77 lines
1.7 KiB
C
77 lines
1.7 KiB
C
#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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/* this program wants to be called with 'strace -s1024 -x' so you see the data
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* betewen DAHDI and it */
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const uint8_t aa_frame[] = { 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
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0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa };
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const uint8_t ff_frame[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
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//const uint8_t sabme_frame[] = { 0xFA, 0x7D, 0x7F };
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const uint8_t sabme_frame[] = { 0x7e, 0x7e, 0x7e, 0x5f, 0x5f, 0x3e, 0xce, 0x49, 0xef, 0xcf, 0xcf, 0xcf, 0xcf, 0xcf };
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static int fd;
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static uint8_t dummy_buf[8192];
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static void dummy_read(int fd, unsigned int len)
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{
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int rc;
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if (len > sizeof(dummy_buf))
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len = sizeof(dummy_buf);
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rc = read(fd, dummy_buf, len);
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}
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/* try to re-create the initialization routine as from a trace between Racal 6113 and RBS */
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static void init(void)
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{
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int i;
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uint8_t fiftyfive = 0x55;
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/* first play some 0xaa sequences */
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for (i = 1; i < 50; i++) {
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write(fd, aa_frame, sizeof(aa_frame));
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dummy_read(fd, sizeof(aa_frame));
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}
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/* 0xaa sequence with final 0x55 */
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write(fd, aa_frame, sizeof(aa_frame)-1);
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write(fd, &fiftyfive, 1);
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dummy_read(fd, sizeof(aa_frame));
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/* play some 0xff sequence */
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for (i = 0x92f; i < 0x960; i++) {
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write(fd, ff_frame, sizeof(aa_frame));
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dummy_read(fd, sizeof(aa_frame));
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}
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/* send a SABME frame */
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write(fd, sabme_frame, sizeof(sabme_frame));
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/* endless loop, read data. */
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while (1)
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dummy_read(fd, sizeof(sabme_frame));
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}
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int main(int argc, char **argv)
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{
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if (argc < 2)
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exit(2);
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fd = open(argv[1], O_RDWR);
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if (fd < 0) {
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perror("open");
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exit(1);
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}
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init();
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}
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