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#include <arpa/inet.h>
#include <ctype.h>
#include <netdb.h>
#include <netinet/in.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct hostent *gethostbyname(const char *name) {
// TODO ipv4 addresses should just get copied
static struct hostent he;
static struct in_addr addr;
static void *addrs[2] = {NULL, NULL};
bool found = false;
char buf[256];
FILE *fp;
if (he.h_name) {
free(he.h_name);
he.h_name = NULL;
}
if ((fp = fopen("/usr/share/hosts", "r")) == NULL) {
return NULL;
}
while (!found && fgets(buf, sizeof buf, fp)) {
char *s;
if (!isdigit(buf[0])) continue;
s = strtok(buf, " \t\n");
if (!inet_aton(s, &addr)) continue;
while ((s = strtok(NULL, " \t\n"))) {
if (strcmp(s, name) == 0) {
found = true;
break;
}
}
}
fclose(fp);
if (!found) {
return NULL;
}
he.h_name = strdup(name);
he.h_aliases = NULL;
he.h_addrtype = AF_INET;
he.h_length = 4;
he.h_addr_list = (void*)&addrs;
addrs[0] = &addr.s_addr;
return &he;
}
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