diff options
Diffstat (limited to 'gethostbyname.c')
| -rw-r--r-- | gethostbyname.c | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/gethostbyname.c b/gethostbyname.c new file mode 100644 index 0000000..d151606 --- /dev/null +++ b/gethostbyname.c @@ -0,0 +1,228 @@ +/* + * This file is a ghastly hack because nobody can agree on + * gethostbyname_r()'s prototype. + * + * Copyright (C) 2001,2002 Brian Stafford <brian@stafford.uklinux.net> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#define _SVID_SOURCE 1 /* Need this to get gethostbyname_r() */ + +#include <assert.h> + +#include <stdlib.h> +#include <string.h> +#include <netdb.h> +#include <errno.h> + +#include "gethostbyname.h" + +#if HAVE_GETIPNODEBYNAME + +void +free_ghbnctx (struct ghbnctx *ctx) +{ + assert (ctx != NULL); + + if (ctx->hostent != NULL) + freehostent (ctx->hostent); +} + +struct hostent * +gethostbyname_ctx (const char *host, struct ghbnctx *ctx) +{ + assert (ctx != NULL); + + memset (ctx, 0, sizeof (struct ghbnctx)); + ctx->hostent = getipnodebyname (host, AF_UNSPEC, AI_ADDRCONFIG, &ctx->h_err); + return ctx->hostent; +} + +int +h_error_ctx (struct ghbnctx *ctx) +{ + assert (ctx != NULL); + + return ctx->h_err; +} + +#elif HAVE_GETHOSTBYNAME_R == 6 + +void +free_ghbnctx (struct ghbnctx *ctx) +{ + assert (ctx != NULL); + + if (ctx->hostbuf != NULL) + free (ctx->hostbuf); +} + +struct hostent * +gethostbyname_ctx (const char *host, struct ghbnctx *ctx) +{ + struct hostent *hp; + char *tmp; + int err; + + assert (ctx != NULL); + + memset (ctx, 0, sizeof (struct ghbnctx)); + ctx->hostbuf_len = 2048; + if ((ctx->hostbuf = malloc (ctx->hostbuf_len)) == NULL) + { + errno = ENOMEM; + return NULL; + } + while ((err = gethostbyname_r (host, + &ctx->hostent, ctx->hostbuf, ctx->hostbuf_len, + &hp, &ctx->h_err)) == ERANGE) + { + ctx->hostbuf_len += 1024; + if ((tmp = realloc (ctx->hostbuf, ctx->hostbuf_len)) == NULL) + { + errno = ENOMEM; + return NULL; + } + ctx->hostbuf = tmp; + } + if (err != 0) + { + errno = err; + return NULL; + } + return hp; +} + +int +h_error_ctx (struct ghbnctx *ctx) +{ + assert (ctx != NULL); + + return ctx->h_err; +} + +#elif HAVE_GETHOSTBYNAME_R == 5 + +void +free_ghbnctx (struct ghbnctx *ctx) +{ + assert (ctx != NULL); + + if (ctx->hostbuf != NULL) + free (ctx->hostbuf); +} + +struct hostent * +gethostbyname_ctx (const char *host, struct ghbnctx *ctx) +{ + struct hostent *hp; + char *tmp; + + assert (ctx != NULL); + + memset (ctx, 0, sizeof (struct ghbnctx)); + ctx->hostbuf_len = 2048; + if ((ctx->hostbuf = malloc (ctx->hostbuf_len)) == NULL) + { + errno = ENOMEM; + return NULL; + } + while ((hp = gethostbyname_r (host, &ctx->hostent, + ctx->hostbuf, ctx->hostbuf_len, + &ctx->h_err)) == NULL && errno == ERANGE) + { + ctx->hostbuf_len += 1024; + if ((tmp = realloc (ctx->hostbuf, ctx->hostbuf_len)) == NULL) + { + errno = ENOMEM; + return NULL; + } + ctx->hostbuf = tmp; + } + return hp; +} + +int +h_error_ctx (struct ghbnctx *ctx) +{ + assert (ctx != NULL); + + return ctx->h_err; +} + +#elif HAVE_GETHOSTBYNAME_R == 3 + +void +free_ghbnctx (struct ghbnctx *ctx) +{ + assert (ctx != NULL); + + /* FIXME: does this need to do anything? */ +} + +struct hostent * +gethostbyname_ctx (const char *host, struct ghbnctx *ctx) +{ + assert (ctx != NULL); + + if (!gethostbyname_r (host, &ctx->hostent, &ctx->hostent_data)) + { + ctx->h_err = h_errno; /* FIXME: is this correct? */ + return NULL; + } + return &ctx->hostent; +} + +int +h_error_ctx (struct ghbnctx *ctx) +{ + assert (ctx != NULL); + + return ctx->h_err; +} + +#else + +void +free_ghbnctx (struct ghbnctx *ctx __attribute__ ((unused))) +{ + assert (ctx != NULL); +} + +struct hostent * +gethostbyname_ctx (const char *host, struct ghbnctx *ctx) +{ + struct hostent *hp; + + hp = gethostbyname (host); + if (hp == NULL) + ctx->h_err = h_errno; + return hp; +} + +int +h_error_ctx (struct ghbnctx *ctx) +{ + assert (ctx != NULL); + + return ctx->h_err; +} + +#endif |