diff options
Diffstat (limited to 'libnet/src/libnet_build_stp.c')
| -rw-r--r-- | libnet/src/libnet_build_stp.c | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/libnet/src/libnet_build_stp.c b/libnet/src/libnet_build_stp.c new file mode 100644 index 0000000..7d70f15 --- /dev/null +++ b/libnet/src/libnet_build_stp.c @@ -0,0 +1,222 @@ +/* + * $Id: libnet_build_stp.c,v 1.8 2004/01/15 20:11:15 mike Exp $ + * + * libnet + * libnet_build_stp.c - STP packet assembler + * + * 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 + +libnet_ptag_t +libnet_build_stp_conf(u_int16_t id, u_int8_t version, u_int8_t bpdu_type, +u_int8_t flags, u_int8_t *root_id, u_int32_t root_pc, u_int8_t *bridge_id, +u_int16_t port_id, u_int16_t message_age, u_int16_t max_age, +u_int16_t hello_time, u_int16_t f_delay, 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; + + /* until we get some data marshalling in place we can't use this */ + /* struct libnet_stp_conf_hdr stp_hdr; */ + u_int8_t stp_hdr[35]; + u_int16_t value_s; + u_int32_t value_l; + + if (l == NULL) + { + return (-1); + } + + n = LIBNET_STP_CONF_H + payload_s; /* size of memory block */ + h = 0; /* no 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_STP_CONF_H); + if (p == NULL) + { + return (-1); + } + + /* until we get some data marshalling in place we can't use this */ + /* + stp_hdr.stp_id = htons(id); + stp_hdr.stp_version = version; + stp_hdr.stp_bpdu_type = bpdu_type; + stp_hdr.stp_flags = flags; + memcpy(&stp_hdr.stp_rootid, root_id, 8); + stp_hdr.stp_rootpc = htonl(root_pc); + memcpy(&stp_hdr.stp_bridgeid, bridge_id, 8); + stp_hdr.stp_portid = htons(port_id); + stp_hdr.stp_mage = htons(message_age); + stp_hdr.stp_maxage = htons(max_age); + stp_hdr.stp_hellot = htons(hello_time); + stp_hdr.stp_fdelay = htons(f_delay); + */ + + value_s = htons(id); + memcpy(stp_hdr, &value_s, 2); + stp_hdr[2] = version; + stp_hdr[3] = bpdu_type; + stp_hdr[4] = flags; + memcpy(&stp_hdr[5], root_id, 8); + value_l = htonl(root_pc); + memcpy(&stp_hdr[13], &value_l, 4); + memcpy(&stp_hdr[17], bridge_id, 8); + value_s = htons(port_id); + memcpy(&stp_hdr[25], &value_s, 2); +#if (LIBNET_BIG_ENDIAN == 1) + value_s = htons(message_age); +#else + value_s = message_age; +#endif + memcpy(&stp_hdr[27], &value_s, 2); +#if (LIBNET_BIG_ENDIAN == 1) + value_s = htons(max_age); +#else + value_s = max_age; +#endif + memcpy(&stp_hdr[29], &value_s, 2); +#if (LIBNET_BIG_ENDIAN == 1) + value_s = htons(hello_time); +#else + value_s = hello_time; +#endif + memcpy(&stp_hdr[31], &value_s, 2); +#if (LIBNET_BIG_ENDIAN == 1) + value_s = htons(f_delay); +#else + value_s = f_delay; +#endif + memcpy(&stp_hdr[33], &value_s, 2); + + + /* until we get some data marshalling in place we can't use this */ + /*n = libnet_pblock_append(l, p, (u_int8_t *)&stp_hdr, LIBNET_STP_CONF_H); */ + n = libnet_pblock_append(l, p, stp_hdr, LIBNET_STP_CONF_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; + } + } + + return (ptag ? ptag : libnet_pblock_update(l, p, h, + LIBNET_PBLOCK_STP_CONF_H)); +bad: + libnet_pblock_delete(l, p); + return (-1); +} + + +libnet_ptag_t +libnet_build_stp_tcn(u_int16_t id, u_int8_t version, u_int8_t bpdu_type, + 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_stp_tcn_hdr stp_hdr; + + if (l == NULL) + { + return (-1); + } + + n = LIBNET_STP_TCN_H + payload_s; /* size of memory block */ + h = 0; /* no 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_STP_TCN_H); + if (p == NULL) + { + return (-1); + } + + memset(&stp_hdr, 0, sizeof(stp_hdr)); + stp_hdr.stp_id = htons(id); + stp_hdr.stp_version = version; + stp_hdr.stp_bpdu_type = bpdu_type; + + n = libnet_pblock_append(l, p, (u_int8_t *)&stp_hdr, LIBNET_STP_TCN_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; + } + } + + return (ptag ? ptag : libnet_pblock_update(l, p, h, + LIBNET_PBLOCK_STP_TCN_H)); +bad: + libnet_pblock_delete(l, p); + return (-1); +} + +/* EOF */ |