int __nss_hostname_digits_dots_context (struct resolv_context *ctx, const char *name, struct hostent *resbuf, char **buffer, size_t *buffer_size, size_t buflen, struct hostent **result, enum nss_status *status, int af, int *h_errnop) { int save; /* * disallow names consisting only of digits/dots, unless * they end in a dot. */ if (isdigit (name[0]) || isxdigit (name[0]) || name[0] == ':') { const char *cp; char *hostname; typedef unsigned char host_addr_t[16]; host_addr_t *host_addr; typedef char *host_addr_list_t[2]; host_addr_list_t *h_addr_ptrs; char **h_alias_ptr; size_t size_needed; int addr_size; switch (af) { case AF_INET: addr_size = INADDRSZ; break; case AF_INET6: addr_size = IN6ADDRSZ; break; default: af = res_use_inet6 () ? AF_INET6 : AF_INET; addr_size = af == AF_INET6 ? IN6ADDRSZ : INADDRSZ; break; } size_needed = (sizeof (*host_addr) + sizeof (*h_addr_ptrs) + sizeof (*h_alias_ptr) + strlen (name) + 1); if (buffer_size == NULL) { if (buflen < size_needed) { *status = NSS_STATUS_TRYAGAIN; if (h_errnop != NULL) *h_errnop = NETDB_INTERNAL; __set_errno (ERANGE); goto done; } } else if (buffer_size != NULL && *buffer_size < size_needed) { char *new_buf; *buffer_size = size_needed; new_buf = (char *) realloc (*buffer, *buffer_size); if (new_buf == NULL) { save = errno; free (*buffer); *buffer = NULL; *buffer_size = 0; __set_errno (save); if (h_errnop != NULL) *h_errnop = NETDB_INTERNAL; *result = NULL; goto done; } *buffer = new_buf; } memset (*buffer, '\0', size_needed); host_addr = (host_addr_t *) *buffer; h_addr_ptrs = (host_addr_list_t *) ((char *) host_addr + sizeof (*host_addr)); h_alias_ptr = (char **) ((char *) h_addr_ptrs + sizeof (*h_addr_ptrs)); hostname = (char *) h_alias_ptr + sizeof (*h_alias_ptr); if (isdigit (name[0])) { for (cp = name;; ++cp) { if (*cp == '\0') { int ok; if (*--cp == '.') break; /* All-numeric, no dot at the end. Fake up a hostent as if we'd actually done a lookup. What if someone types 255.255.255.255? The test below will succeed spuriously... ??? */ if (af == AF_INET) ok = __inet_aton (name, (struct in_addr *) host_addr); else { assert (af == AF_INET6); ok = inet_pton (af, name, host_addr) > 0; } if (! ok) { *h_errnop = HOST_NOT_FOUND; if (buffer_size == NULL) *status = NSS_STATUS_NOTFOUND; else *result = NULL; goto done; } resbuf->h_name = strcpy (hostname, name); h_alias_ptr[0] = NULL; resbuf->h_aliases = h_alias_ptr; (*h_addr_ptrs)[0] = (char *) host_addr; (*h_addr_ptrs)[1] = NULL; resbuf->h_addr_list = *h_addr_ptrs; if (af == AF_INET && res_use_inet6 ()) { /* We need to change the IP v4 address into the IP v6 address. */ char tmp[INADDRSZ]; char *p = (char *) host_addr; int i; /* Save a copy of the IP v4 address. */ memcpy (tmp, host_addr, INADDRSZ); /* Mark this ipv6 addr as a mapped ipv4. */ for (i = 0; i < 10; i++) *p++ = 0x00; *p++ = 0xff; *p++ = 0xff; /* Copy the IP v4 address. */ memcpy (p, tmp, INADDRSZ); resbuf->h_addrtype = AF_INET6; resbuf->h_length = IN6ADDRSZ; } else { resbuf->h_addrtype = af; resbuf->h_length = addr_size; } if (h_errnop != NULL) *h_errnop = NETDB_SUCCESS; if (buffer_size == NULL) *status = NSS_STATUS_SUCCESS; else *result = resbuf; goto done; } if (!isdigit (*cp) && *cp != '.') break; } } if ((isxdigit (name[0]) && strchr (name, ':') != NULL) || name[0] == ':') { switch (af) { default: af = res_use_inet6 () ? AF_INET6 : AF_INET; if (af == AF_INET6) { addr_size = IN6ADDRSZ; break; } /* FALLTHROUGH */ case AF_INET: /* This is not possible. We cannot represent an IPv6 address in an `struct in_addr' variable. */ *h_errnop = HOST_NOT_FOUND; if (buffer_size == NULL) *status = NSS_STATUS_NOTFOUND; else *result = NULL; goto done; case AF_INET6: addr_size = IN6ADDRSZ; break; } for (cp = name;; ++cp) { if (!