_hdr.icmp_type = type; /* packet type */ + icmp_hdr.icmp_code = code; /* packet code */ + icmp_hdr.icmp_sum = (sum ? htons(sum) : 0); /* checksum */ + icmp_hdr.hun.gateway = gateway; + + LIBNET_BUILD_ICMP_ERR_FINISH(LIBNET_ICMPV4_REDIRECT_H); + + return (ptag ? ptag : libnet_pblock_update(l, p, h, + LIBNET_PBLOCK_ICMPV4_REDIRECT_H)); +bad: + libnet_pblock_delete(l, p); + return (-1); +} + +/* EOF */ |