"Fossies" - the Fresh Open Source Software Archive

Member "scanssh-2.1/getaddrinfo.c" (31 Mar 2004, 2286 Bytes) of package /linux/privat/old/scanssh-2.1.tar.gz:

    1 /*
    2  * fake library for ssh
    3  *
    4  * This file includes getaddrinfo(), freeaddrinfo() and gai_strerror().
    5  * These funtions are defined in rfc2133.
    6  *
    7  * But these functions are not implemented correctly. The minimum subset
    8  * is implemented for ssh use only. For exapmle, this routine assumes
    9  * that ai_family is AF_INET. Don't use it for another purpose.
   10  */
   11 
   12 #include <sys/types.h>
   13 #include <sys/socket.h>
   14 #include <netdb.h>
   15 
   16 #include "config.h"
   17 
   18 void freeaddrinfo(struct addrinfo *ai)
   19 {
   20     struct addrinfo *next;
   21 
   22     do {
   23         next = ai->ai_next;
   24         free(ai);
   25     } while (NULL != (ai = next));
   26 }
   27 
   28 static struct addrinfo *malloc_ai(int port, u_long addr)
   29 {
   30     struct addrinfo *ai;
   31 
   32     ai = malloc(sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
   33     if (ai == NULL)
   34         return(NULL);
   35     
   36     memset(ai, 0, sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
   37     
   38     ai->ai_addr = (struct sockaddr *)(ai + 1);
   39     /* XXX -- ssh doesn't use sa_len */
   40     ai->ai_addrlen = sizeof(struct sockaddr_in);
   41     ai->ai_addr->sa_family = ai->ai_family = AF_INET;
   42 
   43     ((struct sockaddr_in *)(ai)->ai_addr)->sin_port = port;
   44     ((struct sockaddr_in *)(ai)->ai_addr)->sin_addr.s_addr = addr;
   45     
   46     return(ai);
   47 }
   48 
   49 int getaddrinfo(const char *hostname, const char *servname, 
   50                 const struct addrinfo *hints, struct addrinfo **res)
   51 {
   52     struct addrinfo *cur, *prev = NULL;
   53     struct hostent *hp;
   54     struct in_addr in;
   55     int i, port;
   56 
   57     if (servname)
   58         port = htons(atoi(servname));
   59     else
   60         port = 0;
   61 
   62     if (hints && hints->ai_flags & AI_PASSIVE) {
   63         if (NULL != (*res = malloc_ai(port, htonl(0x00000000))))
   64             return 0;
   65         else
   66             return EAI_MEMORY;
   67     }
   68         
   69     if (!hostname) {
   70         if (NULL != (*res = malloc_ai(port, htonl(0x7f000001))))
   71             return 0;
   72         else
   73             return EAI_MEMORY;
   74     }
   75     
   76     if (inet_aton(hostname, &in)) {
   77         if (NULL != (*res = malloc_ai(port, in.s_addr)))
   78             return 0;
   79         else
   80             return EAI_MEMORY;
   81     }
   82     
   83     hp = gethostbyname(hostname);
   84     if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) {
   85         for (i = 0; hp->h_addr_list[i]; i++) {
   86             cur = malloc_ai(port, ((struct in_addr *)hp->h_addr_list[i])->s_addr);
   87             if (cur == NULL) {
   88                 if (*res)
   89                     freeaddrinfo(*res);
   90                 return EAI_MEMORY;
   91             }
   92             
   93             if (prev)
   94                 prev->ai_next = cur;
   95             else
   96                 *res = cur;
   97 
   98             prev = cur;
   99         }
  100         return 0;
  101     }
  102     
  103     return EAI_NODATA;
  104 }