diff options
Diffstat (limited to 'e-util/e-host-utils.c')
| -rw-r--r-- | e-util/e-host-utils.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/e-util/e-host-utils.c b/e-util/e-host-utils.c new file mode 100644 index 0000000000..9dfbcc1f59 --- /dev/null +++ b/e-util/e-host-utils.c @@ -0,0 +1,139 @@ +/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */ +/* e-host-utils.c + * + * Copyright (C) 2001 Helix Code, Inc. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of the + * License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + * + * Author: Chris Toshok + */ + +#include <config.h> +#include "e-msgport.h" +#include "e-host-utils.h" +#include <string.h> +#include <stdlib.h> +#include <stdio.h> +#include <errno.h> + +#ifndef HAVE_GETHOSTBYNAME_R +static EMutex *gethost_mutex = NULL; +#endif + +void +e_gethostbyname_init () +{ +#ifndef HAVE_GETHOSTBYNAME_R + if (gethost_mutex) + return; + + gethost_mutex = e_mutex_new (E_MUTEX_SIMPLE); +#endif +} + +int +e_gethostbyname_r (const char *name, struct hostent *host, + char *buf, int buflen, int *herr) +{ +#ifdef HAVE_GETHOSTBYNAME_R +#ifdef GETHOSTBYNAME_R_FIVE_ARGS + return gethostbyname_r(name, host, buf, buflen, herr); +#else + struct hostent *hp; + return gethostbyname_r(name, host, buf, buflen, &hp, herr); +#endif +#else + int i; + char *p; + struct hostent *h; + int req_length; + int num_aliases = 0, num_addrs = 0; + + if (!gethost_mutex) { + g_warning ("mutex wasn't initialized - you must call e_gethostbyname_init before e_gethostbyname_r\n"); + return -1; + } + + e_mutex_lock (gethost_mutex); + + h = gethostbyname (name); + + if (!h) { + e_mutex_unlock (gethost_mutex); + return -1; + } + + /* check to make sure we have enough room in our buffer */ + req_length = 0; + if (h->h_aliases) { + for (i = 0; h->h_aliases[i]; i ++) + req_length += strlen (h->h_aliases[i]) + 1; + num_aliases = i + 1; + } + if (h->h_addr_list) { + for (i = 0; h->h_addr_list[i]; i ++) + req_length += h->h_length; + num_addrs = i + 1; + } + + if (buflen < req_length) { + *herr = ERANGE; + e_mutex_unlock (gethost_mutex); + return -1; + } + + if (num_aliases) + host->h_aliases = malloc (sizeof (char*) * num_aliases); + else + host->h_aliases = NULL; + if (num_addrs) + host->h_addr_list = malloc (sizeof (char*) * num_addrs); + else + host->h_addr_list = NULL; + + host->h_name = strdup (h->h_name); + host->h_addrtype = h->h_addrtype; + host->h_length = h->h_length; + + /* copy the aliases/addresses into the buffer, and assign the + pointers into the hostent */ + *buf = 0; + p = buf; + if (num_aliases) { + for (i = 0; h->h_aliases[i]; i ++) { + strcpy (buf, h->h_aliases[i]); + host->h_aliases[i] = p; + p += strlen (h->h_aliases[i]); + } + host->h_aliases[num_aliases - 1] = NULL; + } + + if (num_addrs) { + for (i = 0; h->h_addr_list[i]; i ++) { + memcpy (buf, h->h_addr_list[i], h->h_length); + host->h_addr_list[i] = p; + p += h->h_length; + } + host->h_addr_list[num_addrs - 1] = NULL; + } + + *herr = h_errno; + + e_mutex_unlock (gethost_mutex); + + return 0; +#endif +} |