示例#1
0
文件: res_init.c 项目: chiehwen/olibc
/* This function has to be reachable by res_data.c but not publicly. */
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 */
	int haveenv = 0;
	int havesearch = 0;
	int nsort = 0;
	char *net;
	int dots;
	union res_sockaddr_union u[2];
#if defined(ANDROID_CHANGES) && ANDROID_CHANGES
        pid_t mypid = getpid();
        int use_proc_props = 0;
        int found_prop;
	char dnsProperty[PROP_VALUE_MAX];
#endif

        if ((statp->options & RES_INIT) != 0U)
                res_ndestroy(statp);

	if (!preinit) {
		statp->retrans = RES_TIMEOUT;
		statp->retry = RES_DFLRETRY;
		statp->options = RES_DEFAULT;
		statp->id = res_randomid();
	}

	memset(u, 0, sizeof(u));
#ifdef USELOOPBACK
	u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
#else
	u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
#endif
	u[nserv].sin.sin_family = AF_INET;
	u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
#ifdef HAVE_SA_LEN
	u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
#endif
	nserv++;
#ifdef HAS_INET6_STRUCTS
#ifdef USELOOPBACK
	u[nserv].sin6.sin6_addr = in6addr_loopback;
#else
	u[nserv].sin6.sin6_addr = in6addr_any;
#endif
	u[nserv].sin6.sin6_family = AF_INET6;
	u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
#ifdef HAVE_SA_LEN
	u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
#endif
	nserv++;
#endif
	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;
	statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
	if (statp->_u._ext.ext != NULL) {
	        memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
		statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
		strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
		strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
	}
	statp->nsort = 0;
	res_setservers(statp, u, nserv);

#if 0 /* IGNORE THE ENVIRONMENT */
	/* 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;
	}
	if (nserv > 0)
		statp->nscount = nserv;
#endif
#if defined(ANDROID_CHANGES) && defined(PROPERTY_SYSTEM_SUPPORT) /* READ FROM SYSTEM PROPERTIES */
	dns_last_change_counter = _get_dns_change_count();

	nserv = 0;
	for(n = 1; n <= MAX_DNS_PROPERTIES && nserv < MAXNS; n++) {
		char propname[PROP_NAME_MAX];
		char propvalue[PROP_VALUE_MAX];

		struct addrinfo hints, *ai;
		char sbuf[NI_MAXSERV];
		const size_t minsiz = sizeof(statp->_u._ext.ext->nsaddrs[0]);

		/*
		 * Check first for process-specific properties, and if those don't
		 * exist, try the generic properties.
		 */
		found_prop = 0;
		if (n == 1 || use_proc_props) {
			snprintf(propname, sizeof(propname), "%s%d.%d", DNS_PROP_NAME_PREFIX, n, mypid);
			if(__system_property_get(propname, propvalue) < 1) {
				if (use_proc_props) {
					break;
				}
			} else {
				found_prop = 1;
				use_proc_props = 1;
			}
		}
		if (!found_prop) {
			snprintf(propname, sizeof(propname), "%s%d", DNS_PROP_NAME_PREFIX, n);
			if(__system_property_get(propname, propvalue) < 1) {
				break;
			}
		}

		cp = propvalue;

		while (*cp == ' ' || *cp == '\t')
			cp++;
		cp[strcspn(cp, ";# \t\n")] = '\0';
		if ((*cp != '\0') && (*cp != '\n')) {
			memset(&hints, 0, sizeof(hints));
			hints.ai_family = PF_UNSPEC;
			hints.ai_socktype = SOCK_DGRAM;	/*dummy*/
			hints.ai_flags = AI_NUMERICHOST;
			sprintf(sbuf, "%u", NAMESERVER_PORT);
			if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
			    (size_t)ai->ai_addrlen <= minsiz) {
				if (statp->_u._ext.ext != NULL) {
					memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
					       ai->ai_addr, ai->ai_addrlen);
				}
				if ((size_t)ai->ai_addrlen <=
				    sizeof(statp->nsaddr_list[nserv])) {
					memcpy(&statp->nsaddr_list[nserv],
					       ai->ai_addr, ai->ai_addrlen);
				} else {
					statp->nsaddr_list[nserv].sin_family = 0;
				}
				freeaddrinfo(ai);
				nserv++;
			}
		}
	}

