152 lines
4.4 KiB
C
152 lines
4.4 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <netdb.h>
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#include <endian.h>
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#include <stdlib.h>
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#include <string.h>
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#include "resolv_static.h"
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#include "services.h"
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struct servent* getservent_r(struct res_static* rs) {
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const char* p;
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const char* q;
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int namelen;
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int nn,count;
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int total = 0;
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int port;
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char* p2;
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p = rs->servent_ptr;
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if (p == NULL)
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p = _services;
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else if (p[0] == 0)
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return NULL;
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/* first compute the total size */
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namelen = p[0];
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total += namelen + 1;
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q = p + 1 + namelen + 3; /* skip name + port + proto */
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count = q[0]; /* get aliascount */
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q += 1;
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total += (count+1)*sizeof(char*);
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for (nn = 0; nn < count; nn++) {
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int len2 = q[0];
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total += 1 + len2;
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q += 1 + len2;
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}
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/* reallocate the thread-specific servent struct */
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p2 = realloc( (char*)rs->servent.s_aliases, total );
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if (p2 == NULL)
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return NULL;
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/* now write to it */
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rs->servent.s_aliases = (char**) p2;
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p2 += (count+1)*sizeof(char*);
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rs->servent.s_name = p2;
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p2 += namelen + 1;
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rs->servent.s_proto = p2;
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/* copy name + port + setup protocol */
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memcpy( rs->servent.s_name, p+1, namelen );
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rs->servent.s_name[namelen] = 0;
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p += 1 + namelen;
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/* s_port must be in network byte order */
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port = ((((unsigned char*)p)[0] << 8) |
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((unsigned char*)p)[1]);
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rs->servent.s_port = htons(port);
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rs->servent.s_proto = p[2] == 't' ? "tcp" : "udp";
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p += 4; /* skip port(2) + proto(1) + aliascount(1) */
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for (nn = 0; nn < count; nn++) {
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int len2 = p[0];
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rs->servent.s_aliases[nn] = p2;
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memcpy( p2, p+1, len2 );
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p2[len2] = 0;
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p2 += len2 + 1;
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p += len2 + 1;
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}
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rs->servent.s_aliases[nn] = NULL;
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rs->servent_ptr = p;
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return &rs->servent;
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}
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void setservent(int stayopen) {
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endservent();
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}
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void endservent(void) {
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struct res_static* rs = __res_get_static();
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if (rs) rs->servent_ptr = NULL;
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}
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struct servent* getservent(void) {
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struct res_static* rs = __res_get_static();
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return rs ? getservent_r(rs) : NULL;
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}
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struct servent* getservbyname(const char* name, const char* proto) {
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struct res_static* rs = __res_get_static();
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if (rs == NULL) return NULL;
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const char* old_servent_ptr = rs->servent_ptr;
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rs->servent_ptr = NULL;
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struct servent* s;
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while ((s = getservent_r(rs)) != NULL) {
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if (strcmp(s->s_name, name) == 0 && (proto == NULL || strcmp(s->s_proto, proto) == 0)) {
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break;
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}
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}
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rs->servent_ptr = old_servent_ptr;
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return s;
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}
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struct servent* getservbyport(int port, const char* proto) {
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struct res_static* rs = __res_get_static();
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if (rs == NULL) return NULL;
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const char* old_servent_ptr = rs->servent_ptr;
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rs->servent_ptr = NULL;
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struct servent* s;
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while ((s = getservent_r(rs)) != NULL) {
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if (s->s_port == port && (proto == NULL || strcmp(s->s_proto, proto) == 0)) {
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break;
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}
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}
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rs->servent_ptr = old_servent_ptr;
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return s;
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}
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