| /* Copyright 1998 by the Massachusetts Institute of Technology. |
| * |
| * Permission to use, copy, modify, and distribute this |
| * software and its documentation for any purpose and without |
| * fee is hereby granted, provided that the above copyright |
| * notice appear in all copies and that both that copyright |
| * notice and this permission notice appear in supporting |
| * documentation, and that the name of M.I.T. not be used in |
| * advertising or publicity pertaining to distribution of the |
| * software without specific, written prior permission. |
| * M.I.T. makes no representations about the suitability of |
| * this software for any purpose. It is provided "as is" |
| * without express or implied warranty. |
| */ |
| |
| #include "setup.h" |
| #include <sys/types.h> |
| |
| #if !defined(WIN32) || defined(WATT32) |
| #include <sys/socket.h> |
| #include <netinet/in.h> |
| #include <arpa/inet.h> |
| #include <netdb.h> |
| #endif |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <ctype.h> |
| |
| #include "ares.h" |
| #include "ares_private.h" |
| #include "inet_net_pton.h" |
| |
| int ares__get_hostent(FILE *fp, int family, struct hostent **host) |
| { |
| char *line = NULL, *p, *q, *canonical, **alias; |
| int status, linesize, end_at_hostname, naliases; |
| struct in_addr addr; |
| struct in6_addr addr6; |
| int addrlen = sizeof(struct in_addr); |
| struct hostent *hostent = NULL; |
| |
| while ((status = ares__read_line(fp, &line, &linesize)) == ARES_SUCCESS) |
| { |
| /* Skip comment lines; terminate line at comment character. */ |
| if (*line == '#' || !*line) |
| continue; |
| p = strchr(line, '#'); |
| if (p) |
| *p = 0; |
| |
| /* Get the address part. */ |
| p = line; |
| while (*p && !isspace((unsigned char)*p)) |
| p++; |
| if (!*p) |
| continue; |
| *p = 0; |
| addr.s_addr = inet_addr(line); |
| if (addr.s_addr == INADDR_NONE) |
| { |
| if (ares_inet_pton(AF_INET6, line, &addr6) > 0) |
| { |
| if (family != AF_INET6) |
| continue; |
| addrlen = sizeof(struct in6_addr); |
| } |
| else |
| continue; |
| } |
| else if (family != AF_INET) |
| continue; |
| |
| /* Get the canonical hostname. */ |
| p++; |
| while (isspace((unsigned char)*p)) |
| p++; |
| if (!*p) |
| continue; |
| q = p; |
| while (*q && !isspace((unsigned char)*q)) |
| q++; |
| end_at_hostname = (*q == 0); |
| *q = 0; |
| canonical = p; |
| |
| naliases = 0; |
| if (!end_at_hostname) |
| { |
| /* Count the aliases. */ |
| p = q + 1; |
| while (isspace((unsigned char)*p)) |
| p++; |
| while (*p) |
| { |
| while (*p && !isspace((unsigned char)*p)) |
| p++; |
| while (isspace((unsigned char)*p)) |
| p++; |
| naliases++; |
| } |
| } |
| |
| /* Allocate memory for the host structure. */ |
| hostent = malloc(sizeof(struct hostent)); |
| if (!hostent) |
| break; |
| hostent->h_aliases = NULL; |
| hostent->h_addr_list = NULL; |
| hostent->h_name = strdup(canonical); |
| if (!hostent->h_name) |
| break; |
| hostent->h_addr_list = malloc(2 * sizeof(char *)); |
| if (!hostent->h_addr_list) |
| break; |
| hostent->h_addr_list[0] = malloc(addrlen); |
| if (!hostent->h_addr_list[0]) |
| break; |
| hostent->h_aliases = malloc((naliases + 1) * sizeof(char *)); |
| if (!hostent->h_aliases) |
| break; |
| |
| /* Copy in aliases. */ |
| naliases = 0; |
| if (!end_at_hostname) |
| { |
| p = canonical + strlen(canonical) + 1; |
| while (isspace((unsigned char)*p)) |
| p++; |
| while (*p) |
| { |
| q = p; |
| while (*q && !isspace((unsigned char)*q)) |
| q++; |
| hostent->h_aliases[naliases] = malloc(q - p + 1); |
| if (hostent->h_aliases[naliases] == NULL) |
| break; |
| memcpy(hostent->h_aliases[naliases], p, q - p); |
| hostent->h_aliases[naliases][q - p] = 0; |
| p = q; |
| while (isspace((unsigned char)*p)) |
| p++; |
| naliases++; |
| } |
| if (*p) |
| break; |
| } |
| hostent->h_aliases[naliases] = NULL; |
| |
| hostent->h_addrtype = family; |
| hostent->h_length = addrlen; |
| if (family == AF_INET) |
| memcpy(hostent->h_addr_list[0], &addr, addrlen); |
| else if (family == AF_INET6) |
| memcpy(hostent->h_addr_list[0], &addr6, addrlen); |
| hostent->h_addr_list[1] = NULL; |
| *host = hostent; |
| free(line); |
| return ARES_SUCCESS; |
| } |
| if(line) |
| free(line); |
| |
| if (status == ARES_SUCCESS) |
| { |
| /* Memory allocation failure; clean up. */ |
| if (hostent) |
| { |
| if(hostent->h_name) |
| free((char *) hostent->h_name); |
| if (hostent->h_aliases) |
| { |
| for (alias = hostent->h_aliases; *alias; alias++) |
| free(*alias); |
| } |
| if(hostent->h_aliases) |
| free(hostent->h_aliases); |
| if (hostent->h_addr_list && hostent->h_addr_list[0]) |
| free(hostent->h_addr_list[0]); |
| if(hostent->h_addr_list) |
| free(hostent->h_addr_list); |
| free(hostent); |
| } |
| return ARES_ENOMEM; |
| } |
| |
| return status; |
| } |