forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
Have the version parameter be just the version number; other code expects it to be that. Have additional parameters for the "compiled with" and "running with" information. Add a extcap_version_print() routine to show the version message, printing {exename} version {version} and then printing Compiled with {compiled_with} if "compiled with" information is supplied and printing Running with {running_with} if "running with" information is supplied. This fixes some messages, as well as fixing the display of extcap modules in the About dialog. Change-Id: I3d298d30e83bd363abd599d75adfc780a90f34fd Reviewed-on: https://code.wireshark.org/review/37877 Petri-Dish: Guy Harris <gharris@sonic.net> Tested-by: Petri Dish Buildbot Reviewed-by: Guy Harris <gharris@sonic.net>
587 lines
13 KiB
C
587 lines
13 KiB
C
/* dpauxmon.c
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* dpauxmon is an extcap tool used to monitor DisplayPort AUX channel traffic
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* coming in from the kernel via generic netlink
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* Copyright 2018, Dirk Eibach, Guntermann & Drunck GmbH <dirk.eibach@gdsys.cc>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include "extcap-base.h"
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#include <wsutil/strtoi.h>
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#include <wsutil/filesystem.h>
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#include <wsutil/netlink.h>
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#include <wsutil/privileges.h>
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#include <writecap/pcapio.h>
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#include <netlink/netlink.h>
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#include <netlink/genl/genl.h>
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#include <netlink/genl/ctrl.h>
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#include <netlink/genl/mngt.h>
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#include <signal.h>
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#include <errno.h>
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#include <linux/genetlink.h>
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#include "dpauxmon_user.h"
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#define PCAP_SNAPLEN 128
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#define DPAUXMON_EXTCAP_INTERFACE "dpauxmon"
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#define DPAUXMON_VERSION_MAJOR "0"
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#define DPAUXMON_VERSION_MINOR "1"
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#define DPAUXMON_VERSION_RELEASE "0"
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static gboolean run_loop = TRUE;
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FILE* pcap_fp = NULL;
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enum {
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EXTCAP_BASE_OPTIONS_ENUM,
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OPT_HELP,
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OPT_VERSION,
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OPT_INTERFACE_ID,
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};
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static struct option longopts[] = {
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EXTCAP_BASE_OPTIONS,
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/* Generic application options */
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{ "help", no_argument, NULL, OPT_HELP},
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{ "version", no_argument, NULL, OPT_VERSION},
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/* Interfaces options */
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{ "interface_id", required_argument, NULL, OPT_INTERFACE_ID},
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{ 0, 0, 0, 0 }
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};
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static struct nla_policy dpauxmon_attr_policy[DPAUXMON_ATTR_MAX + 1] = {
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[DPAUXMON_ATTR_IFINDEX] = { .type = NLA_U32 },
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[DPAUXMON_ATTR_FROM_SOURCE] = { .type = NLA_FLAG },
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[DPAUXMON_ATTR_TIMESTAMP] = { .type = NLA_MSECS },
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};
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struct family_handler_args {
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const char *group;
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int id;
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};
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static int list_config(char *interface)
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{
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unsigned inc = 0;
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if (!interface) {
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g_warning("No interface specified.");
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return EXIT_FAILURE;
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}
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if (g_strcmp0(interface, DPAUXMON_EXTCAP_INTERFACE)) {
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g_warning("interface must be %s", DPAUXMON_EXTCAP_INTERFACE);
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return EXIT_FAILURE;
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}
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printf("arg {number=%u}{call=--interface_id}{display=Interface index}"
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"{type=unsigned}{range=1,65535}{default=%u}{tooltip=The dpauxmon interface index}\n",
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inc++, 0);
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extcap_config_debug(&inc);
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return EXIT_SUCCESS;
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}
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static void exit_from_loop(int signo _U_)
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{
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run_loop = FALSE;
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}
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static int setup_dumpfile(const char* fifo, FILE** fp)
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{
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guint64 bytes_written = 0;
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int err;
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if (!g_strcmp0(fifo, "-")) {
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*fp = stdout;
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return EXIT_SUCCESS;
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}
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*fp = fopen(fifo, "wb");
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if (!(*fp)) {
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g_warning("Error creating output file: %s", g_strerror(errno));
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return EXIT_FAILURE;
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}
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if (!libpcap_write_file_header(*fp, 275, PCAP_SNAPLEN, FALSE, &bytes_written, &err)) {
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g_warning("Can't write pcap file header");
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return EXIT_FAILURE;
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}
