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4bd78a7df4
curl/lib/hostip.c
Daniel Stenberg 4e276b1b68 pack_hostent() now aligns the data properly on 64bit boundaries to work on 
more CPU architectures
2001-10-23 12:11:43 +00:00

373 lines
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C
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/*****************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 2001, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* In order to be useful for every potential user, curl and libcurl are
* dual-licensed under the MPL and the MIT/X-derivate licenses.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the MPL or the MIT/X-derivate
* licenses. You may pick one of these licenses.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* $Id$
*****************************************************************************/
#include "setup.h"
#include <string.h>
#include <errno.h>
#define _REENTRANT
#if defined(WIN32) && !defined(__GNUC__) || defined(__MINGW32__)
#include <winsock.h>
#else
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef VMS
#include <inet.h>
#include <stdlib.h>
#endif
#endif
#include "urldata.h"
#include "sendf.h"
#include "hostip.h"
#if defined(HAVE_INET_NTOA_R) && !defined(HAVE_INET_NTOA_R_DECL)
#include "inet_ntoa_r.h"
#endif
/* The last #include file should be: */
#ifdef MALLOCDEBUG
#include "memdebug.h"
#endif
/*
* This is a wrapper function for freeing name information in a protocol
* independent way. This takes care of using the appropriate underlaying
* proper function.
*/
void Curl_freeaddrinfo(void *freethis)
{
#ifdef ENABLE_IPV6
freeaddrinfo(freethis);
#else
free(freethis);
#endif
}
/* --- resolve name or IP-number --- */
#ifdef ENABLE_IPV6
#ifdef MALLOCDEBUG
/* These two are strictly for memory tracing and are using the same
* style as the family otherwise present in memdebug.c. I put these ones
* here since they require a bunch of struct types I didn't wanna include
* in memdebug.c
*/
int curl_getaddrinfo(char *hostname, char *service,
struct addrinfo *hints,
struct addrinfo **result,
int line, const char *source)
{
int res=(getaddrinfo)(hostname, service, hints, result);
if(0 == res) {
/* success */
if(logfile)
fprintf(logfile, "ADDR %s:%d getaddrinfo() = %p\n",
source, line, *result);
}
else {
if(logfile)
fprintf(logfile, "ADDR %s:%d getaddrinfo() failed\n",
source, line);
}
return res;
}
void curl_freeaddrinfo(struct addrinfo *freethis,
int line, const char *source)
{
(freeaddrinfo)(freethis);
if(logfile)
fprintf(logfile, "ADDR %s:%d freeaddrinfo(%p)\n",
source, line, freethis);
}
#endif
/*
* Return name information about the given hostname and port number. If
* successful, the 'addrinfo' is returned and the forth argument will point to
* memory we need to free after use. That meory *MUST* be freed with
* Curl_freeaddrinfo(), nothing else.
*/
Curl_addrinfo *Curl_getaddrinfo(struct SessionHandle *data,
char *hostname,
int port,
char **bufp)
{
struct addrinfo hints, *res;
int error;
char sbuf[NI_MAXSERV];
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_CANONNAME;
snprintf(sbuf, sizeof(sbuf), "%d", port);
error = getaddrinfo(hostname, sbuf, &hints, &res);
if (error) {
infof(data, "getaddrinfo(3) failed for %s\n", hostname);
return NULL;
}
*bufp=(char *)res; /* make it point to the result struct */
return res;
}
#else /* following code is IPv4-only */
#ifndef HAVE_GETHOSTBYNAME_R
/**
* Performs a "deep" copy of a hostent into a buffer (returns a pointer to the
* copy). Make absolutely sure the destination buffer is big enough!
*
* Keith McGuigan
* 10/3/2001 */
static struct hostent* pack_hostent(char* buf, struct hostent* orig)
{
char* bufptr;
struct hostent* copy;
int i;
char* str;
int len;
bufptr = buf;
copy = (struct hostent*)bufptr;
bufptr += sizeof(struct hostent);
copy->h_name = bufptr;
len = strlen(orig->h_name) + 1;
strncpy(bufptr, orig->h_name, len);
bufptr += len;
/* we align on even 64bit boundaries for safety */
#define MEMALIGN(x) (((unsigned long)(x)&0xfffffff8)+8)
/* This must be aligned properly to work on many CPU architectures! */
copy->h_aliases = (char**)MEMALIGN(bufptr);
/* Figure out how many aliases there are */
for (i = 0; orig->h_aliases[i] != NULL; ++i);
/* Reserve room for the array */
bufptr += (i + 1) * sizeof(char*);
/* Clone all known aliases */
for(i = 0; (str = orig->h_aliases[i]); i++) {
len = strlen(str) + 1;
strncpy(bufptr, str, len);
copy->h_aliases[i] = bufptr;
bufptr += len;
}
/* Terminate the alias list with a NULL */