	/* Add the domain search list */
	havesearch = load_domain_search_list(statp);
#else /* !ANDROID_CHANGES - IGNORE resolv.conf in Android */
#define	MATCH(line, name) \
	(!strncmp(line, name, sizeof(name) - 1) && \
	(line[sizeof(name) - 1] == ' ' || \
	 line[sizeof(name) - 1] == '\t'))

	nserv = 0;
	if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
	    /* read the config file */
	    while (fgets(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 addrinfo hints, *ai;
		    char sbuf[NI_MAXSERV];
		    const size_t minsiz =
		        sizeof(statp->_u._ext.ext->nsaddrs[0]);

		    cp = buf + sizeof("nameserver") - 1;
		    while (*cp == ' ' || *cp == '\t')
			cp++;
		    cp[strcspn(cp, ";# \t\n")] = '\0';
		    if ((*cp != '\0') && (*cp != '\n')) {
			memset(&hints, 0, sizeof(hints));
			hints.ai_family = PF_UNSPEC;
			hints.ai_socktype = SOCK_DGRAM;	/*dummy*/
			hints.ai_flags = AI_NUMERICHOST;
			sprintf(sbuf, "%u", NAMESERVER_PORT);
			if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
			    ai->ai_addrlen <= minsiz) {
			    if (statp->_u._ext.ext != NULL) {
				memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
				    ai->ai_addr, ai->ai_addrlen);
			    }
			    if (ai->ai_addrlen <=
			        sizeof(statp->nsaddr_list[nserv])) {
				memcpy(&statp->nsaddr_list[nserv],
				    ai->ai_addr, ai->ai_addrlen);
			    } else
				statp->nsaddr_list[nserv].sin_family = 0;
			    freeaddrinfo(ai);
			    nserv++;
			}
		    }
		    continue;
		}
		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((unsigned char)*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((unsigned char)*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;
		}
		if (MATCH(buf, "options")) {
		    res_setoptions(statp, buf + sizeof("options") - 1, "conf");
		    continue;
		}
	    }
	    if (nserv > 0)
		statp->nscount = nserv;
	    statp->nsort = nsort;
	    (void) fclose(fp);
	}
#endif /* !ANDROID_CHANGES */
/*
 * Last chance to get a nameserver.  This should not normally
 * be necessary
 */
#ifdef NO_RESOLV_CONF
	if(nserv == 0)
		nserv = get_nameservers(statp);
#endif

	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;

		dots = 0;
		for (cp = statp->defdname; *cp; cp++)
			dots += (*cp == '.');

		cp = statp->defdname;
		while (pp < statp->dnsrch + MAXDFLSRCH) {
			if (dots < LOCALDOMAINPARTS)
				break;
			cp = strchr(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
	}

	if ((cp = getenv("RES_OPTIONS")) != NULL)
		res_setoptions(statp, cp, "env");
	if (nserv > 0) {
		statp->nscount = nserv;
		statp->options |= RES_INIT;
	}
	return (0);
}
示例#2
0
/* 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);
}
示例#3
0
文件: res_init.c 项目: mariuz/haiku
/*% 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 path[PATH_MAX];
	char buf[BUFSIZ];
	int nserv = 0;    /*%< number of nameserver records read from file */
	int haveenv = 0;
	int havesearch = 0;
#ifdef RESOLVSORT
	int nsort = 0;
	char *net;
#endif
	int dots;
	union res_sockaddr_union u[2];
	int maxns = MAXNS;

	RES_SET_H_ERRNO(statp, 0);
	if (statp->_u._ext.ext != NULL)
		res_ndestroy(statp);

	if (!preinit) {
		statp->retrans = RES_TIMEOUT;
		statp->retry = RES_DFLRETRY;
		statp->options = RES_DEFAULT;
		res_rndinit(statp);
		statp->id = res_nrandomid(statp);
	}