*cp) { if (*--cp == '.') break; /* All-IPv6-legal, no dot at the end. Fake up a hostent as if we'd actually done a lookup. */ if (inet_pton (AF_INET6, name, host_addr) <= 0) { *h_errnop = HOST_NOT_FOUND; if (buffer_size == NULL) *status = NSS_STATUS_NOTFOUND; else *result = NULL; goto done; } resbuf->h_name = strcpy (hostname, name); h_alias_ptr[0] = NULL; resbuf->h_aliases = h_alias_ptr; (*h_addr_ptrs)[0] = (char *) host_addr; (*h_addr_ptrs)[1] = (char *) 0; resbuf->h_addr_list = *h_addr_ptrs; resbuf->h_addrtype = AF_INET6; resbuf->h_length = addr_size; *h_errnop = NETDB_SUCCESS; if (buffer_size == NULL) *status = NSS_STATUS_SUCCESS; else *result = resbuf; goto done; } if (!isxdigit (*cp) && *cp != ':' && *cp != '.') break; } } } return 0; done: return 1; }
in_addr_t inet_addr(const char *p) { struct in_addr a; if (!__inet_aton(p, &a)) return -1; return a.s_addr; }
/* This function has to be reachable by res_data.c but not publically. */ int __res_vinit(res_state statp, int preinit) { FILE *fp; char *cp, **pp; int n; char buf[BUFSIZ]; int nserv = 0; /* number of nameservers read from file */ int have_serv6 = 0; int haveenv = 0; int havesearch = 0; #ifdef RESOLVSORT int nsort = 0; char *net; #endif #ifndef RFC1535 int dots; #endif #ifdef _LIBC statp->_u._ext.initstamp = __res_initstamp; #endif if (!preinit) { statp->retrans = RES_TIMEOUT; statp->retry = RES_DFLRETRY; statp->options = RES_DEFAULT; statp->id = res_randomid(); } statp->nscount = 0; statp->ndots = 1; statp->pfcode = 0; statp->_vcsock = -1; statp->_flags = 0; statp->qhook = NULL; statp->rhook = NULL; statp->_u._ext.nscount = 0; for (n = 0; n < MAXNS; n++) statp->_u._ext.nsaddrs[n] = NULL; /* Allow user to override the local domain definition */ if ((cp = getenv("LOCALDOMAIN")) != NULL) { (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); statp->defdname[sizeof(statp->defdname) - 1] = '\0'; haveenv++; /* * Set search list to be blank-separated strings * from rest of env value. Permits users of LOCALDOMAIN * to still have a search list, and anyone to set the * one that they want to use as an individual (even more * important now that the rfc1535 stuff restricts searches) */ cp = statp->defdname; pp = statp->dnsrch; *pp++ = cp; for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { if (*cp == '\n') /* silly backwards compat */ break; else if (*cp == ' ' || *cp == '\t') { *cp = 0; n = 1; } else if (n) { *pp++ = cp; n = 0; havesearch = 1; } } /* null terminate last domain if there are excess */ while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') cp++; *cp = '\0'; *pp++ = 0; } #define MATCH(line, name) \ (!strncmp(line, name, sizeof(name) - 1) && \ (line[sizeof(name) - 1] == ' ' || \ line[sizeof(name) - 1] == '\t')) if ((fp = fopen(_PATH_RESCONF, "rce")) != NULL) { /* No threads use this stream. */ __fsetlocking (fp, FSETLOCKING_BYCALLER); /* read the config file */ while (__fgets_unlocked(buf, sizeof(buf), fp) != NULL) { /* skip comments */ if (*buf == ';' || *buf == '#') continue; /* read default domain name */ if (MATCH(buf, "domain")) { if (haveenv) /* skip if have from environ */ continue; cp = buf + sizeof("domain") - 1; while (*cp == ' ' || *cp == '\t') cp++; if ((*cp == '\0') || (*cp == '\n')) continue; strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); statp->defdname[sizeof(statp->defdname) - 