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return EXIT_SUCCESS;
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}
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static int dump_packet(FILE* fp, const char* buf, const guint32 buflen, guint64 ts_usecs)
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{
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guint64 bytes_written = 0;
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int err;
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int ret = EXIT_SUCCESS;
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if (!libpcap_write_packet(fp, ts_usecs / 1000000, ts_usecs % 1000000, buflen, buflen, buf, &bytes_written, &err)) {
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g_warning("Can't write packet");
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ret = EXIT_FAILURE;
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}
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fflush(fp);
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return ret;
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}
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static int error_handler(struct sockaddr_nl *nla _U_, struct nlmsgerr *err,
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void *arg)
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{
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int *ret = (int*)arg;
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*ret = err->error;
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return NL_STOP;
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}
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static int ack_handler(struct nl_msg *msg _U_, void *arg)
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{
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int *ret = (int*)arg;
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*ret = 0;
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return NL_STOP;
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}
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static int family_handler(struct nl_msg *msg, void *arg)
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{
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struct family_handler_args *grp = (struct family_handler_args *)arg;
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struct nlattr *tb[CTRL_ATTR_MAX + 1];
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struct genlmsghdr *gnlh = (struct genlmsghdr *)nlmsg_data(nlmsg_hdr(msg));
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struct nlattr *mcgrp;
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int rem_mcgrp;
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nla_parse(tb, CTRL_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
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genlmsg_attrlen(gnlh, 0), NULL);
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if (!tb[CTRL_ATTR_MCAST_GROUPS])
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return NL_SKIP;
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nla_for_each_nested(mcgrp, tb[CTRL_ATTR_MCAST_GROUPS], rem_mcgrp) {
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struct nlattr *tb_mcgrp[CTRL_ATTR_MCAST_GRP_MAX + 1];
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nla_parse(tb_mcgrp, CTRL_ATTR_MCAST_GRP_MAX,
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(struct nlattr *)nla_data(mcgrp), nla_len(mcgrp), NULL);
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if (!tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME] ||
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!tb_mcgrp[CTRL_ATTR_MCAST_GRP_ID])
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continue;
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if (strncmp((const char*)nla_data(tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME]),
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grp->group,
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nla_len(tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME])))
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continue;
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grp->id = nla_get_u32(tb_mcgrp[CTRL_ATTR_MCAST_GRP_ID]);
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break;
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}
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return NL_SKIP;
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}
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static int nl_get_multicast_id(struct nl_sock *sock, int family,
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const char *group)
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{
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struct nl_msg *msg;
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struct nl_cb *cb;
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int ret, ctrlid;
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struct family_handler_args grp = {
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.group = group,
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.id = -ENOENT,
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};
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msg = nlmsg_alloc();
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if (!msg)
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return -ENOMEM;
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cb = nl_cb_alloc(NL_CB_DEFAULT);
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if (!cb) {
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ret = -ENOMEM;
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goto out_fail_cb;
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}
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ctrlid = genl_ctrl_resolve(sock, "nlctrl");
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genlmsg_put(msg, 0, 0, ctrlid, 0, 0, CTRL_CMD_GETFAMILY, 0);
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ret = -ENOBUFS;
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NLA_PUT_U16(msg, CTRL_ATTR_FAMILY_ID, family);
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ret = nl_send_auto_complete(sock, msg);
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if (ret < 0)
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goto nla_put_failure;
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ret = 1;
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nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &ret);
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nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, ack_handler, &ret);
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nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, family_handler, &grp);
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while (ret > 0)
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nl_recvmsgs(sock, cb);
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if (ret == 0)
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ret = grp.id;
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nla_put_failure:
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nl_cb_put(cb);
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out_fail_cb:
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nlmsg_free(msg);
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return ret;
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}
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/*
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* netlink callback handlers
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*/
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static int nl_receive_timeout(struct nl_sock* sk, struct sockaddr_nl* nla, unsigned char** buf, struct ucred** creds)