	memset(u, 0, sizeof(u));
#ifdef USELOOPBACK
	u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
#else
	u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
#endif
	u[nserv].sin.sin_family = AF_INET;
	u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
#ifdef HAVE_SA_LEN
	u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
#endif
	nserv++;
#ifdef HAS_INET6_STRUCTS
#ifdef USELOOPBACK
	u[nserv].sin6.sin6_addr = in6addr_loopback;
#else
	u[nserv].sin6.sin6_addr = in6addr_any;
#endif
	u[nserv].sin6.sin6_family = AF_INET6;
	u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
#ifdef HAVE_SA_LEN
	u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
#endif
	nserv++;
#endif
	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;
	statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
	if (statp->_u._ext.ext != NULL) {
	        memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
		statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
		strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
		strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
	} else {
		/*
		 * Historically res_init() rarely, if at all, failed.
		 * Examples and applications exist which do not check
		 * our return code.  Furthermore several applications
		 * simply call us to get the systems domainname.  So
		 * rather then immediately fail here we store the
		 * failure, which is returned later, in h_errno.  And
		 * prevent the collection of 'nameserver' information
		 * by setting maxns to 0.  Thus applications that fail
		 * to check our return code wont be able to make
		 * queries anyhow.
		 */
		RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
		maxns = 0;
	}
#ifdef RESOLVSORT
	statp->nsort = 0;
#endif
	res_setservers(statp, u, nserv);

#ifdef	SOLARIS2
	/*
	 * The old libresolv derived the defaultdomain from NIS/NIS+.
	 * We want to keep this behaviour
	 */
	{
		char buf[sizeof(statp->defdname)], *cp;
		int ret;

		if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 &&
			(unsigned int)ret <= sizeof(buf)) {
			if (buf[0] == '+')
				buf[0] = '.';
			cp = strchr(buf, '.');
			cp = (cp == NULL) ? buf : (cp + 1);
			strncpy(statp->defdname, cp,
				sizeof(statp->defdname) - 1);
			statp->defdname[sizeof(statp->defdname) - 1] = '\0';
		}
	}
#endif	/* SOLARIS2 */

	/* 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 (find_directory(B_COMMON_SETTINGS_DIRECTORY, -1, false, path,
			sizeof(path)) == B_OK)
		strlcat(path, "/network/resolv.conf", sizeof(path));

	nserv = 0;
	if ((fp = fopen(path, "r")) != NULL) {
	    /* read the config file */
	    while (fgets(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 addrinfo hints, *ai;
		    char sbuf[NI_MAXSERV];
		    const size_t minsiz =
		        sizeof(statp->_u._ext.ext->nsaddrs[0]);

		    cp = buf + sizeof("nameserver") - 1;
		    while (*cp == ' ' || *cp == '\t')
			cp++;
		    cp[strcspn(cp, ";# \t\n")] = '\0';
		    if ((*cp != '\0') && (*cp != '\n')) {
			memset(&hints, 0, sizeof(hints));
			hints.ai_family = PF_UNSPEC;
			hints.ai_socktype = SOCK_DGRAM;	/*dummy*/
			hints.ai_flags = AI_NUMERICHOST;
			sprintf(sbuf, "%u", NAMESERVER_PORT);
			if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
			    ai->ai_addrlen <= minsiz) {
			    if (statp->_u._ext.ext != NULL) {
				memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
				    ai->ai_addr, ai->ai_addrlen);
			    }
			    if (ai->ai_addrlen <=
			        sizeof(statp->nsaddr_list[nserv])) {
				memcpy(&statp->nsaddr_list[nserv],
				    ai->ai_addr, ai->ai_addrlen);
			    } else
				statp->nsaddr_list[nserv].sin_family = 0;
			    freeaddrinfo(ai);
			    nserv++;
			}
		    }
		    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((unsigned char)*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((unsigned char)*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 > 0) 
		statp->nscount = nserv;
#ifdef RESOLVSORT
	    statp->nsort = nsort;
#endif
	    (void) fclose(fp);
	}
/*
 * Last chance to get a nameserver.  This should not normally
 * be necessary
 */
#ifdef NO_RESOLV_CONF
	if(nserv == 0)
		nserv = get_nameservers(statp);
#endif

	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;

		dots = 0;
		for (cp = statp->defdname; *cp; cp++)
			dots += (*cp == '.');

		cp = statp->defdname;
		while (pp < statp->dnsrch + MAXDFLSRCH) {
			if (dots < LOCALDOMAINPARTS)
				break;
			cp = strchr(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
	}

	if ((cp = getenv("RES_OPTIONS")) != NULL)
		res_setoptions(statp, cp, "env");
	statp->options |= RES_INIT;
	return (statp->res_h_errno);
}
示例#4
0
int
res_vinit_from_file(res_state statp, int preinit, char *resconf_file)
{
	register FILE *fp;
	register char *cp, **pp;
	register int n;
	char buf[BUFSIZ];
	int nserv = 0;    /* number of nameserver records read from file */
	int haveenv = 0;
	int havesearch = 0;
	int isresdefault = 0;
	unsigned short port; /* HOST BYTE ORDER */
	unsigned int i, total_timeout;
#ifdef RESOLVSORT
	int nsort = 0;
	char *net;
#endif
	int dots;