copy->h_aliases[i] = NULL;
copy->h_addrtype = orig->h_addrtype;
copy->h_length = orig->h_length;
/* align it for (at least) 32bit accesses */
bufptr = (char *)MEMALIGN(bufptr);
copy->h_addr_list = (char**)bufptr;
/* Figure out how many addresses there are */
for (i = 0; orig->h_addr_list[i] != NULL; ++i);
/* Reserve room for the array */
bufptr += (i + 1) * sizeof(char*);
i = 0;
len = orig->h_length;
str = orig->h_addr_list[i];
while (str != NULL) {
memcpy(bufptr, str, len);
copy->h_addr_list[i] = bufptr;
bufptr += len;
str = orig->h_addr_list[++i];
}
copy->h_addr_list[i] = NULL;
return copy;
}
#endif
static char *MakeIP(unsigned long num,char *addr, int addr_len)
{
#if defined(HAVE_INET_NTOA) || defined(HAVE_INET_NTOA_R)
struct in_addr in;
in.s_addr = htonl(num);
#if defined(HAVE_INET_NTOA_R)
inet_ntoa_r(in,addr,addr_len);
#else
strncpy(addr,inet_ntoa(in),addr_len);
#endif
#else
unsigned char *paddr;
num = htonl(num); /* htonl() added to avoid endian probs */
paddr = (unsigned char *)&num;
sprintf(addr, "%u.%u.%u.%u", paddr[0], paddr[1], paddr[2], paddr[3]);
#endif
return (addr);
}
/* The original code to this function was once stolen from the Dancer source
code, written by Bjorn Reese, it has since been patched and modified
considerably. */
#ifndef INADDR_NONE
#define INADDR_NONE (unsigned long) ~0
#endif
Curl_addrinfo *Curl_getaddrinfo(struct SessionHandle *data,
char *hostname,
int port,
char **bufp)
{
struct hostent *h = NULL;
unsigned long in;
int ret; /* this variable is unused on several platforms but used on some */
#define CURL_NAMELOOKUP_SIZE 9000
/* Allocate enough memory to hold the full name information structs and
* everything. OSF1 is known to require at least 8872 bytes. The buffer
* required for storing all possible aliases and IP numbers is according to
* Stevens' Unix Network Programming 2nd editor, p. 304: 8192 bytes! */
char *buf = (char *)malloc(CURL_NAMELOOKUP_SIZE);
if(!buf)
return NULL; /* major failure */
*bufp = buf;
port=0; /* unused in IPv4 code */
ret = 0; /* to prevent the compiler warning */
if ( (in=inet_addr(hostname)) != INADDR_NONE ) {
struct in_addr *addrentry;
h = (struct hostent*)buf;
h->h_addr_list = (char**)(buf + sizeof(*h));
addrentry = (struct in_addr*)(h->h_addr_list + 2);
addrentry->s_addr = in;
h->h_addr_list[0] = (char*)addrentry;
h->h_addr_list[1] = NULL;
h->h_addrtype = AF_INET;
h->h_length = sizeof(*addrentry);
h->h_name = *(h->h_addr_list) + h->h_length;
/* bad one h->h_name = (char*)(h->h_addr_list + h->h_length); */
MakeIP(ntohl(in),h->h_name, CURL_NAMELOOKUP_SIZE - (long)(h->h_name) + (long)buf);
}
#if defined(HAVE_GETHOSTBYNAME_R)
else {
int h_errnop;
/* Workaround for gethostbyname_r bug in qnx nto. It is also _required_
for some of these functions. */
memset(buf, 0, CURL_NAMELOOKUP_SIZE);
#ifdef HAVE_GETHOSTBYNAME_R_5
/* Solaris, IRIX and more */
if ((h = gethostbyname_r(hostname,
(struct hostent *)buf,
buf + sizeof(struct hostent),
CURL_NAMELOOKUP_SIZE - sizeof(struct hostent),
&h_errnop)) == NULL )
#endif
#ifdef HAVE_GETHOSTBYNAME_R_6
/* Linux */
if( gethostbyname_r(hostname,
(struct hostent *)buf,
buf + sizeof(struct hostent),
CURL_NAMELOOKUP_SIZE - sizeof(struct hostent),
&h, /* DIFFERENCE */
&h_errnop))
#endif
#ifdef HAVE_GETHOSTBYNAME_R_3
/* AIX, Digital Unix, HPUX 10, more? */
if(CURL_NAMELOOKUP_SIZE >=
(sizeof(struct hostent)+sizeof(struct hostent_data)))
/* August 22nd, 2000: Albert Chin-A-Young brought an updated version
* that should work! September 20: Richard Prescott worked on the buffer
* size dilemma. */
ret = gethostbyname_r(hostname,
(struct hostent *)buf,
(struct hostent_data *)(buf + sizeof(struct hostent)));
else
ret = -1; /* failure, too smallish buffer size */
/* result expected in h */
h = (struct hostent*)buf;
h_errnop= errno; /* we don't deal with this, but set it anyway */
if(ret)
#endif
{
infof(data, "gethostbyname_r(2) failed for %s\n", hostname);
h = NULL; /* set return code to NULL */
free(buf);
*bufp=NULL;
}
#else
else {
if ((h = gethostbyname(hostname)) == NULL ) {
infof(data, "gethostbyname(2) failed for %s\n", hostname);
free(buf);
*bufp=NULL;
}
else
/* we make a copy of the hostent right now, right here, as the
static one we got a pointer to might get removed when we don't
want/expect that */
h = pack_hostent(buf, h);
#endif
}
return (h);
}
#endif /* end of IPv4-specific code */
/*
* local variables:
* eval: (load-file "../curl-mode.el")
* end:
* vim600: fdm=marker
* vim: et sw=2 ts=2 sts=2 tw=78
*/
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