/* Copyright (C) 1998-2021 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see . */ /* Testing of some network related lookup functions. The system databases looked up are: - /etc/services - /etc/hosts - /etc/networks - /etc/protocols The tests try to be fairly generic and simple so that they work on every possible setup (and might therefore not detect some possible errors). */ #include #include #include #include #include #include #include #include #include #include #include "nss.h" #include /* The following define is necessary for glibc 2.0.6 */ #ifndef INET6_ADDRSTRLEN # define INET6_ADDRSTRLEN 46 #endif int error_count; static void output_servent (const char *call, struct servent *sptr) { char **pptr; if (sptr == NULL) printf ("Call: %s returned NULL\n", call); else { printf ("Call: %s, returned: s_name: %s, s_port: %d, s_proto: %s\n", call, sptr->s_name, ntohs(sptr->s_port), sptr->s_proto); for (pptr = sptr->s_aliases; *pptr != NULL; pptr++) printf (" alias: %s\n", *pptr); } } static void test_services (void) { struct servent *sptr; sptr = getservbyname ("domain", "tcp"); output_servent ("getservbyname (\"domain\", \"tcp\")", sptr); sptr = getservbyname ("domain", "udp"); output_servent ("getservbyname (\"domain\", \"udp\")", sptr); sptr = getservbyname ("domain", NULL); output_servent ("getservbyname (\"domain\", NULL)", sptr); sptr = getservbyname ("not-existant", NULL); output_servent ("getservbyname (\"not-existant\", NULL)", sptr); /* This shouldn't return anything. */ sptr = getservbyname ("", ""); output_servent ("getservbyname (\"\", \"\")", sptr); sptr = getservbyname ("", "tcp"); output_servent ("getservbyname (\"\", \"tcp\")", sptr); sptr = getservbyport (htons(53), "tcp"); output_servent ("getservbyport (htons(53), \"tcp\")", sptr); sptr = getservbyport (htons(53), NULL); output_servent ("getservbyport (htons(53), NULL)", sptr); sptr = getservbyport (htons(1), "udp"); /* shouldn't exist */ output_servent ("getservbyport (htons(1), \"udp\")", sptr); setservent (0); do { sptr = getservent (); output_servent ("getservent ()", sptr); } while (sptr != NULL); endservent (); } static void output_hostent (const char *call, struct hostent *hptr) { char **pptr; char buf[INET6_ADDRSTRLEN]; if (hptr == NULL) printf ("Call: %s returned NULL\n", call); else { printf ("Call: %s returned: name: %s, addr_type: %d\n", call, hptr->h_name, hptr->h_addrtype); if (hptr->h_aliases) for (pptr = hptr->h_aliases; *pptr != NULL; pptr++) printf (" alias: %s\n", *pptr); for (pptr = hptr->h_addr_list; *pptr != NULL; pptr++) printf (" ip: %s\n", inet_ntop (hptr->h_addrtype, *pptr, buf, sizeof (buf))); } } static void test_hosts (void) { struct hostent *hptr1, *hptr2; char *name = NULL; size_t namelen = 0; struct in_addr ip; hptr1 = gethostbyname ("localhost"); hptr2 = gethostbyname ("LocalHost"); if (hptr1 != NULL || hptr2 != NULL) { if (hptr1 == NULL) { printf ("localhost not found - but LocalHost found:-(\n"); ++error_count; } else if (hptr2 == NULL) { printf ("LocalHost not found - but localhost found:-(\n"); ++error_count; } else if (strcmp (hptr1->h_name, hptr2->h_name) != 0) { printf ("localhost and LocalHost have different canoncial name\n"); printf ("gethostbyname (\"localhost\")->%s\n", hptr1->h_name); printf ("gethostbyname (\"LocalHost\")->%s\n", hptr2->h_name); ++error_count; } else