#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 <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;
-enum
-{
+enum {
CEGW_ERR_UNKNOWN,
CEGW_ERR_COLON,
- CEGW_ERR_UNEXLEN,
- CEGW_ERR_ATON,
- CEGW_ERR_PORT
+ CEGW_ERR_GETADDRI,
+ CEGW_ERR_FLTALCK,
+ CEGW_ERR_FLTPARSE
};
-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"
+char *cegw_errlist[] = {
+
+ [CEGW_ERR_UNKNOWN ] = "",
+ [CEGW_ERR_COLON ] = "expected ':' (<hostname>:<port>)",
+ [CEGW_ERR_GETADDRI] = "getaddrinfo failed",
+ [CEGW_ERR_FLTALCK ] = "filter alloc failed",
+ [CEGW_ERR_FLTPARSE] = "filter parsing failed"
};
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"
+ " %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 any number\n"
- " of udp recipients.\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";
+
+const struct addrinfo hints = {
+ .ai_family = AF_INET,
+ .ai_socktype = SOCK_DGRAM
+};
-static void perr(char* s)
+static void perr(char *s)
{
if (s) {
if (cegw_errno == 0) {
}
/**
- * read_addrport - parses @in for eth address.
+ * 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.
+ * the cause is stored in cegw_errno. Please note that
+ * the function modifies content of arg.
*
- * @param[in] in string to search in
- * @param[out] addr ip address
- * @param[out] port transport layer port
+ * @param[in] arg hostname:port string
+ * @param[out] addr filled sockaddr_in structure
* @return 0 on success, -1 otherwise
*/
-int read_addrport(char* in, struct in_addr* addr, unsigned short* port)
+int readsockaddr(char *arg, struct sockaddr_in *addr)
{
- char* delim = NULL;
- const int addrstr_len = 16;
- char addrstr[addrstr_len];
- int addrlen;
+ int ret;
+ char *delim;
+ struct addrinfo *res;
+
+ delim = strchr(arg, ':');
- if ((delim = strchr(in, ':')) == NULL) {
+ if (delim == NULL) {
cegw_errno = CEGW_ERR_COLON;
return -1;
}
- /* get address */
- addrlen = delim - in;
- if (addrlen > addrstr_len) {
- cegw_errno = CEGW_ERR_UNEXLEN;
+ *delim = '\0';
+ delim++;
+
+ ret = getaddrinfo(arg, delim, &hints, &res);
+ if (ret != 0) {
+ fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(ret));
+ cegw_errno = CEGW_ERR_GETADDRI;
return -1;
}
- memcpy(addrstr, in, addrlen);
- addrstr[addrlen] = '\0';
- if (inet_aton(addrstr, addr) == 0) {
- cegw_errno = CEGW_ERR_ATON;
- return -1;
+ memcpy(addr, res->ai_addr, sizeof(*addr));
+
+ 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 */
}
- /* get port */
- /* ToDo: handle overflow */
- if (sscanf(delim, ":%hu", port) != 1) {
- cegw_errno = CEGW_ERR_PORT;
+ rfilter = malloc(numfilter * sizeof(*rfilter));
+ if (!rfilter) {
+ cegw_errno = CEGW_ERR_FLTALCK;
return -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) {
+ cegw_errno = CEGW_ERR_FLTPARSE;
+ free(rfilter);
+ return -1;
+ }
+ }
+
+ *filter = rfilter;
+ *out_numfilter = numfilter;
return 0;
}
-int main(int argc, char* argv[])
+int main(int argc, char *argv[])
{
int i;
int fd;
int tmpi;
int dstcnt;
- unsigned short port;
+ char *nptr;
+ int numfilter = 0;
int udp_sock, can_sock;
+ can_err_mask_t err_mask = 0;
struct sockaddr_in udp_addr;
struct sockaddr_can can_addr;
- struct sockaddr_in* dst = NULL;
- struct cegw_ioctl* gwctl = NULL;
+ struct sockaddr_in *dst = NULL;
+ struct cegw_ioctl *gwctl = NULL;
+ struct can_filter *filter = NULL;
- if (argc == 1)
- {
+ if (argc == 1) {
printf(help_msg, argv[0], argv[0]);
return 0;
}
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) {
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");
+ if (readsockaddr(argv[i], &udp_addr) != 0) {
+ perr("reading listening address failed");
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");
+ if (readsockaddr(argv[i], dst) != 0) {
+ perr("reading udp destination failed");
free(gwctl);
return 1;
}
- dst->sin_port = htons(port);
break;
}
}
return 1;
}
+ /* can filter */
+ if (nptr && (readfilter(nptr, &filter, &numfilter, &err_mask) != 0)) {
+ perr("can filter");
+ free(gwctl);
+ return 1;
+ }
+
+ 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) {
return 0;
}
+
projects / can-eth-gw.git / commitdiff