	port = NS_DEFAULTPORT;
	total_timeout = 0;

	if (!preinit)
	{
		statp->retrans = RES_TIMEOUT;
		statp->retry = RES_DFLRETRY;
		statp->options = RES_DEFAULT;
		statp->id = res_randomid();
	}

	if ((statp->options & RES_INIT) != 0) res_ndestroy(statp);

	/* N.B. we allocate a new statp->_u._ext.ext below */

	/* make sure version is set */
	statp->_pad = 9;
	
	statp->nscount = 0;
	
	if ((resconf_file == NULL) || (!strcmp(resconf_file, _PATH_RESCONF)))
	{
		isresdefault = 1;
		
#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(NS_DEFAULTPORT);
#ifdef HAVE_SA_LEN
		statp->nsaddr.sin_len = sizeof(struct sockaddr_in);
#endif
		statp->nscount = 1;

		/*
		 * Force loopback queries to use TCP
		 * so we don't take a timeout if named isn't running.
		 */
		statp->options |= RES_USEVC;
	}
	
	statp->ndots = 1;
	statp->pfcode = 0;
	statp->_vcsock = -1;
	statp->_flags = 0;
	statp->qhook = NULL;
	statp->rhook = NULL;

	statp->_u._ext.nscount = 0;
	statp->_u._ext.ext = (struct __res_state_ext *)calloc(1, sizeof(struct __res_state_ext));
	
	if (statp->_u._ext.ext != NULL)
	{
		memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
		statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
		strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
		strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
		strcpy(statp->_u._ext.ext->bsuffix, "ip6.arpa");
	}
	
#ifdef RESOLVSORT
	statp->nsort = 0;
#endif
	
	/* Allow user to override the local domain definition */
	cp = getenv("LOCALDOMAIN");
	if ((cp != NULL) && (isresdefault != 0))
	{
		(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') break;
			else if (*cp == ' ' || *cp == '\t')
			{
				*cp = 0;
				n = 1;
			}
			else if (n != 0)
			{
				*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 (resconf_file == NULL) resconf_file = _PATH_RESCONF;

	if ((fp = fopen(resconf_file, "r")) != NULL)
	{
		/* look for port number */
		while (fgets(buf, sizeof(buf), fp) != NULL)
		{
			/* skip comments */
			if (*buf == ';' || *buf == '#') continue;

			/* read default domain name */
			if (MATCH(buf, "port"))
			{
				cp = buf + sizeof("port") - 1;
				while (*cp == ' ' || *cp == '\t') cp++;
				if ((*cp == '\0') || (*cp == '\n')) continue;
				port = atoi(cp);
				break;
			}
		}
		fclose(fp);
	}

	if ((fp = fopen(resconf_file, "r")) != NULL)
	{
	    /* read the config file */
	    while (fgets(buf, sizeof(buf), fp) != NULL)
		{
			/* skip comments */
			if ((*buf == ';') || (*buf == '#')) continue;
			
			/* read default domain name */
			if (MATCH(buf, "domain"))
			{
				/* skip if have from environ */
				if (haveenv) 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';
				cp = strpbrk(statp->defdname, " \t\n");
				if (cp != NULL) *cp = '\0';
				havesearch = 0;
				continue;
			}

			/* set search list */
			if (MATCH(buf, "search"))
			{
				/* skip if have from environ */
			    if (haveenv) 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';
				cp = strchr(statp->defdname, '\n');
			    if (cp != 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 != 0)
					{
					    *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))
			{
#ifndef __APPLE__
			    struct addrinfo hints, *ai;
#endif
				int dotcount, semicount, status;
				struct in_addr addr4;
				struct sockaddr_in sin4;
				struct in6_addr addr6;
				struct sockaddr_in6 sin6;
				unsigned short aport; /* HOST BYTE ORDER */
				char *lastdot, *checkp;
			    char sbuf[NI_MAXSERV];
#ifndef __APPLE__
			    const size_t minsiz = sizeof(statp->_u._ext.ext->nsaddrs[0]);
#endif

