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token-ring-hacks/mac_table.c

78 lines
1.5 KiB

#include <string.h>
#include <errno.h>
#include <stdio.h>
#include <errno.h>
#include "mac_table.h"
#include "utils.h"
bool mac_table_contains(struct mac_table *tbl, const uint8_t *addr)
{
unsigned int i;
for (i = 0; i < tbl->num_entries; i++) {
if (!memcmp(tbl->addr[i], addr, 6))
return true;
}
return false;
}
int mac_table_add(struct mac_table *tbl, const uint8_t *addr)
{
if (tbl->num_entries == MAC_TABLE_SIZE-1)
return -ENOSPC;
memcpy(tbl->addr[tbl->num_entries++], addr, 6);
return 0;
}
void mac_table_init(struct mac_table *tbl, const char *name)
{
memset(tbl, 0, sizeof(*tbl));
tbl->name = name;
}
int mac_table_read(struct mac_table *tbl, const char *fname)
{
FILE *f = fopen(fname, "r");
unsigned int num = 0;
char line[256];
if (!f) {
fprintf(stderr, "Cannot open mac table %s: %s\n", fname, strerror(errno));
return -errno;
}
printf("Reading MAC table %s from file %s...\n", tbl->name, fname);
while (fgets(line, sizeof(line), f)) {
uint8_t addr[6];
int rc;
if (line[strlen(line)-1] == '\n')
line[strlen(line)-1] = 0;
if (strlen(line) < 1)
continue;
/* skip comments */
if (line[0] == ';' || line[9] == '#')
continue;
rc = sscanf(line, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
&addr[0], &addr[1], &addr[2], &addr[3], &addr[4], &addr[5]);
if (rc != 6) {
fprintf(stderr, "%s: Cannot parse line '%s'\n", tbl->name, line);
continue;
}
printf("%s: Read MAC address %s\n", tbl->name, mac2str(addr));
mac_table_add(tbl, addr);
num++;
}
fclose(f);
return num;
}