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{
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struct pollfd fds = {nl_socket_get_fd(sk), POLLIN, 0};
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int poll_res = poll(&fds, 1, 500);
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if (poll_res < 0) {
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g_debug("poll() failed in nl_receive_timeout");
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g_usleep(500000);
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return -nl_syserr2nlerr(errno);
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}
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return poll_res ? nl_recv(sk, nla, buf, creds) : 0;
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}
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static int send_start(struct nl_sock *sock, int family, unsigned int interface_id)
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{
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struct nl_msg *msg;
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void *hdr;
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int err;
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int res = 0;
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msg = nlmsg_alloc();
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if (msg == NULL) {
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g_critical("Unable to allocate netlink message");
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return -ENOMEM;
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}
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hdr = genlmsg_put(msg, NL_AUTO_PID, NL_AUTO_SEQ, family, 0, 0,
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DPAUXMON_CMD_START, 1);
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if (hdr == NULL) {
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g_critical("Unable to write genl header");
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res = -ENOMEM;
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goto out_free;
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}
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if ((err = nla_put_u32(msg, DPAUXMON_ATTR_IFINDEX, interface_id)) < 0) {
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g_critical("Unable to add attribute: %s", nl_geterror(err));
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res = -EIO;
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goto out_free;
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}
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if ((err = nl_send_auto_complete(sock, msg)) < 0)
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g_debug("Starting monitor failed, already running?");
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out_free:
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nlmsg_free(msg);
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return res;
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}
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static void send_stop(struct nl_sock *sock, int family, unsigned int interface_id)
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{
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struct nl_msg *msg;
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void *hdr;
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int err;
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msg = nlmsg_alloc();
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if (msg == NULL) {
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g_critical("Unable to allocate netlink message");
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return;
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}
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hdr = genlmsg_put(msg, NL_AUTO_PID, NL_AUTO_SEQ, family, 0, 0,
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DPAUXMON_CMD_STOP, 1);
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if (hdr == NULL) {
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g_critical("Unable to write genl header");
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goto out_free;
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}
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if ((err = nla_put_u32(msg, DPAUXMON_ATTR_IFINDEX, interface_id)) < 0) {
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g_critical("Unable to add attribute: %s", nl_geterror(err));
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goto out_free;
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}
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if ((err = nl_send_auto_complete(sock, msg)) < 0) {
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g_critical("Unable to send message: %s", nl_geterror(err));
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goto out_free;
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}
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out_free:
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nlmsg_free(msg);
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}
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static int handle_data(struct nl_cache_ops *unused _U_, struct genl_cmd *cmd _U_,
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struct genl_info *info, void *arg _U_)
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{
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unsigned char *data;
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guint32 data_size;
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guint64 ts = 0;
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guint8 packet[21] = { 0x00 };
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if (!info->attrs[DPAUXMON_ATTR_DATA])
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return NL_SKIP;
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data = (unsigned char*)nla_data(info->attrs[DPAUXMON_ATTR_DATA]);
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data_size = nla_len(info->attrs[DPAUXMON_ATTR_DATA]);
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if (data_size > 19) {
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g_debug("Invalid packet size %u", data_size);
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return NL_SKIP;
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}
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if (info->attrs[DPAUXMON_ATTR_TIMESTAMP])
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ts = nla_get_msecs(info->attrs[DPAUXMON_ATTR_TIMESTAMP]);
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packet[1] = info->attrs[DPAUXMON_ATTR_FROM_SOURCE] ? 0x01 : 0x00;
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memcpy(&packet[2], data, data_size);
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if (dump_packet(pcap_fp, packet, data_size + 2, ts) == EXIT_FAILURE)
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run_loop = FALSE;
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return NL_OK;
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}
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static int parse_cb(struct nl_msg *msg, void *arg _U_)
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{
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return genl_handle_msg(msg, NULL);
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}
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static struct genl_cmd cmds[] = {
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#if 0
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{
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.c_id = DPAUXMON_CMD_START,
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.c_name = "dpauxmon start",
