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feature: add ip-alias option.

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This commit is contained in:
Nick Peng
2023-08-16 22:47:47 +08:00
parent c19a39a447
commit 1054229efb
10 changed files with 638 additions and 96 deletions
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49
src/util.c
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@@ -156,6 +156,55 @@ errout:
return NULL;
}
int generate_random_addr(unsigned char *addr, int addr_len, int mask)
{
if (mask / 8 > addr_len) {
return -1;
}
int offset = mask / 8;
int bit = 0;
for (int i = offset; i < addr_len; i++) {
bit = 0xFF;
if (i == offset) {
bit = ~(0xFF << (8 - mask % 8)) & 0xFF;
}
addr[i] = jhash(&addr[i], 1, 0) & bit;
}
return 0;
}
int generate_addr_map(unsigned char *addr_from, unsigned char *addr_to, unsigned char *addr_out, int addr_len, int mask)
{
if ((mask / 8) >= addr_len) {
if (mask % 8 != 0) {
return -1;
}
}
int offset = mask / 8;
int bit = mask % 8;
for (int i = 0; i < offset; i++) {
addr_out[i] = addr_to[i];
}
if (bit != 0) {
int mask1 = 0xFF >> bit;
int mask2 = (0xFF << (8 - bit)) & 0xFF;
addr_out[offset] = addr_from[offset] & mask1;
addr_out[offset] |= addr_to[offset] & mask2;
offset = offset + 1;
}
for (int i = offset; i < addr_len; i++) {
addr_out[i] = addr_from[i];
}
return 0;
}
int getaddr_by_host(const char *host, struct sockaddr *addr, socklen_t *addr_len)
{
struct addrinfo hints;