1] = '\0'; if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) *cp = '\0'; havesearch = 0; continue; } /* set search list */ if (MATCH(buf, "search")) { if (haveenv) /* skip if have from environ */ continue; cp = buf + sizeof("search") - 1; while (*cp == ' ' || *cp == '\t') cp++; if ((*cp == '\0') || (*cp == '\n')) continue; strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); statp->defdname[sizeof(statp->defdname) - 1] = '\0'; if ((cp = strchr(statp->defdname, '\n')) != NULL) *cp = '\0'; /* * Set search list to be blank-separated strings * on rest of line. */ cp = statp->defdname; pp = statp->dnsrch; *pp++ = cp; for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { if (*cp == ' ' || *cp == '\t') { *cp = 0; n = 1; } else if (n) { *pp++ = cp; n = 0; } } /* null terminate last domain if there are excess */ while (*cp != '\0' && *cp != ' ' && *cp != '\t') cp++; *cp = '\0'; *pp++ = 0; havesearch = 1; continue; } /* read nameservers to query */ if (MATCH(buf, "nameserver") && nserv < MAXNS) { struct in_addr a; cp = buf + sizeof("nameserver") - 1; while (*cp == ' ' || *cp == '\t') cp++; if ((*cp != '\0') && (*cp != '\n') && __inet_aton(cp, &a)) { statp->nsaddr_list[nserv].sin_addr = a; statp->nsaddr_list[nserv].sin_family = AF_INET; statp->nsaddr_list[nserv].sin_port = htons(NAMESERVER_PORT); nserv++; #ifdef _LIBC } else { struct in6_addr a6; char *el; if ((el = strpbrk(cp, " \t\n")) != NULL) *el = '\0'; if ((el = strchr(cp, SCOPE_DELIMITER)) != NULL) *el = '\0'; if ((*cp != '\0') && (__inet_pton(AF_INET6, cp, &a6) > 0)) { struct sockaddr_in6 *sa6; sa6 = malloc(sizeof(*sa6)); if (sa6 != NULL) { sa6->sin6_family = AF_INET6; sa6->sin6_port = htons(NAMESERVER_PORT); sa6->sin6_flowinfo = 0; sa6->sin6_addr = a6; if (__glibc_likely (el == NULL)) sa6->sin6_scope_id = 0; else { int try_numericscope = 1; if (IN6_IS_ADDR_LINKLOCAL (&a6) || IN6_IS_ADDR_MC_LINKLOCAL (&a6)) { sa6->sin6_scope_id = __if_nametoindex (el + 1); if (sa6->sin6_scope_id != 0) try_numericscope = 0; } if (try_numericscope) { char *end; sa6->sin6_scope_id = (uint32_t) strtoul (el + 1, &end, 10); if (*end != '\0') sa6->sin6_scope_id = 0; } } statp->nsaddr_list[nserv].sin_family = 0; statp->_u._ext.nsaddrs[nserv] = sa6; statp->_u._ext.nssocks[nserv] = -1; have_serv6 = 1; nserv++; } } #endif } continue; } #ifdef RESOLVSORT if (MATCH(buf, "sortlist")) { struct in_addr a; cp = buf + sizeof("sortlist") - 1; while (nsort < MAXRESOLVSORT) { while (*cp == ' ' || *cp == '\t') cp++; if (*cp == '\0' || *cp == '\n' || *cp == ';') break; net = cp; while (*cp && !ISSORTMASK(*cp) && *cp != ';' && isascii(*cp) && !isspace(*cp)) cp++; n = *cp; *cp = 0; if (__inet_aton(net, &a)) { statp->sort_list[nsort].addr = a; if (ISSORTMASK(n)) { *cp++ = n; net = cp; while (*cp && *cp != ';' && isascii(*cp) && !isspace(*cp)) cp++; n = *cp; *cp = 0; if (__inet_aton(net, &a)) { statp->sort_list[nsort].mask = a.s_addr; } else { statp->sort_list[nsort].mask = net_mask(statp->sort_list[nsort].addr); } } else { statp->sort_list[nsort].mask = net_mask(statp->sort_list[nsort].addr); } nsort++; } *cp = n; } continue; } #endif if (MATCH(buf, "options")) { res_setoptions(statp, buf + sizeof("options") - 1, "conf"); continue; } } statp->nscount = nserv; #ifdef _LIBC if (have_serv6) { /* We try IPv6 servers again. */ statp->ipv6_unavail = false; } #endif #ifdef RESOLVSORT statp->nsort = nsort; #endif (void) fclose(fp); } if (__builtin_expect(statp->nscount == 0, 0)) { statp->nsaddr.sin_addr = __inet_makeaddr(IN_LOOPBACKNET, 1); statp->nsaddr.sin_family = AF_INET; statp->nsaddr.sin_port = htons(NAMESERVER_PORT); statp->nscount = 1; } if (statp->defdname[0] == 0 && __gethostname(buf, sizeof(statp->defdname) - 1) == 0 && (cp = strchr(buf, '.')) != NULL) strcpy(statp->defdname, cp + 1); /* find components of local domain that might be searched */ if (havesearch == 0) { pp = statp->dnsrch; *pp++ = statp->defdname; *pp = NULL; #ifndef RFC1535 dots = 0; for (cp = statp->defdname; *cp; cp++) dots += (*cp == '.'); cp = statp->defdname; while (pp < statp->dnsrch + MAXDFLSRCH) { if (dots < LOCALDOMAINPARTS) break; cp = __rawmemchr(cp, '.') + 1; /* we know there is one */ *pp++ = cp; dots--; } *pp = NULL; #ifdef DEBUG if (statp->options & RES_DEBUG) { printf(";; res_init()... default dnsrch list:\n"); for (pp = statp->dnsrch; *pp; pp++) printf(";;\t%s\n", *pp); printf(";;\t..END..\n"); } #endif #endif /* !RFC1535 */ } if ((cp = getenv("RES_OPTIONS")) != NULL) res_setoptions(statp, cp, "env"); statp->options |= RES_INIT; return (0); }
/* This function has to be reachable by res_data.c but not publically. */ int __res_vinit(res_state statp, int preinit) { register FILE *fp; register char *cp, **pp; register int n; char buf[BUFSIZ]; int nserv = 0; /* number of nameserver records read from file */ #ifdef _LIBC int nservall = 0; /* number of NS records read, nserv IPv4 only */ #endif int haveenv = 0; int havesearch = 0; #ifdef RESOLVSORT int nsort = 0; char *net; #endif #ifndef RFC1535 int dots; #endif if (!preinit) { statp->retrans = RES_TIMEOUT; statp->retry = RES_DFLRETRY; statp->options = RES_DEFAULT; statp->id = res_randomid(); } #ifdef USELOOPBACK statp->nsaddr.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); #else statp->nsaddr.sin_addr.s_addr = INADDR_ANY; #endif statp->nsaddr.sin_family = AF_INET; statp->nsaddr.sin_port = htons(NAMESERVER_PORT); statp->nscount = 1; statp->ndots = 1; statp->pfcode = 0; statp->_vcsock = -1; statp->_flags = 0; statp->qhook = NULL; statp->rhook = NULL; statp->_u._ext.nsinit = 0; statp->_u._ext.nscount = 0; #ifdef _LIBC statp->_u._ext.nscount6 = 0; for (n = 0; n < MAXNS; n++) statp->_u._ext.nsaddrs[n] = NULL; #endif /* Allow user to override the local domain definition */ if ((cp = getenv("LOCALDOMAIN")) != NULL) { (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); statp->defdname[sizeof(statp->defdname) - 1] = '\0'; haveenv++; /* * Set search list to be blank-separated strings * from rest of env value. Permits users of LOCALDOMAIN * to still have a search list, and anyone to set the * one that they want to use as an individual (even more * important now that the rfc1535 stuff restricts searches) */ cp = statp->defdname; pp = statp->dnsrch; *pp++ = cp; for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { if (*cp == '\n') /* silly backwards compat */ break; else if (*cp == ' ' || *cp == '\t') { *cp = 0; n = 1; } else if (n) { *pp++ = cp; n = 0; havesearch = 1; } } /* null terminate last domain if there are excess */ while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') cp++; *cp = '\0'; *pp++ = 0; } #define MATCH(line, name) \ (!strncmp(line, name, sizeof(name) - 1) && \ (line[sizeof(name) - 1] == ' ' || \ line[sizeof(name) - 1] == '\t')) if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) { /* No threads use this stream. */ __fsetlocking (fp, FSETLOCKING_BYCALLER); /* read the config file */ while (fgets_unlocked(buf, sizeof(buf), fp) != NULL) { /* skip comments */ if (*buf == ';' || *buf == '#') continue; /* read default domain name */ if (MATCH(buf, "domain")) { if (haveenv) /* skip if have from environ */ continue; cp = buf + sizeof("domain") - 1; while (*cp == ' ' || *cp == '\t') cp++; if ((*cp == '\0') || (*cp == '\n')) continue; strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); statp->defdname[sizeof(statp->defdname) - 1] = '\0'; if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) *cp = '\0'; havesearch = 0; continue; } /* set search list */ if (MATCH(buf, "search")) { if (haveenv) /* skip if have from environ */ continue; cp = buf + sizeof("search") - 1; while (*cp == ' ' || *cp == '\t') cp++; if ((*cp == '\0') || (*cp == '\n')) continue; strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); statp->defdname[sizeof(statp->defdname) - 1] = '\0'; if ((cp = strchr(statp->defdname, '\n')) != NULL) *cp = '\0'; /* * Set search list to be blank-separated strings * on rest of line. */ cp = statp->defdname; pp = statp->dnsrch; *pp++ = cp; for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { if (*cp == ' ' || *cp == '\t') { *cp = 0; n = 1; } else if (n) { *pp++ = cp; n = 0; } } /* null terminate last domain if there are excess */ while (*cp != '\0' && *cp != ' ' && *cp != '\t') cp++; *cp = '\0'; *pp++ = 0; havesearch = 1; continue; } /* read nameservers to query */ #ifdef _LIBC if (MATCH(buf, "nameserver") && nservall < MAXNS) { #else if (MATCH(buf, "nameserver") && nserv < MAXNS) { #endif struct in_addr a; cp = buf + sizeof("nameserver") - 1; while (*cp == ' ' || *cp == '\t') cp++; if ((*cp != '\0') && (*cp != '\n') && __inet_aton(cp, &a)) { statp->nsaddr_list[nserv].sin_addr = a; statp->nsaddr_list[nserv].sin_family = AF_INET; statp->nsaddr_list[nserv].sin_port = htons(NAMESERVER_PORT); nserv++; #ifdef _LIBC nservall++; } else { struct in6_addr a6; char *el; if ((el = strchr(cp, '\n')) != NULL) *el = '\0'; if ((*cp != '\0') && (inet_pton(AF_INET6, cp, &a6) > 0)) { struct sockaddr_in6 *sa6; sa6 = malloc(sizeof(*sa6)); if (sa6 != NULL) { sa6->sin6_addr = a6; sa6->sin6_family = AF_INET6; sa6->sin6_port = htons(NAMESERVER_PORT); statp->_u._ext.nsaddrs[nservall] = sa6; statp->_u._ext.nstimes[nservall] = RES_MAXTIME; statp->_u._ext.nssocks[nservall] = -1; nservall++; } } #endif } continue; } #ifdef RESOLVSORT if (MATCH(buf, "sortlist")) { struct in_addr a; cp = buf + sizeof("sortlist") - 1; while (nsort < MAXRESOLVSORT) { while (*cp == ' ' || *cp == '\t') cp++; if (*cp == '\0' || *cp == '\n' || *cp == ';') break; net = cp; while (*cp && !ISSORTMASK(*cp) && *cp != ';' && isascii(*cp) && !isspace(*cp)) cp++; n = *cp; *cp = 0; if (__inet_aton(net, &a)) { statp->sort_list[nsort].addr = a; if (ISSORTMASK(n)) { *cp++ = n; net = cp; while (*cp && *cp != ';' && isascii(*cp) && !isspace(*cp)) cp++; n = *cp; *cp = 0; if (__inet_aton(net, &a)) { statp->sort_list[nsort].mask = a.s_addr; } else { statp->sort_list[nsort].mask = net_mask(statp->sort_list[nsort].addr); } } else { statp->sort_list[nsort].mask = net_mask(statp->sort_list[nsort].addr); } nsort++; } *cp = n; } continue; } #endif if (MATCH(buf, "options")) { res_setoptions(statp, buf + sizeof("options") - 1, "conf"); continue; } } if (nserv > 1) statp->nscount = nserv; #ifdef _LIBC if (nservall - nserv > 0) statp->_u._ext.nscount6 = nservall - nserv; #endif #ifdef RESOLVSORT statp->nsort = nsort; #endif (void) fclose(fp); } if (statp->defdname[0] == 0 && __gethostname(buf, sizeof(statp->defdname) - 1) == 0 && (cp = strchr(buf, '.')) != NULL) strcpy(statp->defdname, cp + 1); /* find components of local domain that might be searched */ if (havesearch == 0) { pp = statp->dnsrch; *pp++ = statp->defdname; *pp = NULL; #ifndef RFC1535 dots = 0; for (cp = statp->defdname; *cp; cp++) dots += (*cp == '.'); cp = statp->defdname; while (pp < statp->dnsrch + MAXDFLSRCH) { if (dots < LOCALDOMAINPARTS) break; cp = __rawmemchr(cp, '.') + 1; /* we know there is one */ *pp++ = cp; dots--; } *pp = NULL; #ifdef DEBUG if (statp->options & RES_DEBUG) { printf(";; res_init()... default dnsrch list:\n"); for (pp = statp->dnsrch; *pp; pp++) printf(";;\t%s\n", *pp); printf(";;\t..END..