+++ /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 <netdb.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 <sys/types.h>
-#include <linux/can/raw.h>
-#include <linux/can/canethgw.h>
-
-unsigned int cegw_errno = 0;
-
-static const char help_msg[] = "usage:\n"
- " %s <can_if>[,filter]* <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 more udp recipients.\n"
- " The can filter is specified in the same way as in candump utility.\n";
-
-struct addrinfo hints = {
- .ai_socktype = SOCK_DGRAM
-};
-
-/**
- * readsockaddr - 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. Please note that
- * the function modifies content of arg.
- *
- * @param[in] arg hostname:port string
- * @param[out] addr filled sockaddr_in structure
- * @return 0 on success, -1 otherwise
- */
-int readsockaddr(char *arg, struct sockaddr *addr, int ai_family)
-{
- int ret;
- char *delim;
- struct addrinfo *res;
-
- delim = strchr(arg, ':');
-
- if (delim == NULL) {
- fprintf(stderr, "expected ':' (<hostname>:<port>)");
- exit(1);
- }
-
- *delim = '\0';
- delim++;
-
- hints.ai_family = ai_family;
-
- ret = getaddrinfo(arg, delim, &hints, &res);
- if (ret != 0) {
- fprintf(stderr, "getaddrinfo failed: %s\n", gai_strerror(ret));
- exit(1);
- }
-
- memcpy(addr, res->ai_addr, res->ai_addrlen);
-
- freeaddrinfo(res);
- return 0;
-}
-
-/**
- * readfilter - reads can filter definition from nptr
- */
-int readfilter(char *nptr, struct can_filter **filter, int *out_numfilter, can_err_mask_t *err_mask)
-{
- char *ptr;
- int numfilter;
- struct can_filter *rfilter;
-
- numfilter = 0;
- ptr = nptr;
- while (ptr) {
- numfilter++;
- ptr++; /* hop behind the ',' */
- ptr = strchr(ptr, ','); /* exit condition */
- }
-
- rfilter = malloc(numfilter * sizeof(*rfilter));
- if (!rfilter) {
- fprintf(stderr, "filter malloc failed");
- exit(1);
- }
-
- numfilter = 0;
- *err_mask = 0;
-
- while (nptr) {
-
- ptr = nptr+1; /* hop behind the ',' */
- nptr = strchr(ptr, ','); /* update exit condition */
-
- if (sscanf(ptr, "%x:%x",
- &rfilter[numfilter].can_id,
- &rfilter[numfilter].can_mask) == 2) {
- rfilter[numfilter].can_mask &= ~CAN_ERR_FLAG;
- numfilter++;
- } else if (sscanf(ptr, "%x~%x",
- &rfilter[numfilter].can_id,
- &rfilter[numfilter].can_mask) == 2) {
- rfilter[numfilter].can_id |= CAN_INV_FILTER;
- rfilter[numfilter].can_mask &= ~CAN_ERR_FLAG;
- numfilter++;
- } else if (sscanf(ptr, "#%x", err_mask) != 1) {
- fprintf(stderr, "filter parsing failed");
- exit(1);
- }
- }
-
- *filter = rfilter;
- *out_numfilter = numfilter;
- return 0;
-}
-
-int main(int argc, char *argv[])
-{
- int i;
- int fd;
- int tmpi;
- int dstcnt;
- char *nptr;
- int numfilter = 0;
- int udp_sock, can_sock;
- int addrlen;
- can_err_mask_t err_mask = 0;
- struct sockaddr_can can_addr;
- struct sockaddr *dst = NULL;
- struct cegw_ioctl *gwctl = NULL;
- struct can_filter *filter = NULL;
-
- /* udp_addr can store both - in and in6 addresses */
- struct sockaddr_in6 udp6_addr;
- struct sockaddr *udp_addr = (struct sockaddr *) &udp6_addr;
-
-
- if (argc == 1 || (argc == 2 && strcmp(argv[1], "-h") == 0)) {
- printf(help_msg, argv[0], argv[0]);
- return 0;
- }
-
- if (argc < 4) {
- fprintf(stderr, "not enough arguments\n");
- printf(help_msg, argv[0], argv[0]);
- return 1;
- }
-
- dstcnt = argc-3;
-
- for (i=1; i<argc; i++) {
- switch (i) {
- case 1: /* can ifindex */
- nptr = strchr(argv[i], ',');
- if (nptr) {
- *nptr = '\0';
- }
-
- can_addr.can_family = AF_CAN;
- tmpi = if_nametoindex(argv[i]);
- if (tmpi == 0) {
- fprintf(stderr, "given can interface not found\n");
- return 1;
- }
-
- can_addr.can_ifindex = tmpi;
- break;
- case 2: /* listen addr */
- readsockaddr(argv[i], udp_addr, AF_UNSPEC);
- switch (udp_addr->sa_family) {
- case AF_INET:
- addrlen = sizeof(struct sockaddr_in);
- break;
- case AF_INET6:
- addrlen = sizeof(struct sockaddr_in6);
- break;
- default:
- fprintf(stderr, "unexpected sockaddr family");
- break;
- }
- gwctl = (struct cegw_ioctl*)malloc(sizeof(*gwctl) + dstcnt*addrlen);
- break;
- default: /* udp destination */
- dst = (struct sockaddr *)(gwctl->udp_dst + (i-3)*addrlen);
- readsockaddr(argv[i], dst, udp_addr->sa_family);
-
- break;
- }
- }
-
- /* prepare udp socket */
- udp_sock = socket(udp_addr->sa_family, SOCK_DGRAM, IPPROTO_UDP);
- if (udp_sock == -1) {
- perror("udp socket(..)");
- return 1;
- }
-
- if (bind(udp_sock, udp_addr, addrlen) != 0) {
- perror("bind(udp)");
- return 1;
- }
-
- /* prepare can socket */
- can_sock = socket(PF_CAN, SOCK_RAW, CAN_RAW);
- if (can_sock == -1) {
- perror("can socket(..)");
- return 1;
- }
-
- if (bind(can_sock, (struct sockaddr *)&can_addr, sizeof(struct sockaddr_can)) != 0) {
- perror("bind(can)");
- return 1;
- }
-
- /* can filter */
- if (nptr)
- readfilter(nptr, &filter, &numfilter, &err_mask);
-
- if (err_mask)
- setsockopt(can_sock, SOL_CAN_RAW, CAN_RAW_ERR_FILTER,
- &err_mask, sizeof(err_mask));
-
- if (numfilter)
- setsockopt(can_sock, SOL_CAN_RAW, CAN_RAW_FILTER,
- filter, numfilter * sizeof(struct can_filter));
- free(filter);
-
- /* send it to kernel gateway */
- fd = open("/dev/canethgw", O_RDONLY);
- if (fd == -1) {
- perror("/dev/canethgw");
- return 1;
- }
-
- gwctl->can_sock = can_sock;
- gwctl->udp_sock = udp_sock;
- gwctl->udp_dstcnt = dstcnt;
- gwctl->udp_addrlen = addrlen;
-
- if (ioctl(fd, CEGW_IOCTL_START, gwctl) != 0) {
- perror("ioctl");
- return 1;
- }
- printf("gateway successfully set and running\n");
- free(gwctl);
-
- /* sleep until someone kills me */
- pause();
-
- return 0;
-}
projects / can-eth-gw.git / blobdiff