mirror of
https://github.com/DigitalDevices/octonet.git
synced 2023-10-10 13:36:52 +02:00
277 lines
7.1 KiB
C
277 lines
7.1 KiB
C
/*
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(C) 2012-13 Digital Devices GmbH.
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This file is part of the octoserve SAT>IP server.
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Octoserve 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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Octoserve 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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You should have received a copy of the GNU General Public License
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along with octoserve. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "octoserve.h"
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extern uint32_t debug;
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static uint16_t cs16(uint8_t *p, uint32_t len)
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{
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uint32_t cs;
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cs = (p[0] << 8) | p[1];
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p += 4;
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len -= 4;
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for (; len > 0; len -= 2, p += 2)
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cs += (p[0] << 8) | p[1];
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if (len)
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cs += p[0];
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while (cs >> 16)
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cs = (cs & 0xffff) + (cs >> 16);
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return ~cs;
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}
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void proc_igmp(struct octoserve *os, uint8_t *b, int l, uint8_t *macheader)
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{
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int hl = (b[0] & 0xf) * 4, pl, rl, i, j, ns, al;
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uint8_t cmd, *r, *s, type, *p;
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uint16_t n;
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char sd[64], mc[256], *mac = 0;
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uint16_t cs;
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if (macheader)
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mac = macheader + 6;
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if (hl + 1 > l)
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return;
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//22:45:32.073241 IP edge > 239.7.1.1: igmp v2 report 239.7.1.1
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//0x0000: 0100 5e07 0101 089e 01b2 03c9 0800 46c0
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//0x0010: 0020 0000 4000 0102 3159 c0a8 020e ef07
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//0x0020: 0101 9404 0000 1600 f9f6 ef07 0101
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dump(b, l);
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sprintf(sd, "%03d.%03d.%03d.%03d -> %03d.%03d.%03d.%03d",
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b[12], b[13], b[14], b[15],
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b[16], b[17], b[18], b[19]);
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p = b + hl;
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pl = l - hl;
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if (pl < 4)
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return;
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if (cs16(p, pl) != ((p[2] << 8) | p[3])) {
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dbgprintf(DEBUG_IGMP, "IGMP CS error\n");
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#if 0
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if (debug & DEBUG_IGMP)
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dump(b, l);
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#endif
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return;
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}
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cmd = b[hl];
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switch (cmd) {
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case 0x11:
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{
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uint32_t a1, a2;
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uint8_t *s;
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if (pl < 12)
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return;
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dbgprintf(DEBUG_IGMP, "IGMP: query by %s\n", sd);
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s = (uint8_t *) &(((struct sockaddr_in *) &os->ssdp.sadr)->sin_addr);
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a1 = (b[12] << 24) | (b[13] << 16) | (b[14] << 8) | b[15];
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a2 = (s[0] << 24) | (s[1] << 16) | (s[2] << 8) | s[3];
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dbgprintf(DEBUG_IGMP, "%08x < %08x ? %s\n", a1, a2,
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(a1 < a2) ? "yes" : "no");
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if (a1 < a2) {
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/* somebody else with lower IP is already sending queries */
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os->igmp_mode = 3;
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mtime(&os->igmp_time);
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os->igmp_tag++;
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os->igmp_timeout = b[hl + 1] / 10 + 1;
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dbgprintf(DEBUG_IGMP, "IGMP slave, tag = %u, timeout = %u\n",
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os->igmp_tag, os->igmp_timeout);
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} else
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dbgprintf(DEBUG_IGMP, "IGMP master, tag = %u\n", os->igmp_tag);
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break;
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}
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case 0x12:
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if (pl < 8)
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return;
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dbgprintf(DEBUG_IGMP, "IGMPV1: %s : %d.%d.%d.%d\n", sd,
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b[hl + 4], b[hl + 5], b[hl + 6], b[hl + 7]);
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mc_join(os, b + 12, mac, &b[hl + 4]);
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break;
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case 0x16:
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if (pl < 8)
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return;
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dbgprintf(DEBUG_IGMP, "IGMPV2: %s : %d.%d.%d.%d\n", sd,
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b[hl + 4], b[hl + 5], b[hl + 6], b[hl + 7]);
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mc_join(os, b + 12, mac, &b[hl + 4]);
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break;
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case 0x17:
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if (pl < 8)
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return;
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dbgprintf(DEBUG_IGMP, "IGMPL: %s : %d.%d.%d.%d\n", sd,
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b[hl + 4], b[hl + 5], b[hl + 6], b[hl + 7]);
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mc_leave(os, b + 12, &b[hl + 4]);
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break;
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case 0x22:
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if (pl < 8)
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return;
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pl -= 8;
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//dump(b + hl, l - hl);
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n = (b[hl + 6] << 8) | b[hl + 7];
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dbgprintf(DEBUG_IGMP, "IGMPV3: %s, %d records:\n", sd, n);
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for (i = 0, r = &b[hl + 8]; i < n; i++, r += rl, pl -= rl) {
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if (pl < 4)
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return;
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ns = (r[2] << 8) | r[3];
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al = r[1] * 4;
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rl = 8 + ns * 4 + al;
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if (pl < rl)
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return;
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type = r[0];
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dbgprintf(DEBUG_IGMP, "type %d, %d sources, %d aux:\n", type, ns, al);
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if (ns) {
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dbgprintf(DEBUG_IGMP, "cannot handle sources\n");
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continue;