\n"); } #endif #endif /* !RFC1535 */ } if ((cp = getenv("RES_OPTIONS")) != NULL) res_setoptions(statp, cp, "env"); statp->options |= RES_INIT; return (0); } static void internal_function res_setoptions(res_state statp, const char *options, const char *source) { const char *cp = options; int i; #ifdef DEBUG if (statp->options & RES_DEBUG) printf(";; res_setoptions(\"%s\", \"%s\")...\n", options, source); #endif while (*cp) { /* skip leading and inner runs of spaces */ while (*cp == ' ' || *cp == '\t') cp++; /* search for and process individual options */ if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { i = atoi(cp + sizeof("ndots:") - 1); if (i <= RES_MAXNDOTS) statp->ndots = i; else statp->ndots = RES_MAXNDOTS; #ifdef DEBUG if (statp->options & RES_DEBUG) printf(";;\tndots=%d\n", statp->ndots); #endif } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { i = atoi(cp + sizeof("timeout:") - 1); if (i <= RES_MAXRETRANS) statp->retrans = i; else statp->retrans = RES_MAXRETRANS; } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ i = atoi(cp + sizeof("attempts:") - 1); if (i <= RES_MAXRETRY) statp->retry = i; else statp->retry = RES_MAXRETRY; } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { #ifdef DEBUG if (!(statp->options & RES_DEBUG)) { printf(";; res_setoptions(\"%s\", \"%s\")..\n", options, source); statp->options |= RES_DEBUG; } printf(";;\tdebug\n"); #endif } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { statp->options |= RES_USE_INET6; } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { statp->options |= RES_ROTATE; } else if (!strncmp(cp, "no-check-names", sizeof("no-check-names") - 1)) { statp->options |= RES_NOCHECKNAME; } else { /* XXX - print a warning here? */ } /* skip to next run of spaces */ while (*cp && *cp != ' ' && *cp != '\t') cp++; } } #ifdef RESOLVSORT /* XXX - should really support CIDR which means explicit masks always. */ static u_int32_t net_mask(in) /* XXX - should really use system's version of this */ struct in_addr in; { register u_int32_t i = ntohl(in.s_addr); if (IN_CLASSA(i)) return (htonl(IN_CLASSA_NET)); else if (IN_CLASSB(i)) return (htonl(IN_CLASSB_NET)); return (htonl(IN_CLASSC_NET)); } #endif u_int res_randomid(void) { struct timeval now; __gettimeofday(&now, NULL); return (0xffff & (now.tv_sec ^ now.tv_usec ^ __getpid())); } /* * This routine is for closing the socket if a virtual circuit is used and * the program wants to close it. This provides support for endhostent() * which expects to close the socket. * * This routine is not expected to be user visible. */ void res_nclose(res_state statp) { int ns; if (statp->_vcsock >= 0) { (void) __close(statp->_vcsock); statp->_vcsock = -1; statp->_flags &= ~(RES_F_VC | RES_F_CONN); } #ifdef _LIBC for (ns = 0; ns < statp->_u._ext.nscount + statp->_u._ext.nscount6; ns++) #else for (ns = 0; ns < statp->_u._ext.nscount; ns++) #endif { if (statp->_u._ext.nssocks[ns] != -1) { (void) __close(statp->_u._ext.nssocks[ns]); statp->_u._ext.nssocks[ns] = -1; } } statp->_u._ext.nsinit = 0; }