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feat: configure /etc/hosts #8

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feat: configure /etc/hosts #8

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32 changes: 32 additions & 0 deletions src/main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -284,6 +284,37 @@ static void configure_nsswitch_conf(void)
"DNS redirect may not work.");
}

static void configure_hosts_conf(void)
{
int fd;
char path[] = "/tmp/nsproxy-hosts-conf-XXXXXX";
const char *content = "127.0.0.1 localhost\n";

if ((fd = mkstemp(path)) == -1)
goto failed_on_create;

if (chmod(path, 0644) == -1)
goto failed_after_create;

if (write(fd, content, strlen(content)) == -1)
goto failed_after_create;

if (mount(path, "/etc/hosts", NULL, MS_BIND | MS_RDONLY, NULL) ==
-1)
goto failed_after_create;

close(fd);
unlink(path);
return;

failed_after_create:
close(fd);
unlink(path);
failed_on_create:
loglv(0, "Warning: re-bind /etc/hosts failed. "
"DNS redirect may not work.");
}

/* send a file descriptor to sock
must succeed, otherwise terminate this process */
static void send_fd(int sock, int fd)
Expand Down Expand Up @@ -463,6 +494,7 @@ static int child(int sk, struct loopconf *conf, char *cmd[])

if (conf->dnstype != DNS_REDIR_OFF) {
if (unshare_mount() == 0) {
configure_hosts_conf();
configure_resolv_conf();
configure_nsswitch_conf();
}
Expand Down