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}
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if (type == 2) {
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dbgprintf(DEBUG_IGMP, "IGMPV3: %s subscribed to %d\n", sd, ns);
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mc_join(os, b + 12, mac, &r[4]);
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}
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if (type == 4) {
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dbgprintf(DEBUG_IGMP, "IGMPV3: %s, change to Exclude %d (Join)\n",
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sd, ns);
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mc_join(os, b + 12, mac, &r[4]);
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}
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if (type == 3) {
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dbgprintf(DEBUG_IGMP, "IGMPV3: %s, change to Include %d (Leave)\n",
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sd, ns);
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mc_leave(os, b + 12, &r[4]);
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}
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//printf("MC: %d.%d.%d.%d\n", r[4], r[5], r[6], r[7]);
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for (j = 0, s = &r[8]; j < ns; j++, s += 4) {
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dbgprintf(DEBUG_IGMP, "%d.%d.%d.%d\n", s[0], s[1], s[2], s[3]);
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}
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}
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break;
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}
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//dump(b + hl, l - hl);
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}
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static void calc_cs(uint8_t *m, uint32_t len)
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{
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uint32_t cs = 0, i;
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for (i = 0; i < len - 1; i += 2)
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cs += (m[i] << 8) | m[i + 1];
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if (i < len)
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cs += m[i] << 8;
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cs = (cs >> 16) + (cs & 0xffff);
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cs = (cs >> 16) + (cs & 0xffff);
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cs ^= 0xffff;
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m[2] = cs >> 8;
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m[3] = cs & 0xff;
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}
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/*22:42:32.973024 IP octonet > all-systems.mcast.net: igmp query v3
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0x0000: 0100 5e00 0001 5484 7b00 141a 0800 4600
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0x0010: 0024 6682 4000 0102 db58 c0a8 024f e000
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0x0020: 0001 9404 0000 1164 ec1e 0000 0000 027d
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0x0030: 0000 0000 0000 0000 0000 0000
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22:41:49.696510 IP fuckoff > all-systems.mcast.net: igmp query v2
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0x0000: 0100 5e00 0001 30b5 c2aa 24b6 0800 46c0
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0x0010: 0020 0000 4000 0102 40a6 c0a8 02c8 e000
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0x0020: 0001 9404 0000 1164 ee9b 0000 0000 0000
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0x0030: 0000 0000 0000 0000 0000 0000
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*/
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void send_igmp_query(struct octoserve *os, uint8_t *group, uint8_t timeout)
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{
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uint8_t msg[] = { 0x11, 0x64, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x02, 0x7d, 0x00, 0x00
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};
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struct sockaddr_in insadr;
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uint8_t zero = 0, ra[4] = { 0x94, 0x04, 0x00, 0x00 };
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memset(&insadr, 0, sizeof(insadr));
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insadr.sin_family = AF_INET;
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insadr.sin_port = IPPROTO_IGMP;
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//insadr.sin_addr.s_addr = inet_addr("224.0.0.22");
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insadr.sin_addr.s_addr = inet_addr("224.0.0.1");
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if (group) {
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msg[4] = group[0];
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msg[5] = group[1];
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msg[6] = group[2];
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msg[7] = group[3];
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memcpy(&insadr.sin_addr.s_addr, group, 4);
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}
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if (timeout)
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msg[1] = timeout;
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calc_cs(msg, sizeof(msg));
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setsockopt(os->igmp_sock, IPPROTO_IP, IP_OPTIONS, ra, sizeof(ra));
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sendto(os->igmp_sock, msg, sizeof(msg), 0, (struct sockaddr *) &insadr, sizeof(insadr));
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dbgprintf(DEBUG_IGMP, "Queried group %03u.%03u.%03u.%03u\n",
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msg[4], msg[5], msg[6], msg[7]);
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}
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void check_igmp(struct octoserve *os)
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{
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time_t tdiff, t;
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tdiff = mtime(&t) - os->igmp_time;
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switch (os->igmp_mode) {
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case 0:
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if (tdiff > 124) {
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os->igmp_timeout = 10;
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dbgprintf(DEBUG_IGMP,
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"%u: IGMP master query, tag = %u, timeout = %u\n",
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t, os->igmp_tag, os->igmp_timeout);
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os->igmp_tag++;
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send_igmp_query(os, 0, 0);
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os->igmp_time = t;
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os->igmp_mode = 1;
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#if 0
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if (os->igmp_robust) {
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os->igmp_robust--;
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os->igmp_time -= 94;
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}
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#endif
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}
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break;
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case 1:
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if (tdiff > os->igmp_timeout) {
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dbgprintf(DEBUG_IGMP, "%u: IGMP timeout, tag = %u, tdiff = %u\n",
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t, os->igmp_tag, tdiff);
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os->igmp_mode = 0;
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}
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break;
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case 2:
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/* check if query master timed out */
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if (tdiff < 255)
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return;
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/* yes, so we will have to query from now on */
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os->igmp_mode = 0;
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os->igmp_time = t - 94;
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os->igmp_robust = 1;
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break;
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case 3:
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if (tdiff > os->igmp_timeout) {
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dbgprintf(DEBUG_IGMP, "%u: IGMP timeout, tag = %u\n", t, os->igmp_tag);
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os->igmp_mode = 2;
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}
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break;
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}
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}
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