--- /dev/null
+/*
+ * Copyright: (c) 2012 Czech Technical University in Prague
+ *
+ * Authors:
+ * Radek Matějka <radek.matejka@gmail.com>
+ * Michal Sojka <sojkam1@fel.cvut.cz>
+ *
+ * Funded by: Volkswagen Group Research
+ *
+ * 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.
+ */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <net/if.h>
+#include <arpa/inet.h>
+#include <linux/can.h>
+#include <limits.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <linux/can/canethgw.h>
+
+unsigned int cegw_errno = 0;
+
+enum
+{
+ CEGW_ERR_UNKNOWN,
+ CEGW_ERR_COLON,
+ CEGW_ERR_UNEXLEN,
+ CEGW_ERR_ATON,
+ CEGW_ERR_PORT
+};
+
+char* cegw_errlist[] =
+{
+ [CEGW_ERR_UNKNOWN] = "",
+ [CEGW_ERR_COLON ] = "expected ':' (<ip>:<port>)",
+ [CEGW_ERR_UNEXLEN] = "unexpected ip address length, please use dot notation"
+ " (eg. 127.0.0.1)",
+ [CEGW_ERR_ATON ] = "ip address mismatch",
+ [CEGW_ERR_PORT ] = "port number"
+};
+
+static const char help_msg[] = "usage:\n"
+ " %s <can_if> <udp_listen_addr>:<port> <udp_dest_addr>:<port>\n"
+ " [list of additional udp recipients <addr:port>]\n"
+ "example:\n"
+ " %s can0 192.168.0.1:10501 192.168.0.4:980 192.168.0.7:1160\n\n"
+ " Executing this command will set the gateway so that it will\n"
+ " listen for udp messages on 192.168.0.1:10501 and send them\n"
+ " to can0. Simultaneously, it will send all messages from can0\n"
+ " to 192.168.0.4:980 and 192.168.0.7:1160 via udp. The message is\n"
+ " therefore cloned. Notice that there can be any number\n"
+ " of udp recipients.\n";
+
+static void perr(char* s)
+{
+ if (s) {
+ if (cegw_errno == 0) {
+ fprintf(stderr, "error: %s\n", s);
+
+ } else {
+ fprintf(stderr, "error: %s, %s\n", s, cegw_errlist[cegw_errno]);
+ }
+ return;
+ }
+
+ fprintf(stderr, "error: %s\n", cegw_errlist[cegw_errno]);
+}
+
+/**
+ * read_addrport - parses @in for eth address.
+ * Valid input is e.g. 127.0.0.1:10502. If parsing fails
+ * the cause is stored in cegw_errno.
+ *
+ * @param[in] in string to search in
+ * @param[out] addr ip address
+ * @param[out] port transport layer port
+ * @return 0 on success, -1 otherwise
+ */
+int read_addrport(char* in, struct in_addr* addr, unsigned short* port)
+{
+ char* delim = NULL;
+ const int addrstr_len = 16;
+ char addrstr[addrstr_len];
+ int addrlen;
+
+ if ((delim = strchr(in, ':')) == NULL) {
+ cegw_errno = CEGW_ERR_COLON;
+ return -1;
+ }
+
+ /* get address */
+ addrlen = delim - in;
+ if (addrlen > addrstr_len) {
+ cegw_errno = CEGW_ERR_UNEXLEN;
+ return -1;
+ }
+
+ memcpy(addrstr, in, addrlen);
+ addrstr[addrlen] = '\0';
+ if (inet_aton(addrstr, addr) == 0) {
+ cegw_errno = CEGW_ERR_ATON;
+ return -1;
+ }
+
+ /* get port */
+ /* ToDo: handle overflow */
+ if (sscanf(delim, ":%hu", port) != 1) {
+ cegw_errno = CEGW_ERR_PORT;
+ return -1;
+ }
+
+ return 0;
+}
+
+int main(int argc, char* argv[])
+{
+ int i;
+ int fd;
+ int tmpi;
+ int dstcnt;
+ unsigned short port;
+ int udp_sock, can_sock;
+ struct sockaddr_in udp_addr;
+ struct sockaddr_can can_addr;
+ struct sockaddr_in* dst = NULL;
+ struct cegw_ioctl* gwctl = NULL;
+
+ if (argc == 1)
+ {
+ printf(help_msg, argv[0], argv[0]);
+ return 0;
+ }
+
+ if (argc < 4) {
+ perr("not enough arguments");
+ printf(help_msg, argv[0], argv[0]);
+ /* ToDo: print usage */
+ return 1;
+ }
+
+ dstcnt = argc-3;
+ gwctl = (struct cegw_ioctl*)malloc(sizeof(*gwctl) + (dstcnt)*sizeof(struct sockaddr_in));
+
+ for (i=1; i<argc; i++) {
+ switch (i) {
+ case 1: /* can ifindex */
+ can_addr.can_family = AF_CAN;
+ tmpi = if_nametoindex(argv[i]);
+ if (tmpi == 0) {
+ perr("given can interface not found");
+ free(gwctl);
+ return 1;
+ }
+ can_addr.can_ifindex = tmpi;
+ break;
+ case 2: /* listen addr */
+ udp_addr.sin_family = AF_INET;
+ if (read_addrport(argv[i], &udp_addr.sin_addr, &port) != 0) {
+ perr("listening address mismatch");
+ free(gwctl);
+ return 1;
+ }
+ udp_addr.sin_port = htons(port);
+ break;
+ default: /* udp destination */
+ dst = &gwctl->udp_dst[i-3];
+ dst->sin_family = AF_INET;
+ if (read_addrport(argv[i], &dst->sin_addr, &port) != 0) {
+ perr("udp destination mismatch");
+ free(gwctl);
+ return 1;
+ }
+ dst->sin_port = htons(port);
+ break;
+ }
+ }
+
+ /* prepare udp socket */
+ udp_sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
+ if (udp_sock == -1) {
+ perror("udp socket()");
+ free(gwctl);
+ return 1;
+ }
+
+ if (bind(udp_sock, (struct sockaddr *)&udp_addr, sizeof(struct sockaddr_in)) != 0) {
+ perror("bind(udp)");
+ free(gwctl);
+ return 1;
+ }
+
+ /* prepare can socket */
+ can_sock = socket(PF_CAN, SOCK_RAW, CAN_RAW);
+ if (can_sock == -1) {
+ perror("can socket()");
+ free(gwctl);
+ return 1;
+ }
+
+ if (bind(can_sock, (struct sockaddr *)&can_addr, sizeof(struct sockaddr_can)) != 0) {
+ perror("bind(can)");
+ free(gwctl);
+ return 1;
+ }
+
+ /* send it to kernel gateway */
+ fd = open("/dev/canethgw", O_RDONLY);
+ if (fd == -1) {
+ perror("/dev/canethgw");
+ free(gwctl);
+ return 1;
+ }
+
+ gwctl->can_sock = can_sock;
+ gwctl->udp_sock = udp_sock;
+ gwctl->udp_dstcnt = dstcnt;
+ gwctl->udp_addrlen = sizeof(struct sockaddr_in);
+
+ if (ioctl(fd, CEGW_IOCTL_START, gwctl) != 0) {
+ perror("ioctl");
+ free(gwctl);
+ return 1;
+ }
+ printf("gateway successfully set and running\n");
+ free(gwctl);
+
+ /* sleep until someone kills me */
+ pause();
+
+ return 0;
+}
projects / can-utils.git / commitdiff