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1.1 root 1: /* netwrap.c */
2:
3: /* Network related wrapper functions */
4:
1.1.1.2 ! root 5: /* $Id: netwrap.c,v 1.5 2009/08/19 00:16:14 rswindell Exp $ */
1.1 root 6:
7: /****************************************************************************
8: * @format.tab-size 4 (Plain Text/Source Code File Header) *
9: * @format.use-tabs true (see http://www.synchro.net/ptsc_hdr.html) *
10: * *
1.1.1.2 ! root 11: * Copyright 2009 Rob Swindell - http://www.synchro.net/copyright.html *
1.1 root 12: * *
13: * This library is free software; you can redistribute it and/or *
14: * modify it under the terms of the GNU Lesser General Public License *
15: * as published by the Free Software Foundation; either version 2 *
16: * of the License, or (at your option) any later version. *
17: * See the GNU Lesser General Public License for more details: lgpl.txt or *
18: * http://www.fsf.org/copyleft/lesser.html *
19: * *
20: * Anonymous FTP access to the most recent released source is available at *
21: * ftp://vert.synchro.net, ftp://cvs.synchro.net and ftp://ftp.synchro.net *
22: * *
23: * Anonymous CVS access to the development source and modification history *
24: * is available at cvs.synchro.net:/cvsroot/sbbs, example: *
25: * cvs -d :pserver:[email protected]:/cvsroot/sbbs login *
26: * (just hit return, no password is necessary) *
27: * cvs -d :pserver:[email protected]:/cvsroot/sbbs checkout src *
28: * *
29: * For Synchronet coding style and modification guidelines, see *
30: * http://www.synchro.net/source.html *
31: * *
32: * You are encouraged to submit any modifications (preferably in Unix diff *
33: * format) via e-mail to [email protected] *
34: * *
35: * Note: If this box doesn't appear square, then you need to fix your tabs. *
36: ****************************************************************************/
37:
38: #include "genwrap.h" /* truncsp */
39: #include "netwrap.h" /* verify prototypes */
1.1.1.2 ! root 40: #include "sockwrap.h"
1.1 root 41:
42: #include <stdlib.h> /* malloc() */
1.1.1.2 ! root 43: #include <ctype.h> /* isspace() */
1.1 root 44:
45: #if defined(_WIN32)
46: #include <iphlpapi.h> /* GetNetworkParams */
47: #endif
48:
49: str_list_t getNameServerList(void)
50: {
51: #ifdef __unix__ /* Look up DNS server address */
52: FILE* fp;
53: char* p;
54: char str[128];
55: str_list_t list;
56:
57: if((list=strListInit())==NULL)
58: return(NULL);
59: if((fp=fopen("/etc/resolv.conf","r"))!=NULL) {
60: while(!feof(fp)) {
61: if(fgets(str,sizeof(str),fp)==NULL)
62: break;
63: truncsp(str);
64: p=str;
65: SKIP_WHITESPACE(p);
66: if(strnicmp(p,"nameserver",10)!=0) /* no match */
67: continue;
68: FIND_WHITESPACE(p); /* skip "nameserver" */
69: SKIP_WHITESPACE(p); /* skip more white-space */
70: strListPush(&list,p);
71: }
72: fclose(fp);
73: }
74: return(list);
75:
76: #elif defined(_WIN32)
77: FIXED_INFO* FixedInfo=NULL;
78: ULONG FixedInfoLen=0;
79: IP_ADDR_STRING* ip;
80: str_list_t list;
81:
82: if((list=strListInit())==NULL)
83: return(NULL);
84: if(GetNetworkParams(FixedInfo,&FixedInfoLen) == ERROR_BUFFER_OVERFLOW) {
85: FixedInfo=(FIXED_INFO*)malloc(FixedInfoLen);
86: if(GetNetworkParams(FixedInfo,&FixedInfoLen) == ERROR_SUCCESS) {
87: ip=&FixedInfo->DnsServerList;
88: for(; ip!=NULL; ip=ip->Next)
89: strListPush(&list,ip->IpAddress.String);
90: }
91: if(FixedInfo!=NULL)
92: free(FixedInfo);
93: }
94: return(list);
95: #else
96: #error "Need a get_nameserver() implementation for this platform"
97: #endif
98: }
99:
1.1.1.2 ! root 100: const char* getHostNameByAddr(const char* str)
! 101: {
! 102: HOSTENT* h;
! 103: uint32_t ip;
! 104:
! 105: #ifdef _WIN32
! 106: WSADATA wsaData;
! 107: WSAStartup(MAKEWORD(2, 2), &wsaData);
! 108: #endif
! 109: if(str==NULL)
! 110: return NULL;
! 111: if((ip=inet_addr(str)) == INADDR_NONE)
! 112: return str;
! 113: if((h=gethostbyaddr((char *)&ip,sizeof(ip),AF_INET))==NULL)
! 114: return NULL;
! 115:
! 116: #ifdef _WIN32
! 117: WSACleanup();
! 118: #endif
! 119:
! 120: return h->h_name;
! 121: }
! 122:
1.1 root 123: /* In case we want to DLL-export getNameServerList in the future */
124: void freeNameServerList(str_list_t list)
125: {
126: strListFree(&list);
127: }
128:
129: #if NETWRAP_TEST
1.1.1.2 ! root 130: int main(int argc, char** argv)
1.1 root 131: {
132: size_t i;
133: str_list_t list;
134:
135: if((list=getNameServerList())!=NULL) {
136: for(i=0;list[i]!=NULL;i++)
137: printf("%s\n",list[i]);
138: freeNameServerList(list);
139: }
140:
1.1.1.2 ! root 141: if(argc>1)
! 142: printf("%s\n", getHostNameByAddr(argv[1]));
1.1 root 143: return 0;
144: }
145: #endif
146:
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