ipaddr_remote segfaults on domain names, not actually tested?

[wusspuss]

Adaptation from the tutorial:

#include <libdill.h>
#include <stdio.h>

int main() {
  struct ipaddr addr;
  int rc = ipaddr_remote(&addr, "example.org", 80, 0, -1);
  if (rc != 0) {
    printf("rc=%i,errno=%i\n",rc,errno);
    return 1;
  }
   
  return 0;
}

Sometimes prints rc=-1,errno=99 (not a valid errno), sometimes segfaults straight away. If you swap "example.org" for "127.0.0.1" it works just fine. From grepping tests/ for ipaddr_remote it seems it's only tested for 0.0.0.0 and 127.0.0.1 and not domain names.

[jkylander]

Same here when doing the sockets tutorial. Compiled with clang -Wall -Wextra -g -o wget wget.c -ldill
gdb --args ./wget https www.example.org /index.html

20   struct ipaddr addr;
21   int rc = ipaddr_remote(&addr, argv[2], port, 0, -1);

[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7f866e0 in dill_ipaddr_remotes (addrs=0x7fffffffe4bc, naddrs=1, name=<optimized out>, port=443, mode=<optimized out>,
    deadline=-1) at ipaddr.c:377
377             if(naddrs && mode == DILL_IPADDR_IPV4 && it->ai_family == AF_INET) {
(gdb) bt
#0  0x00007ffff7f866e0 in dill_ipaddr_remotes (addrs=0x7fffffffe4bc, naddrs=1, name=<optimized out>, port=443, mode=<optimized out>,
    deadline=-1) at ipaddr.c:377
#1  0x00007ffff7f8653c in dill_ipaddr_remotes (addrs=0x7fffffffe4bc, naddrs=naddrs@entry=1, name=0x7fffffffe976 "www.example.org",
    port=443, mode=<optimized out>, deadline=-1) at ipaddr.c:296
#2  0x00007ffff7f86a2d in dill_ipaddr_remote (addr=<optimized out>, name=<optimized out>, port=<optimized out>, mode=<optimized out>,
    deadline=<optimized out>) at ipaddr.c:261
#3  0x00005555555552ac in main (argc=4, argv=0x7fffffffe618) at wget.c:21