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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
236 lines
4.4 KiB
C
236 lines
4.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* ucon.c
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*
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* Copyright (c) 2004+ Evgeniy Polyakov <zbr@ioremap.net>
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*/
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#include <asm/types.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/poll.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include <arpa/inet.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <time.h>
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#include <getopt.h>
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#include <linux/connector.h>
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#define DEBUG
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#define NETLINK_CONNECTOR 11
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/* Hopefully your userspace connector.h matches this kernel */
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#define CN_TEST_IDX CN_NETLINK_USERS + 3
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#define CN_TEST_VAL 0x456
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#ifdef DEBUG
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#define ulog(f, a...) fprintf(stdout, f, ##a)
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#else
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#define ulog(f, a...) do {} while (0)
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#endif
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static int need_exit;
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static __u32 seq;
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static int netlink_send(int s, struct cn_msg *msg)
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{
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struct nlmsghdr *nlh;
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unsigned int size;
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int err;
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char buf[128];
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struct cn_msg *m;
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size = NLMSG_SPACE(sizeof(struct cn_msg) + msg->len);
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nlh = (struct nlmsghdr *)buf;
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nlh->nlmsg_seq = seq++;
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nlh->nlmsg_pid = getpid();
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nlh->nlmsg_type = NLMSG_DONE;
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nlh->nlmsg_len = size;
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nlh->nlmsg_flags = 0;
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m = NLMSG_DATA(nlh);
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#if 0
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ulog("%s: [%08x.%08x] len=%u, seq=%u, ack=%u.\n",
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__func__, msg->id.idx, msg->id.val, msg->len, msg->seq, msg->ack);
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#endif
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memcpy(m, msg, sizeof(*m) + msg->len);
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err = send(s, nlh, size, 0);
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if (err == -1)
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ulog("Failed to send: %s [%d].\n",
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strerror(errno), errno);
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return err;
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}
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static void usage(void)
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{
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printf(
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"Usage: ucon [options] [output file]\n"
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"\n"
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"\t-h\tthis help screen\n"
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"\t-s\tsend buffers to the test module\n"
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"\n"
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"The default behavior of ucon is to subscribe to the test module\n"
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"and wait for state messages. Any ones received are dumped to the\n"
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"specified output file (or stdout). The test module is assumed to\n"
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"have an id of {%u.%u}\n"
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"\n"
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"If you get no output, then verify the cn_test module id matches\n"
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"the expected id above.\n"
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, CN_TEST_IDX, CN_TEST_VAL
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);
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}
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int main(int argc, char *argv[])
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{
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int s;
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char buf[1024];
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int len;
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struct nlmsghdr *reply;
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struct sockaddr_nl l_local;
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struct cn_msg *data;
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FILE *out;
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time_t tm;
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struct pollfd pfd;
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bool send_msgs = false;
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while ((s = getopt(argc, argv, "hs")) != -1) {
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switch (s) {
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case 's':
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send_msgs = true;
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break;
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case 'h':
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usage();
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return 0;
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default:
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/* getopt() outputs an error for us */
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usage();
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return 1;
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}
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}
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if (argc != optind) {
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out = fopen(argv[optind], "a+");
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if (!out) {
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ulog("Unable to open %s for writing: %s\n",
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argv[1], strerror(errno));
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out = stdout;
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}
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} else
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out = stdout;
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memset(buf, 0, sizeof(buf));
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s = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
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if (s == -1) {
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perror("socket");
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return -1;
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}
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l_local.nl_family = AF_NETLINK;
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l_local.nl_groups = -1; /* bitmask of requested groups */
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l_local.nl_pid = 0;
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ulog("subscribing to %u.%u\n", CN_TEST_IDX, CN_TEST_VAL);
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if (bind(s, (struct sockaddr *)&l_local, sizeof(struct sockaddr_nl)) == -1) {
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perror("bind");
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close(s);
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return -1;
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}
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#if 0
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{
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int on = 0x57; /* Additional group number */
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setsockopt(s, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, &on, sizeof(on));
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}
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#endif
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if (send_msgs) {
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int i, j;
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memset(buf, 0, sizeof(buf));
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data = (struct cn_msg *)buf;
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data->id.idx = CN_TEST_IDX;
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data->id.val = CN_TEST_VAL;
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data->seq = seq++;
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data->ack = 0;
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data->len = 0;
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for (j=0; j<10; ++j) {
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for (i=0; i<1000; ++i) {
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len = netlink_send(s, data);
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}
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ulog("%d messages have been sent to %08x.%08x.\n", i, data->id.idx, data->id.val);
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}
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return 0;
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}
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pfd.fd = s;
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while (!need_exit) {
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pfd.events = POLLIN;
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pfd.revents = 0;
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switch (poll(&pfd, 1, -1)) {
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case 0:
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need_exit = 1;
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break;
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case -1:
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if (errno != EINTR) {
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need_exit = 1;
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break;
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}
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continue;
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}
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if (need_exit)
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break;
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memset(buf, 0, sizeof(buf));
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len = recv(s, buf, sizeof(buf), 0);
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if (len == -1) {
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perror("recv buf");
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close(s);
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return -1;
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}
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reply = (struct nlmsghdr *)buf;
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switch (reply->nlmsg_type) {
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case NLMSG_ERROR:
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fprintf(out, "Error message received.\n");
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fflush(out);
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break;
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case NLMSG_DONE:
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data = (struct cn_msg *)NLMSG_DATA(reply);
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time(&tm);
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fprintf(out, "%.24s : [%x.%x] [%08u.%08u].\n",
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ctime(&tm), data->id.idx, data->id.val, data->seq, data->ack);
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fflush(out);
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break;
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default:
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break;
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}
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}
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close(s);
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return 0;
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}
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