diff options
Diffstat (limited to 'libnet/src/libnet_build_ntp.c')
| -rw-r--r-- | libnet/src/libnet_build_ntp.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/libnet/src/libnet_build_ntp.c b/libnet/src/libnet_build_ntp.c new file mode 100644 index 0000000..dd3d64f --- /dev/null +++ b/libnet/src/libnet_build_ntp.c @@ -0,0 +1,121 @@ +/* + * $Id: libnet_build_ntp.c,v 1.9 2004/03/01 20:26:12 mike Exp $ + * + * libnet + * libnet_build_ntp.c - NTP 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_ntp(u_int8_t leap_indicator, u_int8_t version, u_int8_t mode, +u_int8_t stratum, u_int8_t poll, u_int8_t precision, u_int16_t delay_int, +u_int16_t delay_frac, u_int16_t dispersion_int, u_int16_t dispersion_frac, +u_int32_t reference_id, u_int32_t ref_ts_int, u_int32_t ref_ts_frac, +u_int32_t orig_ts_int, u_int32_t orig_ts_frac, u_int32_t rec_ts_int, +u_int32_t rec_ts_frac, u_int32_t xmt_ts_int, u_int32_t xmt_ts_frac, +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_ntp_hdr ntp_hdr; + + if (l == NULL) + { + return (-1); + } + + n = LIBNET_NTP_H + payload_s; + h = 0; + + /* + * Find the existing protocol block if a ptag is specified, or create + * a new one. + */ + p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_NTP_H); + if (p == NULL) + { + return (-1); + } + + memset(&ntp_hdr, 0, sizeof(ntp_hdr)); + ntp_hdr.ntp_li_vn_mode = LIBNET_NTP_DO_LI_VN_MODE( + leap_indicator, version, mode); + ntp_hdr.ntp_stratum = stratum; + ntp_hdr.ntp_poll = poll; + ntp_hdr.ntp_precision = precision; + ntp_hdr.ntp_delay.integer = htons(delay_int); + ntp_hdr.ntp_delay.fraction = htons(delay_frac); + ntp_hdr.ntp_dispersion.integer = htons(dispersion_int); + ntp_hdr.ntp_dispersion.fraction = htons(dispersion_frac); + ntp_hdr.ntp_reference_id = htonl(reference_id); + ntp_hdr.ntp_ref_ts.integer = htonl(ref_ts_int); + ntp_hdr.ntp_ref_ts.fraction = htonl(ref_ts_frac); + ntp_hdr.ntp_orig_ts.integer = htonl(orig_ts_int); + ntp_hdr.ntp_orig_ts.fraction = htonl(orig_ts_frac); + ntp_hdr.ntp_rec_ts.integer = htonl(orig_ts_int); + ntp_hdr.ntp_rec_ts.fraction = htonl(orig_ts_frac); + ntp_hdr.ntp_xmt_ts.integer = htonl(xmt_ts_int); + ntp_hdr.ntp_xmt_ts.fraction = htonl(xmt_ts_frac); + + n = libnet_pblock_append(l, p, (u_int8_t *)&ntp_hdr, LIBNET_NTP_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_NTP_H)); +bad: + libnet_pblock_delete(l, p); + return (-1); +} + +/* EOF */ |