output_hostent ("gethostbyname(\"localhost\")", hptr1); } hptr1 = gethostbyname ("127.0.0.1"); output_hostent ("gethostbyname (\"127.0.0.1\")", hptr1); hptr1 = gethostbyname ("10.1234"); output_hostent ("gethostbyname (\"10.1234\")", hptr1); hptr1 = gethostbyname2 ("localhost", AF_INET); output_hostent ("gethostbyname2 (\"localhost\", AF_INET)", hptr1); while (gethostname (name, namelen) < 0 && errno == ENAMETOOLONG) { namelen += 2; /* tiny increments to test a lot */ name = xrealloc (name, namelen); } if (gethostname (name, namelen) == 0) { printf ("Hostname: %s\n", name); if (name != NULL) { hptr1 = gethostbyname (name); output_hostent ("gethostbyname (gethostname(...))", hptr1); } } ip.s_addr = htonl (INADDR_LOOPBACK); hptr1 = gethostbyaddr ((char *) &ip, sizeof (ip), AF_INET); if (hptr1 != NULL) { printf ("official name of 127.0.0.1: %s\n", hptr1->h_name); } sethostent (0); do { hptr1 = gethostent (); output_hostent ("gethostent ()", hptr1); } while (hptr1 != NULL); endhostent (); } static void output_netent (const char *call, struct netent *nptr) { char **pptr; if (nptr == NULL) printf ("Call: %s returned NULL\n", call); else { struct in_addr ip; ip.s_addr = htonl(nptr->n_net); printf ("Call: %s, returned: n_name: %s, network_number: %s\n", call, nptr->n_name, inet_ntoa (ip)); for (pptr = nptr->n_aliases; *pptr != NULL; pptr++) printf (" alias: %s\n", *pptr); } } static void test_network (void) { struct netent *nptr; uint32_t ip; /* This test needs the following line in /etc/networks: loopback 127.0.0.0 */ nptr = getnetbyname ("loopback"); output_netent ("getnetbyname (\"loopback\")",nptr); nptr = getnetbyname ("LoopBACK"); output_netent ("getnetbyname (\"LoopBACK\")",nptr); ip = inet_network ("127.0.0.0"); nptr = getnetbyaddr (ip, AF_INET); output_netent ("getnetbyaddr (inet_network (\"127.0.0.0\"), AF_INET)",nptr); setnetent (0); do { nptr = getnetent (); output_netent ("getnetent ()", nptr); } while (nptr != NULL); endnetent (); } static void output_protoent (const char *call, struct protoent *prptr) { char **pptr; if (prptr == NULL) printf ("Call: %s returned NULL\n", call); else { printf ("Call: %s, returned: p_name: %s, p_proto: %d\n", call, prptr->p_name, prptr->p_proto); for (pptr = prptr->p_aliases; *pptr != NULL; pptr++) printf (" alias: %s\n", *pptr); } } static void test_protocols (void) { struct protoent *prptr; prptr = getprotobyname ("IP"); output_protoent ("getprotobyname (\"IP\")", prptr); prptr = getprotobynumber (1); output_protoent ("getprotobynumber (1)", prptr); setprotoent (0); do { prptr = getprotoent (); output_protoent ("getprotoent ()", prptr); } while (prptr != NULL); endprotoent (); } /* Override /etc/nsswitch.conf for this program. This is mainly useful for developers. */ static void __attribute__ ((unused)) setdb (const char *dbname) { if (strcmp ("db", dbname)) { /* db is not implemented for hosts, networks */ __nss_configure_lookup ("hosts", dbname); __nss_configure_lookup ("networks", dbname); } __nss_configure_lookup ("protocols", dbname); __nss_configure_lookup ("services", dbname); } static int do_test (void) { /* setdb ("db"); */ test_hosts (); test_network (); test_protocols (); test_services (); if (error_count) printf ("\n %d errors occurred!\n", error_count); else printf ("No visible errors occurred!\n"); return (error_count != 0); } #include