179 lines
3.9 KiB
C
179 lines
3.9 KiB
C
/****************************************************************************
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* This file is part of the project AqHome.
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* AqHome (c) by 2025 Martin Preuss, all rights reserved.
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*
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* The license for this file can be found in the file COPYING which you
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* should have received along with this file.
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****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "./tcp_object.h"
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#include <gwenhywfar/debug.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <errno.h>
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#include <string.h>
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/* ------------------------------------------------------------------------------------------------
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* forward declarations
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* ------------------------------------------------------------------------------------------------
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*/
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static int _socketSetBlocking(int sk, int fl);
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static int _translateHError(int herr);
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static int _setHostAddr(struct in_addr *inetAddr, const char *sAddr);
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static int _setHostName(struct in_addr *inetAddr, const char *sAddr);
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/* ------------------------------------------------------------------------------------------------
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* implementations
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* ------------------------------------------------------------------------------------------------
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*/
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int AQH_TcpObject_CreateConnectedSocket(const char *addr, int port)
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{
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int sk;
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struct sockaddr_in inetAddr;
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int rv;
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memset(&inetAddr, 0, sizeof(inetAddr));
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inetAddr.sin_family=AF_INET;
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rv=_setHostAddr(&inetAddr.sin_addr, addr); /* try tuple */
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if (rv<0) {
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rv=_setHostName(&inetAddr.sin_addr, addr); /* lookup name */
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if (rv<0) {
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DBG_INFO(AQH_LOGDOMAIN, "here (%d)", rv);
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return rv;
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}
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}
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inetAddr.sin_port=htons(port);
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sk=socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
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if (sk<0) {
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DBG_INFO(AQH_LOGDOMAIN, "socket(): %s", strerror(errno));
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return GWEN_ERROR_IO;
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}
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rv=connect(sk, (struct sockaddr*) &inetAddr, sizeof(inetAddr));
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if (rv<0) {
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DBG_INFO(AQH_LOGDOMAIN, "here (%d)", rv);
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close(sk);
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return rv;
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}
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rv=_socketSetBlocking(sk, 0);
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if (rv<0) {
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DBG_INFO(AQH_LOGDOMAIN, "here (%d)", rv);
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close(sk);
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return rv;
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}
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return sk;
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}
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int _setHostAddr(struct in_addr *inetAddr, const char *sAddr)
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{
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inetAddr->s_addr=0;
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if (!inet_aton(sAddr, inetAddr)) {
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DBG_ERROR(AQH_LOGDOMAIN, "Invalid address \"%s\"", sAddr);
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return GWEN_ERROR_INVALID;
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}
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return 0;
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}
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int _setHostName(struct in_addr *inetAddr, const char *sAddr)
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{
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struct hostent *he;
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he=gethostbyname(sAddr);
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if (!he) {
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DBG_ERROR(AQH_LOGDOMAIN, "gethostbyname(\"%s\"): %s", sAddr, hstrerror(h_errno));
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return _translateHError(h_errno);
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}
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/* name resolved, store address */
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memcpy(inetAddr, he->h_addr_list[0], sizeof(struct in_addr));
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return 0;
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}
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int _socketSetBlocking(int sk, int fl)
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{
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int prevFlags;
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int newFlags;
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/* get current socket flags */
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prevFlags=fcntl(sk, F_GETFL);
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if (prevFlags==-1) {
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DBG_INFO(AQH_LOGDOMAIN, "fcntl(): %s", strerror(errno));
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return GWEN_ERROR_IO;
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}
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/* set nonblocking/blocking */
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if (fl)
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newFlags=prevFlags&(~O_NONBLOCK);
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else
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newFlags=prevFlags|O_NONBLOCK;
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if (-1==fcntl(sk, F_SETFL, newFlags)) {
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DBG_INFO(AQH_LOGDOMAIN, "fcntl(): %s", strerror(errno));
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return GWEN_ERROR_IO;
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}
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prevFlags=fcntl(sk, F_GETFL);
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if (prevFlags!=newFlags) {
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DBG_ERROR(AQH_LOGDOMAIN, "fcntl() did not set flags correctly (%08x!=%08x)", prevFlags, newFlags);
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return GWEN_ERROR_IO;
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}
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return 0;
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}
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int _translateHError(int herr)
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{
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int rv;
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switch (herr) {
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case HOST_NOT_FOUND:
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rv=GWEN_ERROR_HOST_NOT_FOUND;
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break;
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#ifdef NO_ADDRESS
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case NO_ADDRESS:
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rv=GWEN_ERROR_NO_ADDRESS;
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break;
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#endif
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case NO_RECOVERY:
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rv=GWEN_ERROR_NO_RECOVERY;
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break;
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case TRY_AGAIN:
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rv=GWEN_ERROR_TRY_AGAIN;
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break;
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default:
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rv=GWEN_ERROR_UNKNOWN_DNS_ERROR;
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break;
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} /* switch */
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return rv;
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}
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