			    cp = buf + sizeof("nameserver") - 1;
			    while ((*cp == ' ') || (*cp == '\t')) cp++;
			    cp[strcspn(cp, ";# \t\n")] = '\0';
			    if ((*cp != '\0') && (*cp != '\n'))
				{
#ifndef __APPLE__
					memset(&hints, 0, sizeof(hints));
					hints.ai_family = PF_UNSPEC;
					hints.ai_socktype = SOCK_DGRAM;	/*dummy*/
					hints.ai_flags = AI_NUMERICHOST;
#endif
					dotcount = 0;
					semicount = 0;
					lastdot = NULL;
					aport = port;

					for (checkp = cp; *checkp != '\0'; checkp++)
					{
						if (*checkp == ':') semicount++;
						else if (*checkp == '.')
						{
							dotcount++;
							lastdot = checkp;
						}
					}

					if ((dotcount == 4) || ((semicount > 0) && (lastdot != NULL)))
					{
						aport = atoi(lastdot + 1);
						if (aport == 0) aport = port;
						*lastdot = '\0';
					}
					
					sprintf(sbuf, "%u", aport);

#ifdef __APPLE__
					memset(&addr4, 0, sizeof(struct in_addr));
					memset(&sin4, 0, sizeof(struct sockaddr_in));

					memset(&addr6, 0, sizeof(struct in6_addr));
					memset(&sin6, 0, sizeof(struct sockaddr_in6));

					status = inet_pton(AF_INET6, cp, &addr6);
					if (status == 1)
					{
						sin6.sin6_addr = addr6;
						sin6.sin6_family = AF_INET6;
						sin6.sin6_port = htons(aport);
						sin6.sin6_len = sizeof(struct sockaddr_in6);
						if (statp->_u._ext.ext != NULL)
						{
							memcpy(&statp->_u._ext.ext->nsaddrs[nserv], &sin6, sizeof(struct sockaddr_in6));
						}
						statp->nsaddr_list[nserv].sin_family = 0;
						nserv++;
					}
					else
					{
						status = inet_pton(AF_INET, cp, &addr4);
						if (status == 1)
						{
							sin4.sin_addr = addr4;
							sin4.sin_family = AF_INET;
							sin4.sin_port = htons(port);
							sin4.sin_len = sizeof(struct sockaddr_in);
							if (statp->_u._ext.ext != NULL)
							{
								memcpy(&statp->_u._ext.ext->nsaddrs[nserv], &sin4, sizeof(struct sockaddr_in));
							}
							memcpy(&statp->nsaddr_list[nserv], &sin4, sizeof(struct sockaddr_in));
							nserv++;
						}
             	   }

					
#else
					if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && ai->ai_addrlen <= minsiz)
					{
						if (statp->_u._ext.ext != NULL)
						{
							memcpy(&statp->_u._ext.ext->nsaddrs[nserv], ai->ai_addr, ai->ai_addrlen);
						}

						if (ai->ai_addrlen <= sizeof(statp->nsaddr_list[nserv]))
						{
							memcpy(&statp->nsaddr_list[nserv], ai->ai_addr, ai->ai_addrlen);
						}
						else
						{
							statp->nsaddr_list[nserv].sin_family = 0;
						}

						freeaddrinfo(ai);
						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((unsigned char)*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((unsigned char)*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 (MATCH(buf, "timeout"))
			{
				cp = buf + sizeof("timeout") - 1;
				while (*cp == ' ' || *cp == '\t') cp++;
				if ((*cp == '\0') || (*cp == '\n')) continue;
				i = atoi(cp);
				if (i > RES_MAXRETRANS) i = RES_MAXRETRANS;
				total_timeout = i;
				continue;
			}
		}

		if (nserv > 1) statp->nscount = nserv;
#ifdef RESOLVSORT
		statp->nsort = nsort;
#endif
		fclose(fp);
	}

	/*
	 * Last chance to get a nameserver.  This should not normally
	 * be necessary
	 */
#ifdef NO_RESOLV_CONF
	if(nserv == 0) nserv = get_nameservers(statp);
#endif

	if (isresdefault != 0)
	{
		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;

		dots = 0;
		for (cp = statp->defdname; *cp; cp++)
		{
			if (*cp == '.') dots++;
		}

