Module Name: src
Committed By: pooka
Date: Wed Aug 11 12:41:09 UTC 2010
Added Files:
src/sys/rump/net/lib/libshmif: dumpbus.c
Log Message:
Add a little utility to convert shmif bus traffic to a pcap file
which can be then examined with tcpdump -r, wireshark, etc.
To generate a diff of this commit:
cvs rdiff -u -r0 -r1.1 src/sys/rump/net/lib/libshmif/dumpbus.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Added files:
Index: src/sys/rump/net/lib/libshmif/dumpbus.c
diff -u /dev/null src/sys/rump/net/lib/libshmif/dumpbus.c:1.1
--- /dev/null Wed Aug 11 12:41:09 2010
+++ src/sys/rump/net/lib/libshmif/dumpbus.c Wed Aug 11 12:41:09 2010
@@ -0,0 +1,133 @@
+/* $NetBSD: dumpbus.c,v 1.1 2010/08/11 12:41:09 pooka Exp $ */
+
+/*
+ * Little utility to convert shmif bus traffic to a pcap file
+ * which can be then examined with tcpdump -r, wireshark, etc.
+ */
+
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+
+#include <err.h>
+#include <fcntl.h>
+#include <pcap.h>
+#include <stdio.h>
+#include <unistd.h>
+
+/* XXX: sync with driver */
+struct bushdr {
+ uint32_t lock;
+ uint32_t gen;
+ uint32_t last;
+ uint32_t version;
+};
+
+static void
+usage(void)
+{
+
+ fprintf(stderr, "usage: a.out [-p pcapfile] buspath\n");
+ exit(1);
+}
+
+int
+main(int argc, char *argv[])
+{
+ struct stat sb;
+ void *busmem;
+ const char *pcapfile = NULL;
+ uint8_t *curbus, *buslast;
+ struct bushdr *bhdr;
+ int fd, pfd, i, ch;
+
+ while ((ch = getopt(argc, argv, "p:")) != -1) {
+ switch (ch) {
+ case 'p':
+ pcapfile = optarg;
+ break;
+ default:
+ usage();
+ }
+ }
+
+ argc -= optind;
+ argv += optind;
+
+ if (argc != 1)
+ usage();
+
+ fd = open(argv[0], O_RDONLY);
+ if (fd == -1)
+ err(1, "open bus");
+
+ if (fstat(fd, &sb) == -1)
+ err(1, "stat");
+
+ busmem = mmap(NULL, sb.st_size, PROT_READ, MAP_FILE, fd, 0);
+ if (busmem == MAP_FAILED)
+ err(1, "mmap");
+
+ bhdr = busmem;
+ if (bhdr->version != 1)
+ errx(1, "cannot handle bus version %d", bhdr->version);
+ printf("bus version %d, lock: %d, generation: %d, lastoff: 0x%x\n",
+ bhdr->version, bhdr->lock, bhdr->gen, bhdr->last);
+
+ if (bhdr->gen != 0) {
+ printf("this dumper can manage only generation 0, sorry\n");
+ exit(0);
+ }
+
+ if (pcapfile) {
+ struct pcap_file_header phdr;
+
+ pfd = open(pcapfile, O_RDWR | O_CREAT, 0777);
+ if (pfd == -1)
+ err(1, "create pcap dump");
+
+ memset(&phdr, 0, sizeof(phdr));
+ phdr.magic = 0xa1b2c3d4; /* tcpdump magic */
+ phdr.version_major = PCAP_VERSION_MAJOR;
+ phdr.version_minor = PCAP_VERSION_MINOR;
+ phdr.snaplen = 1518;
+ phdr.linktype = DLT_EN10MB;
+
+ if (write(pfd, &phdr, sizeof(phdr)) != sizeof(phdr))
+ err(1, "phdr write");
+ }
+
+ curbus = busmem;
+ buslast = curbus + bhdr->last;
+ curbus += sizeof(*bhdr);
+
+ i = 0;
+ while (curbus <= buslast) {
+ uint32_t pktlen;
+ struct pcap_pkthdr packhdr;
+
+ pktlen = *(uint32_t *)curbus;
+ curbus += sizeof(pktlen);
+
+ /* quirk */
+ if (pktlen == 0)
+ continue;
+
+ printf("packet %d, offset 0x%x, length 0x%x\n",
+ i++, curbus - (uint8_t *)(bhdr + 1), pktlen);
+
+ if (!pcapfile || pktlen == 0) {
+ curbus += pktlen;
+ continue;
+ }
+
+ memset(&packhdr, 0, sizeof(packhdr));
+ packhdr.caplen = packhdr.len = pktlen;
+
+ if (write(pfd, &packhdr, sizeof(packhdr)) != sizeof(packhdr))
+ err(1, "error writing packethdr");
+ if (write(pfd, curbus, pktlen) != pktlen)
+ err(1, "write packet");
+ curbus += pktlen;
+ }
+}
