$Id$
1. Some problems seen by one person who tried to build Ethereal on IRIX;
-your mileage may vary.
+your mileage may vary. Some comments hae been added.
To: ethereal-dev@zing.org
Subject: Re: [ethereal-dev] Ethereal on SGI
BETTER SOLUTION: Modify configure to support RPATH for more platforms
than Solaris.
+[NOTE: configure is generated from configure.in and acinclude.m4, and
+all the linking stuff is done by libtool. We don't recommend the
+LD_LIBRARY_PATH hack - perhaps we did so in the past, but we don't do so
+now.]
+
==========
PROBLEM #2
==========
Randall
+[NOTE: we don't use the __P macro ourselves; some of the SNMP libraries
+might, but that's a bug in the libraries if they require you to define
+__P in order to use them.]
+
===============================================================================
Problem #1:
2. Patches to libpcap that may be necessary
-On IRIX, the libpcap library uses, in "pcap_open_live()", the snapshot
-length passed in, without reducing it to be less than or equal to the
-MTU of the interface. If the snapshot length is larger than the
-interface MTU, IRIX will return an error; this means that, for example,
-the Ethereal default snapshot length of 65535, chosen so that all of the
-packet is captured, will not work.
-
-Here is a patch to libpcap 0.4 source that should fix that problem. If
-it doesn't fix the problem, or if it reduces the snapshot length below
-the MTU (so that a snapshot length of 65535 doesn't capture all the data
-in the packets), please report this to ethereal-dev@ethereal.com, so
-that we know that it didn't work - we'll probably send you debugging
-patches in the hopes of being able to make it work.
-
-diff -c ../libpcap-0.4/pcap-snoop.c ./pcap-snoop.c
-*** ../libpcap-0.4/pcap-snoop.c Tue Apr 8 21:07:01 1997
---- ./pcap-snoop.c Tue Jan 18 00:16:18 2000
-***************
-*** 126,132 ****
---- 126,135 ----
- struct sockaddr_raw sr;
- struct snoopfilter sf;
- u_int v;
-+ int ll_hdrlen;
-+ int snooplen;
- pcap_t *p;
-+ struct ifreq ifr;
-
- p = (pcap_t *)malloc(sizeof(*p));
- if (p == NULL) {
-***************
-*** 154,169 ****
- }
- v = 64 * 1024;
- (void)setsockopt(fd, SOL_SOCKET, SO_RCVBUF, (char *)&v, sizeof(v));
-- if (ioctl(fd, SIOCSNOOPLEN, &snaplen) < 0) {
-- sprintf(ebuf, "SIOCSNOOPLEN: %s", pcap_strerror(errno));
-- goto bad;
-- }
-- p->snapshot = snaplen;
-- v = 1;
-- if (ioctl(fd, SIOCSNOOPING, &v) < 0) {
-- sprintf(ebuf, "SIOCSNOOPING: %s", pcap_strerror(errno));
-- goto bad;
-- }
- /*
- * XXX hack - map device name to link layer type
- */
---- 157,162 ----
-***************
-*** 179,195 ****
---- 172,242 ----
- strncmp("qaa", device, 3) == 0) {
- p->linktype = DLT_EN10MB;
- p->offset = RAW_HDRPAD(sizeof(struct ether_header));
-+ ll_hdrlen = sizeof(struct ether_header);
- } else if (strncmp("ipg", device, 3) == 0 ||
- strncmp("rns", device, 3) == 0 || /* O2/200/2000 FDDI */
- strncmp("xpi", device, 3) == 0) {
- p->linktype = DLT_FDDI;
- p->offset = 3; /* XXX yeah? */
-+ ll_hdrlen = 13;
- } else if (strncmp("ppp", device, 3) == 0) {
- p->linktype = DLT_RAW;
-+ ll_hdrlen = 0; /* DLT_RAW meaning "no PPP header, just the IP packet"? */
- } else if (strncmp("lo", device, 2) == 0) {
- p->linktype = DLT_NULL;
-+ ll_hdrlen = 4; /* is this just like BSD's loopback device? */
- } else {
- sprintf(ebuf, "snoop: unknown physical layer type");
-+ goto bad;
-+ }
-+ #ifdef SIOCGIFMTU
-+ /*
-+ * XXX - IRIX appears to give you an error if you try to set the
-+ * capture length to be greater than the MTU, so let's try to get
-+ * the MTU first and, if that succeeds, trim the snap length
-+ * to be no greater than the MTU.
-+ */
-+ (void)strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
-+ if (ioctl(fd, SIOCGIFMTU, (char *)&ifr) < 0) {
-+ sprintf(ebuf, "SIOCGIFMTU: %s", pcap_strerror(errno));
-+ goto bad;
-+ }
-+ /*
-+ * OK, we got it.
-+ * XXX - some versions of IRIX 6.5 define "ifr_mtu" and have an
-+ * "ifru_metric" member of the "ifr_ifru" union in an "ifreq"
-+ * structure, others don't.
-+ *
-+ * I've no idea what's going on, so, if "ifr_mtu" isn't defined,
-+ * we define it as "ifr_metric", as using that field appears to
-+ * work on the versions that lack "ifr_mtu" (and, on those that
-+ * don't lack it, "ifru_metric" and "ifru_mtu" are both "int"
-+ * members of the "ifr_ifru" union, which suggests that they
-+ * may be interchangeable in this case).
-+ */
-+ #ifndef ifr_mtu
-+ #define ifr_mtu ifr_metric
-+ #endif
-+ if (snaplen > ifr.ifr_mtu)
-+ snaplen = ifr.ifr_mtu;
-+ #endif
-+
-+ /*
-+ * The argument to SIOCSNOOPLEN is the number of link-layer
-+ * payload bytes to capture - it doesn't count link-layer
-+ * header bytes.
-+ */
-+ snooplen = snaplen - ll_hdrlen;
-+ if (snooplen < 0)
-+ snooplen = 0;
-+ if (ioctl(fd, SIOCSNOOPLEN, &snooplen) < 0) {
-+ sprintf(ebuf, "SIOCSNOOPLEN: %s", pcap_strerror(errno));
-+ goto bad;
-+ }
-+ p->snapshot = snaplen;
-+ v = 1;
-+ if (ioctl(fd, SIOCSNOOPING, &v) < 0) {
-+ sprintf(ebuf, "SIOCSNOOPING: %s", pcap_strerror(errno));
- goto bad;
- }
-
+On IRIX, older versions of the libpcap library use, in
+"pcap_open_live()", the snapshot length passed in, without reducing it
+to be less than or equal to the MTU of the interface. If the snapshot
+length is larger than the interface MTU, IRIX will return an error; this
+means that, for example, the Ethereal default snapshot length of 65535,
+chosen so that all of the packet is captured, will not work.
+Current versions of libpcap, from tcpdump.org, do not do so.
git.samba.org / obnox / wireshark / wip.git / blobdiff