		/* Back up over any trailing dots and cut them out of the name */
		for (cp--; (cp >= statp->defdname) && (*cp == '.'); cp--)
		{
			*cp = '\0';
			dots--;
		}

		cp = statp->defdname;
		while (pp < statp->dnsrch + MAXDFLSRCH)
		{
			if (dots < LOCALDOMAINPARTS) break;

			/* we know there is a dot */
			cp = strchr(cp, '.') + 1;   
			*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
	}

	cp = getenv("RES_OPTIONS");
	if ((cp != NULL) && (isresdefault != 0))
	{
		res_setoptions(statp, cp, "env");
	}

#ifdef __APPLE__
	/*
	 * Post processing to set the timeout value.
	 */
	if (total_timeout != 0)
	{
		/* Timeout was set with a "timeout" line in the file */
		statp->retrans = total_timeout;
	}
	else
	{
		/*
		 * Timeout is default, or was set with "options timeout:"
		 * This is a per-select timeout value.  Calculate total timeout
		 * and set statp->restrans which we (Apple) use to indicate
		 * total time allowed for a query to be resolved.
		 */
		total_timeout = statp->retrans * (statp->retry + 1) * statp->nscount;
		statp->retrans = total_timeout;
	}
#endif

	statp->options |= RES_INIT;
	return (0);
}
示例#5
0
/*
 * Set up default settings.  If the configuration file exist, the values
 * there will have precedence.  Otherwise, the server address is set to
 * INADDR_ANY and the default domain name comes from the gethostname().
 *
 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
 * rather than INADDR_ANY ("0.0.0.0") as the default name server address
 * since it was noted that INADDR_ANY actually meant ``the first interface
 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
 * it had to be "up" in order for you to reach your own name server.  It
 * was later decided that since the recommended practice is to always 
 * install local static routes through 127.0.0.1 for all your network
 * interfaces, that we could solve this problem without a code change.
 *
 * The configuration file should always be used, since it is the only way
 * to specify a default domain.  If you are running a server on your local
 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
 * in the configuration file.
 *
 * Return 0 if completes successfully, -1 on error
 */
int
res_init()
{
	register FILE *fp;
	register char *cp, **pp;
	register int n;
	char buf[MAXDNAME];
	int nserv = 0;    /* number of nameserver records read from file */
	int haveenv = 0;
	int havesearch = 0;
#ifdef RESOLVSORT
	int nsort = 0;
	char *net;
#endif
#ifndef RFC1535
	int dots;
#endif

	/*
	 * These three fields used to be statically initialized.  This made
	 * it hard to use this code in a shared library.  It is necessary,
	 * now that we're doing dynamic initialization here, that we preserve
	 * the old semantics: if an application modifies one of these three
	 * fields of _res before res_init() is called, res_init() will not
	 * alter them.  Of course, if an application is setting them to
	 * _zero_ before calling res_init(), hoping to override what used
	 * to be the static default, we can't detect it and unexpected results
	 * will follow.  Zero for any of these fields would make no sense,
	 * so one can safely assume that the applications were already getting
	 * unexpected results.
	 *
	 * _res.options is tricky since some apps were known to diddle the bits
	 * before res_init() was first called. We can't replicate that semantic
	 * with dynamic initialization (they may have turned bits off that are
	 * set in RES_DEFAULT).  Our solution is to declare such applications
	 * "broken".  They could fool us by setting RES_INIT but none do (yet).
	 */
	if (!_res.retrans)
		_res.retrans = RES_TIMEOUT;
	if (!_res.retry)
		_res.retry = 4;
	if (!(_res.options & RES_INIT))
		_res.options = RES_DEFAULT;

	/*
	 * This one used to initialize implicitly to zero, so unless the app
	 * has set it to something in particular, we can randomize it now.
	 */
	if (!_res.id)
		_res.id = res_randomid();

#ifdef USELOOPBACK
	_res.nsaddr.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
#else
	_res.nsaddr.sin_addr.s_addr = INADDR_ANY;
#endif
	_res.nsaddr.sin_family = AF_INET;
	_res.nsaddr.sin_port = htons(NAMESERVER_PORT);
	_res.nscount = 1;
	_res.ndots = 1;
	_res.pfcode = 0;

