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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
static void print_help()
{
printf("ebtablesu v"PROGVERSION" ("PROGDATE")\n");
printf(
"Usage:\n"
"ebtablesu open table : copy the kernel table\n"
"ebtablesu fopen table file : copy the table from the specified file\n"
"ebtablesu free table : remove the table from memory\n"
"ebtablesu commit table : commit the table to the kernel\n"
"ebtablesu fcommit table file : commit the table to the specified file\n\n"
"ebtablesu <ebtables options> : the ebtables specifications\n"
" use spaces only to separate options and commands\n"
"For the ebtables options, see\n# ebtables -h\nor\n# man ebtables\n"
);
}
int main(int argc, char *argv[])
{
char *arguments, *pos;
int i, writefd, len = 0;
if (argc > EBTD_ARGC_MAX) {
fprintf(stderr, "ebtablesd accepts at most %d arguments, %d "
"arguments were specified. If you need this many "
"arguments, recompile this tool with a higher value for"
" EBTD_ARGC_MAX.\n", EBTD_ARGC_MAX - 1, argc - 1);
return -1;
} else if (argc == 1) {
fprintf(stderr, "At least one argument is needed.\n");
print_help();
exit(0);
}
for (i = 0; i < argc; i++)
len += strlen(argv[i]);
/* Don't forget '\0' */
len += argc;
if (len > EBTD_CMDLINE_MAXLN) {
fprintf(stderr, "ebtablesd has a maximum command line argument "
"length of %d, an argument length of %d was received. "
"If a smaller length is unfeasible, recompile this tool "
"with a higher value for EBTD_CMDLINE_MAXLN.\n",
EBTD_CMDLINE_MAXLN, len);
return -1;
}
if (!strcmp(argv[1], "-h") || !strcmp(argv[1], "--help")) {
if (argc != 2) {
fprintf(stderr, "%s does not accept options.\n", argv[1]);
return -1;
}
print_help();
exit(0);
}
if (!(arguments = (char *)malloc(len))) {
fprintf(stderr, "ebtablesu: out of memory.\n");
return -1;
}
if ((writefd = open(EBTD_PIPE, O_WRONLY, 0)) == -1) {
fprintf(stderr, "Could not open the pipe, perhaps ebtablesd is "
"not running or you don't have write permission (try "
"running as root).\n");
return -1;
}
pos = arguments;
for (i = 0; i < argc; i++) {
strcpy(pos, argv[i]);
pos += strlen(argv[i]);
*(pos++) = ' ';
}
*(pos-1) = '\n';
if (write(writefd, arguments, len) == -1) {
perror("write");
return -1;
}
return 0;
}
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