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.c_maxattr = DPAUXMON_ATTR_MAX,
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.c_attr_policy = dpauxmon_attr_policy,
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.c_msg_parser = &handle_start,
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},
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{
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.c_id = DPAUXMON_CMD_STOP,
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.c_name = "dpauxmon stop",
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.c_maxattr = DPAUXMON_ATTR_MAX,
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.c_attr_policy = dpauxmon_attr_policy,
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.c_msg_parser = &handle_stop,
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},
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#endif
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{
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.c_id = DPAUXMON_CMD_DATA,
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.c_name = "dpauxmon data",
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.c_maxattr = DPAUXMON_ATTR_MAX,
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.c_attr_policy = dpauxmon_attr_policy,
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.c_msg_parser = &handle_data,
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},
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};
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#define ARRAY_SIZE(X) (sizeof(X) / sizeof((X)[0]))
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static struct genl_ops ops = {
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.o_name = "dpauxmon",
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.o_cmds = cmds,
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.o_ncmds = ARRAY_SIZE(cmds),
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};
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struct nl_sock *sock;
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static void run_listener(const char* fifo, unsigned int interface_id)
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{
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int err;
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int grp;
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struct sigaction int_handler = { .sa_handler = exit_from_loop };
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struct nl_cb *socket_cb;
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if (sigaction(SIGINT, &int_handler, 0)) {
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g_warning("Can't set signal handler");
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return;
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}
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if (setup_dumpfile(fifo, &pcap_fp) == EXIT_FAILURE) {
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if (pcap_fp)
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goto close_out;
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}
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if (!(sock = nl_socket_alloc())) {
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g_critical("Unable to allocate netlink socket");
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goto close_out;
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}
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if ((err = nl_connect(sock, NETLINK_GENERIC)) < 0) {
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g_critical("Unable to connect netlink socket: %s",
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nl_geterror(err));
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goto free_out;
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}
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if ((err = genl_register_family(&ops)) < 0) {
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g_critical("Unable to register Generic Netlink family");
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goto err_out;
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}
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if ((err = genl_ops_resolve(sock, &ops)) < 0) {
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g_critical("Unable to resolve family name");
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goto err_out;
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}
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/* register notification handler callback */
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if ((err = nl_socket_modify_cb(sock, NL_CB_VALID, NL_CB_CUSTOM,
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parse_cb, NULL)) < 0) {
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g_critical("Unable to modify valid message callback");
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goto err_out;
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}
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grp = nl_get_multicast_id(sock, ops.o_id, "notify");
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nl_socket_add_membership(sock, grp);
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if (!(socket_cb = nl_socket_get_cb(sock))) {
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g_warning("Can't overwrite recv callback");
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} else {
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nl_cb_overwrite_recv(socket_cb, nl_receive_timeout);
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nl_cb_put(socket_cb);
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}
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err = send_start(sock, ops.o_id, interface_id);
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if (err)
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goto err_out;
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nl_socket_disable_seq_check(sock);
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g_debug("DisplayPort AUX monitor running on interface %u", interface_id);
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while(run_loop == TRUE) {
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if ((err = nl_recvmsgs_default(sock)) < 0)
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g_warning("Unable to receive message: %s", nl_geterror(err));
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}
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send_stop(sock, ops.o_id, interface_id);
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err_out:
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nl_close(sock);
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free_out:
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nl_socket_free(sock);
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close_out:
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fclose(pcap_fp);
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}
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int main(int argc, char *argv[])
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{
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char* init_progfile_dir_error;
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int option_idx = 0;
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int result;
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unsigned int interface_id = 0;
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int ret = EXIT_FAILURE;
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extcap_parameters* extcap_conf = g_new0(extcap_parameters, 1);
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char* help_header = NULL;
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/*
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* Get credential information for later use.
