Sorry, I sent the incomplete sample program.
So, I send the complete one again.
Any comments welcom.
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <stropts.h>
#include <fcntl.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <linux/if_ether.h>
#include <linux/netconsole.h>
#define NETCONSOLE_DEV_NAME "/dev/netconsole"
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
struct command {
char *name;
char *options;
int (*handle_command)(struct command* command,
int argc, char* argv[]);
void (*usage)(char *msg);
};
extern char *optarg;
extern int opterr, optind, errno;
static void generic_usage(char *msg) {
fprintf(stderr, "Usage : netconfig command [option] [args]\n");
fprintf(stderr, "command: add remove help\n");
exit(-1);
}
static int handle_command_add(struct command* command, int argc, char** argv)
{
int i, fd, ch;
unsigned int address;
unsigned char mac[ETH_ALEN];
struct netconsole_request req = {
.netdev_name = "eth0",
.local_port = 6665,
.remote_port = 6666,
.remote_mac = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},
};
while ((ch = getopt(argc, argv, command->options)) != -1) {
switch (ch) {
case 'p':
req.local_port = atoi(optarg);
break;
case 's':
address = inet_addr(optarg);
if (address == -1)
(*command->usage)("invlid IP address!\n");
req.local_ip = address;
break;
case 'h':
default:
(*command->usage)(NULL);
}
}
argc -= optind;
argv += optind;
if (argc < 3 || argc > 4)
(*command->usage)(NULL);
memcpy(req.netdev_name, argv[0], IFNAMSIZ);
address = inet_addr(argv[1]);
if (address == -1)
(*command->usage)("invlid IP address!\n");
req.remote_ip = address;
req.remote_port = atoi(argv[2]);
if (argc == 4) {
i = 0;
mac[i++] = strtol(argv[3], NULL, 16);
while ((argv[3] = strchr(argv[3], ':')) != NULL) {
argv[3]++;
mac[i++] = strtol(argv[3], NULL, 16);
}
if (i != ETH_ALEN)
(*command->usage)("Invalid MAC address!\n");
memcpy(req.remote_mac, mac, ETH_ALEN);
}
fd = open(NETCONSOLE_DEV_NAME, O_RDWR);
if (fd < 0) {
fprintf(stderr, "cannot open device" NETCONSOLE_DEV_NAME "\n");
return -1;
}
if(ioctl(fd, NETCON_ADD_TARGET, &req) != 0)
perror("add");
close(fd);
return 0;
}
static void usage_add(char *msg)
{
if (msg != NULL)
fprintf(stderr, "%s", msg);
fprintf(stderr, "Usage : netconfig add [-options] dev_name remote_ip "
"remote_port [remote_mac]\n");
fprintf(stderr, "options:\n");
fprintf(stderr, " -p local_port :local port number\n");
fprintf(stderr, " -s local_up :local IP address\n");
exit(-1);
}
static int handle_command_remove(struct command *command,
int argc, char** argv)
{
int fd, id, ch;
while ((ch = getopt(argc, argv, command->options)) != -1) {
switch (ch) {
case 'h':
default:
(*command->usage)(NULL);
}
}
argc -= optind;
argv += optind;
if (argc != 1)
(*command->usage)(NULL);
id = atoi(argv[0]);
fd = open(NETCONSOLE_DEV_NAME, O_RDWR);
if (fd < 0) {
fprintf(stderr, "can't open device " NETCONSOLE_DEV_NAME "\n");
return -1;
}
if(ioctl(fd, NETCON_REMOVE_TARGET, &id) != 0)
perror("remove");
close(fd);
return 0;
}
static void usage_remove(char *msg) {
fprintf(stderr, "Usage : netconfig remove id\n");
exit(-1);
}
static int handle_command_help(struct command *command,
int argc, char** argv) {
(*command->usage)(NULL);
return 0;
}
static void usage_help(char *msg) {
generic_usage(NULL);
}
static struct command s_commands[] = {
{"add", "hp:s:", handle_command_add, usage_add},
{"remove", "hp:", handle_command_remove, usage_remove},
{"help", NULL, handle_command_help, usage_help},
};
int main(int argc, char* argv[]) {
int i;
struct command *command = NULL;
for(i = 0; i < ARRAY_SIZE(s_commands); i++) {
if (argc <= 1)
break;
if (strcmp(s_commands[i].name, argv[1]) == 0) {
command = &s_commands[i];
break;
}
}
if (command == NULL)
generic_usage(NULL);
argc--;
argv++;
if (command->handle_command)
(*command->handle_command)(command, argc, argv);
else {
fprintf(stderr, "function handle_command() isn't set.");
exit(-1);
}
return 0;
}
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