1  #ifndef HAVE_SOCKETS
       2  #error getaddrinfo.c included by mistake! no socket support!
       3  #else
       4  #include <sys/types.h>
       5  #include <sys/socket.h>
       6  #ifdef HAVE_NETDB_H
       7  #include <netdb.h>
       8  #endif
       9  #ifdef HAVE_NETINET_IN_H
      10  #include <netinet/in.h>
      11  #endif
      12  #ifdef HAVE_ARPA_INET_H
      13  #include <arpa/inet.h>
      14  #endif
      15  #include <errno.h>
      16  #include <string.h>	/* strerror */
      17  
      18  #include "getaddrinfo.h"
      19  
      20  void
      21  freeaddrinfo(struct addrinfo *res)
      22  {
      23  	if (res->ai_addr != NULL)
      24  		free(res->ai_addr);
      25  	free(res);
      26  }
      27  
      28  int
      29  getaddrinfo(const char *hostname, const char *portname,
      30  	struct addrinfo *hints, struct addrinfo **res)
      31  {
      32  	struct addrinfo *out;
      33  	if (res == NULL)
      34  		return EINVAL;
      35  
      36  	out = (struct addrinfo *) calloc(1, sizeof(*out));
      37  	if (out == NULL) {
      38  		*res = NULL;
      39  		return ENOMEM;
      40  	}
      41  
      42  	out->ai_addr = (struct sockaddr *) malloc(sizeof(struct sockaddr_in));
      43  	if (out->ai_addr == NULL) {
      44  		free(out);
      45  		*res = NULL;
      46  		return ENOMEM;
      47  	}
      48  
      49  	out->ai_socktype = SOCK_STREAM;
      50  	if (hints != NULL) {
      51  		if (hints->ai_socktype)
      52  			out->ai_socktype = hints->ai_socktype;
      53  		if (hints->ai_protocol)
      54  			out->ai_protocol = hints->ai_protocol;
      55  	}
      56  
      57  	if (out->ai_protocol == 0) {
      58  		switch (out->ai_socktype) {
      59  		case SOCK_STREAM:
      60  			out->ai_protocol = IPPROTO_TCP;
      61  			break;
      62  		case SOCK_DGRAM:
      63  			out->ai_protocol = IPPROTO_UDP;
      64  			break;
      65  		case SOCK_RAW:
      66  			out->ai_protocol = IPPROTO_RAW;
      67  			break;
      68  		}
      69  	}
      70  
      71  	out->ai_addrlen = sizeof(struct sockaddr_in);
      72  	memset(out->ai_addr, '\0', sizeof(struct sockaddr_in));
      73  
      74  	if (hostname != NULL) {
      75  		struct hostent *he;
      76  		he = gethostbyname(hostname);
      77  		if (he != NULL && he->h_addr_list != NULL) {
      78  			((struct sockaddr_in *)out->ai_addr)->sin_addr.s_addr
      79  				= ((struct in_addr *)he->h_addr_list[0])->s_addr;
      80  		} else {
      81  			freeaddrinfo(out);
      82  			return EADDRNOTAVAIL;
      83  		}
      84  	} else {
      85  		if (!(out->ai_flags & AI_PASSIVE))
      86  			((struct sockaddr_in *)out->ai_addr)->sin_addr.s_addr
      87  							= htonl(INADDR_ANY);
      88  	}
      89  	((struct sockaddr_in *)out->ai_addr)->sin_family = AF_INET;
      90  	out->ai_family = AF_INET;
      91  
      92  	if (portname != NULL && *portname) {
      93  		long portnum;
      94  		char *end;
      95  		portnum = strtol(portname, &end, 10);
      96  		if (*end == '\0' && portnum > 0 && portnum < 65536) {
      97  			((struct sockaddr_in *)out->ai_addr)->sin_port
      98  							= htons(portnum);
      99  		} else {
     100  			struct servent *se;
     101  			se = getservbyname(portname, NULL);
     102  			if (se != NULL) {
     103  				((struct sockaddr_in *)out->ai_addr)->sin_port
     104  							= se->s_port;
     105  			}
     106  		}
     107  	}
     108  
     109  	*res = out;
     110  
     111  	return 0;
     112  }
     113  
     114  const char *
     115  gai_strerror(int errcode)
     116  {
     117  	return strerror(errcode);
     118  }
     119  #endif