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*/
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init_process_policies();
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/*
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* Attempt to get the pathname of the directory containing the
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* executable file.
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*/
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init_progfile_dir_error = init_progfile_dir(argv[0]);
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if (init_progfile_dir_error != NULL) {
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g_warning("Can't get pathname of directory containing the captype program: %s.",
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init_progfile_dir_error);
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g_free(init_progfile_dir_error);
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}
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extcap_base_set_util_info(extcap_conf, argv[0], DPAUXMON_VERSION_MAJOR, DPAUXMON_VERSION_MINOR, DPAUXMON_VERSION_RELEASE,
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NULL);
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extcap_base_register_interface(extcap_conf, DPAUXMON_EXTCAP_INTERFACE, "DisplayPort AUX channel monitor capture", 275, "DisplayPort AUX channel monitor");
|
|
|
|
help_header = g_strdup_printf(
|
|
" %s --extcap-interfaces\n"
|
|
" %s --extcap-interface=%s --extcap-dlts\n"
|
|
" %s --extcap-interface=%s --extcap-config\n"
|
|
" %s --extcap-interface=%s --interface_id 0 --fifo myfifo --capture",
|
|
argv[0], argv[0], DPAUXMON_EXTCAP_INTERFACE, argv[0], DPAUXMON_EXTCAP_INTERFACE, argv[0], DPAUXMON_EXTCAP_INTERFACE);
|
|
extcap_help_add_header(extcap_conf, help_header);
|
|
g_free(help_header);
|
|
extcap_help_add_option(extcap_conf, "--help", "print this help");
|
|
extcap_help_add_option(extcap_conf, "--version", "print the version");
|
|
extcap_help_add_option(extcap_conf, "--port <port> ", "the dpauxmon interface index");
|
|
|
|
opterr = 0;
|
|
optind = 0;
|
|
|
|
if (argc == 1) {
|
|
extcap_help_print(extcap_conf);
|
|
goto end;
|
|
}
|
|
|
|
while ((result = getopt_long(argc, argv, ":", longopts, &option_idx)) != -1) {
|
|
switch (result) {
|
|
|
|
case OPT_HELP:
|
|
extcap_help_print(extcap_conf);
|
|
ret = EXIT_SUCCESS;
|
|
goto end;
|
|
|
|
case OPT_VERSION:
|
|
extcap_version_print(extcap_conf);
|
|
goto end;
|
|
|
|
case OPT_INTERFACE_ID:
|
|
if (!ws_strtou32(optarg, NULL, &interface_id)) {
|
|
g_warning("Invalid interface id: %s", optarg);
|
|
goto end;
|
|
}
|
|
break;
|
|
|
|
case ':':
|
|
/* missing option argument */
|
|
g_warning("Option '%s' requires an argument", argv[optind - 1]);
|
|
break;
|
|
|
|
default:
|
|
if (!extcap_base_parse_options(extcap_conf, result - EXTCAP_OPT_LIST_INTERFACES, optarg)) {
|
|
g_warning("Invalid option: %s", argv[optind - 1]);
|
|
goto end;
|
|
}
|
|
}
|
|
}
|
|
|
|
extcap_cmdline_debug(argv, argc);
|
|
|
|
if (optind != argc) {
|
|
g_warning("Unexpected extra option: %s", argv[optind]);
|
|
goto end;
|
|
}
|
|
|
|
if (extcap_base_handle_interface(extcap_conf)) {
|
|
ret = EXIT_SUCCESS;
|
|
goto end;
|
|
}
|
|
|
|
if (extcap_conf->show_config) {
|
|
ret = list_config(extcap_conf->interface);
|
|
goto end;
|
|
}
|
|
|
|
if (extcap_conf->capture)
|
|
run_listener(extcap_conf->fifo, interface_id);
|
|
|
|
end:
|
|
/* clean up stuff */
|
|
extcap_base_cleanup(&extcap_conf);
|
|
return ret;
|
|
}
|