shmif_dumpbus.c revision 1.10
1 /* $NetBSD: shmif_dumpbus.c,v 1.10 2013/12/20 09:36:03 pooka Exp $ */ 2 3 /*- 4 * Copyright (c) 2010 Antti Kantee. All Rights Reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 16 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 18 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 /* 29 * Convert shmif bus traffic to a pcap file which can be then 30 * examined with tcpdump -r, wireshark, etc. 31 */ 32 33 #ifndef lint 34 __RCSID("$NetBSD: shmif_dumpbus.c,v 1.10 2013/12/20 09:36:03 pooka Exp $"); 35 #endif /* !lint */ 36 37 #include <sys/types.h> 38 #include <sys/mman.h> 39 #include <sys/stat.h> 40 41 #include <machine/bswap.h> 42 43 #include <assert.h> 44 #include <err.h> 45 #include <fcntl.h> 46 #include <inttypes.h> 47 #include <pcap.h> 48 #include <stdbool.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <unistd.h> 53 54 #include "shmifvar.h" 55 56 __dead static void 57 usage(void) 58 { 59 60 fprintf(stderr, "usage: %s [-h] [-p pcapfile] buspath\n",getprogname()); 61 exit(1); 62 } 63 64 #define BUFSIZE 64*1024 65 #define SWAPME(a) (doswap ? bswap32(a) : (a)) 66 #define SWAPME64(a) (doswap ? bswap64(a) : (a)) 67 int 68 main(int argc, char *argv[]) 69 { 70 struct stat sb; 71 void *busmem; 72 const char *pcapfile = NULL; 73 uint32_t curbus, buslast; 74 struct shmif_mem *bmem; 75 int fd, i, ch; 76 int bonus; 77 char *buf; 78 bool hflag = false, doswap = false; 79 pcap_dumper_t *pdump; 80 FILE *dumploc = stdout; 81 82 setprogname(argv[0]); 83 while ((ch = getopt(argc, argv, "hp:")) != -1) { 84 switch (ch) { 85 case 'h': 86 hflag = true; 87 break; 88 case 'p': 89 pcapfile = optarg; 90 break; 91 default: 92 usage(); 93 } 94 } 95 96 argc -= optind; 97 argv += optind; 98 99 if (argc != 1) 100 usage(); 101 102 buf = malloc(BUFSIZE); 103 if (buf == NULL) 104 err(1, "malloc"); 105 106 fd = open(argv[0], O_RDONLY); 107 if (fd == -1) 108 err(1, "open bus"); 109 110 if (fstat(fd, &sb) == -1) 111 err(1, "stat"); 112 113 busmem = mmap(NULL, sb.st_size, PROT_READ, MAP_FILE|MAP_SHARED, fd, 0); 114 if (busmem == MAP_FAILED) 115 err(1, "mmap"); 116 bmem = busmem; 117 118 if (bmem->shm_magic != SHMIF_MAGIC) { 119 if (bmem->shm_magic != bswap32(SHMIF_MAGIC)) 120 errx(1, "%s not a shmif bus", argv[0]); 121 doswap = 1; 122 } 123 if (SWAPME(bmem->shm_version) != SHMIF_VERSION) 124 errx(1, "bus vesrsion %d, program %d", 125 SWAPME(bmem->shm_version), SHMIF_VERSION); 126 127 if (pcapfile && strcmp(pcapfile, "-") == 0) 128 dumploc = stderr; 129 130 fprintf(dumploc, "bus version %d, lock: %d, generation: %" PRIu64 131 ", firstoff: 0x%04x, lastoff: 0x%04x\n", 132 SWAPME(bmem->shm_version), SWAPME(bmem->shm_lock), 133 SWAPME64(bmem->shm_gen), 134 SWAPME(bmem->shm_first), SWAPME(bmem->shm_last)); 135 136 if (hflag) 137 exit(0); 138 139 if (pcapfile) { 140 pcap_t *pcap = pcap_open_dead(DLT_EN10MB, 1518); 141 pdump = pcap_dump_open(pcap, pcapfile); 142 if (pdump == NULL) 143 err(1, "cannot open pcap dump file"); 144 } else { 145 /* XXXgcc */ 146 pdump = NULL; 147 } 148 149 curbus = SWAPME(bmem->shm_first); 150 buslast = SWAPME(bmem->shm_last); 151 if (curbus == BUSMEM_DATASIZE) 152 curbus = 0; 153 154 bonus = 0; 155 if (buslast < curbus) 156 bonus = 1; 157 158 i = 0; 159 while (curbus <= buslast || bonus) { 160 struct pcap_pkthdr packhdr; 161 struct shmif_pkthdr sp; 162 uint32_t oldoff; 163 uint32_t curlen; 164 bool wrap; 165 166 assert(curbus < sb.st_size); 167 168 wrap = false; 169 oldoff = curbus; 170 curbus = shmif_busread(bmem, &sp, oldoff, sizeof(sp), &wrap); 171 if (wrap) 172 bonus = 0; 173 174 assert(curbus < sb.st_size); 175 curlen = SWAPME(sp.sp_len); 176 177 if (curlen == 0) { 178 continue; 179 } 180 181 fprintf(dumploc, "packet %d, offset 0x%04x, length 0x%04x, " 182 "ts %d/%06d\n", i++, curbus, 183 curlen, SWAPME(sp.sp_sec), SWAPME(sp.sp_usec)); 184 185 if (!pcapfile) { 186 curbus = shmif_busread(bmem, 187 buf, curbus, curlen, &wrap); 188 if (wrap) 189 bonus = 0; 190 continue; 191 } 192 193 memset(&packhdr, 0, sizeof(packhdr)); 194 packhdr.caplen = packhdr.len = curlen; 195 packhdr.ts.tv_sec = SWAPME(sp.sp_sec); 196 packhdr.ts.tv_usec = SWAPME(sp.sp_usec); 197 assert(curlen <= BUFSIZE); 198 199 curbus = shmif_busread(bmem, buf, curbus, curlen, &wrap); 200 pcap_dump((u_char *)pdump, &packhdr, (u_char *)buf); 201 if (wrap) 202 bonus = 0; 203 } 204 205 if (pcapfile) 206 pcap_dump_close(pdump); 207 208 return 0; 209 } 210
Indexes created Tue Sep 30 20:09:53 GMT 2025