	/* Allow user to override the local domain definition */
	if (issetugid() == 0 && (cp = getenv("LOCALDOMAIN")) != NULL) {
		(void)strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
		_res.defdname[sizeof(_res.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 = _res.defdname;
		pp = _res.dnsrch;
		*pp++ = cp;
		for (n = 0; *cp && pp < _res.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) {
	    /* read the config file */
	    while (fgets(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(_res.defdname, cp, sizeof(_res.defdname) - 1);
		    _res.defdname[sizeof(_res.defdname) - 1] = '\0';
		    if ((cp = strpbrk(_res.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(_res.defdname, cp, sizeof(_res.defdname) - 1);
		    _res.defdname[sizeof(_res.defdname) - 1] = '\0';
		    if ((cp = strchr(_res.defdname, '\n')) != NULL)
			    *cp = '\0';
		    /*
		     * Set search list to be blank-separated strings
		     * on rest of line.
		     */
		    cp = _res.defdname;
		    pp = _res.dnsrch;
		    *pp++ = cp;
		    for (n = 0; *cp && pp < _res.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)) {
			_res.nsaddr_list[nserv].sin_addr = a;
			_res.nsaddr_list[nserv].sin_family = AF_INET;
			_res.nsaddr_list[nserv].sin_port =
				htons(NAMESERVER_PORT);
			nserv++;
		    }
		    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)) {
			    _res.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)) {
				    _res.sort_list[nsort].mask = a.s_addr;
				} else {
				    _res.sort_list[nsort].mask = 
					net_mask(_res.sort_list[nsort].addr);
				}
			    } else {
				_res.sort_list[nsort].mask = 
				    net_mask(_res.sort_list[nsort].addr);
			    }
			    nsort++;
			}
			*cp = n;
		    }
		    continue;
		}
#endif
		if (MATCH(buf, "options")) {
		    res_setoptions(buf + sizeof("options") - 1, "conf");
		    continue;
		}
	    }
	    if (nserv > 1) 
		_res.nscount = nserv;
#ifdef RESOLVSORT
	    _res.nsort = nsort;
#endif
	    (void) fclose(fp);
	}
	if (_res.defdname[0] == 0 &&
	    gethostname(buf, sizeof(_res.defdname) - 1) == 0 &&
	    (cp = strchr(buf, '.')) != NULL)
		strcpy(_res.defdname, cp + 1);

	/* find components of local domain that might be searched */
	if (havesearch == 0) {
		pp = _res.dnsrch;
		*pp++ = _res.defdname;
		*pp = NULL;

#ifndef RFC1535
		dots = 0;
		for (cp = _res.defdname; *cp; cp++)
			dots += (*cp == '.');

		cp = _res.defdname;
		while (pp < _res.dnsrch + MAXDFLSRCH) {
			if (dots < LOCALDOMAINPARTS)
				break;
			cp = strchr(cp, '.') + 1;    /* we know there is one */
			*pp++ = cp;
			dots--;
		}
		*pp = NULL;
#ifdef DEBUG
		if (_res.options & RES_DEBUG) {
			printf(";; res_init()... default dnsrch list:\n");
			for (pp = _res.dnsrch; *pp; pp++)
				printf(";;\t%s\n", *pp);
			printf(";;\t..END..\n");
		}
#endif
#endif /* !RFC1535 */
	}

	if (issetugid())
		_res.options |= RES_NOALIASES;
	else if ((cp = getenv("RES_OPTIONS")) != NULL)
		res_setoptions(cp, "env");
	_res.options |= RES_INIT;
	return (0);
}
示例#6
0
/* This function has to be reachable by res_data.c but not publically. */
int
minires_vinit(res_state statp, int preinit) {
	register FILE *fp;
	char *cp;
	register char **pp;
	register int n;
	char buf[BUFSIZ];
	int nserv = 0;    /* number of nameserver records read from file */
	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();
#if defined (TRACING)
		statp->id = trace_mr_res_randomid (statp -> id);
#endif
	}

#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->_sock = -1;
	statp->_flags = 0;
	statp->qhook = NULL;
	statp->rhook = 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, "r")) != NULL) {
	    /* read the config file */
	    while (fgets(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++;
		    }
		    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((int)*cp) && !isspace((int)*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((int)*cp) && !isspace((int)*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 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 = strchr(cp, '.') + 1;    /* we know there is one */
			*pp++ = cp;
			dots--;
		}
		*pp = NULL;
		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 /* !RFC1535 */
	}

	if ((cp = getenv("RES_OPTIONS")) != NULL)
		res_setoptions(statp, cp, "env");
	statp->options |= RES_INIT;
	return (0);
}
示例#7
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;
}