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67bb7926ed
curl/lib/curl_addrinfo.c
Daniel Stenberg 401cb92954
memdebug: log pointer before freeing its data 
Coverity warned for two potentional "Use after free" cases. Both are false
positives because the memory wasn't used, it was only the actual pointer
value that was logged.

The fix still changes the order of execution to avoid the warnings.

Coverity CID 1443033 and 1443034

Closes #3671
2019-03-12 21:45:03 +01:00

625 lines
16 KiB
C
Raw Blame History

/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.haxx.se/docs/copyright.html.
*
* 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 COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "curl_setup.h"
#include <curl/curl.h>
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#ifdef HAVE_NETINET_IN6_H
# include <netinet/in6.h>
#endif
#ifdef HAVE_NETDB_H
# include <netdb.h>
#endif
#ifdef HAVE_ARPA_INET_H
# include <arpa/inet.h>
#endif
#ifdef HAVE_SYS_UN_H
# include <sys/un.h>
#endif
#ifdef __VMS
# include <in.h>
# include <inet.h>
#endif
#if defined(NETWARE) && defined(__NOVELL_LIBC__)
# undef in_addr_t
# define in_addr_t unsigned long
#endif
#if defined(WIN32) && defined(USE_UNIX_SOCKETS)
#include <afunix.h>
#endif
#include <stddef.h>
#include "curl_addrinfo.h"
#include "inet_pton.h"
#include "warnless.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
/*
* Curl_freeaddrinfo()
*
* This is used to free a linked list of Curl_addrinfo structs along
* with all its associated allocated storage. This function should be
* called once for each successful call to Curl_getaddrinfo_ex() or to
* any function call which actually allocates a Curl_addrinfo struct.
*/
#if defined(__INTEL_COMPILER) && (__INTEL_COMPILER == 910) && \
defined(__OPTIMIZE__) && defined(__unix__) && defined(__i386__)
/* workaround icc 9.1 optimizer issue */
# define vqualifier volatile
#else
# define vqualifier
#endif
void
Curl_freeaddrinfo(Curl_addrinfo *cahead)
{
Curl_addrinfo *vqualifier canext;
Curl_addrinfo *ca;
for(ca = cahead; ca != NULL; ca = canext) {
free(ca->ai_addr);
free(ca->ai_canonname);
canext = ca->ai_next;
free(ca);
}
}
#ifdef HAVE_GETADDRINFO
/*
* Curl_getaddrinfo_ex()
*
* This is a wrapper function around system's getaddrinfo(), with
* the only difference that instead of returning a linked list of
* addrinfo structs this one returns a linked list of Curl_addrinfo
* ones. The memory allocated by this function *MUST* be free'd with
* Curl_freeaddrinfo(). For each successful call to this function
* there must be an associated call later to Curl_freeaddrinfo().
*
* There should be no single call to system's getaddrinfo() in the
* whole library, any such call should be 'routed' through this one.
*/
int
Curl_getaddrinfo_ex(const char *nodename,
const char *servname,
const struct addrinfo *hints,
Curl_addrinfo **result)
{
const struct addrinfo *ai;
struct addrinfo *aihead;
Curl_addrinfo *cafirst = NULL;
Curl_addrinfo *calast = NULL;
Curl_addrinfo *ca;
size_t ss_size;
int error;
*result = NULL; /* assume failure */
error = getaddrinfo(nodename, servname, hints, &aihead);
if(error)
return error;
/* traverse the addrinfo list */
for(ai = aihead; ai != NULL; ai = ai->ai_next) {
/* ignore elements with unsupported address family, */
/* settle family-specific sockaddr structure size. */
if(ai->ai_family == AF_INET)
ss_size = sizeof(struct sockaddr_in);
#ifdef ENABLE_IPV6
else if(ai->ai_family == AF_INET6)
ss_size = sizeof(struct sockaddr_in6);
#endif
else
continue;
/* ignore elements without required address info */
if((ai->ai_addr == NULL) || !(ai->ai_addrlen > 0))
continue;
/* ignore elements with bogus address size */
if((size_t)ai->ai_addrlen < ss_size)
continue;
ca = malloc(sizeof(Curl_addrinfo));
if(!ca) {
error = EAI_MEMORY;
break;
}
/* copy each structure member individually, member ordering, */
/* size, or padding might be different for each platform. */
ca->ai_flags = ai->ai_flags;
ca->ai_family = ai->ai_family;
ca->ai_socktype = ai->ai_socktype;
ca->ai_protocol = ai->ai_protocol;
ca->ai_addrlen = (curl_socklen_t)ss_size;
ca->ai_addr = NULL;
ca->ai_canonname = NULL;
ca->ai_next = NULL;
ca->ai_addr = malloc(ss_size);
if(!ca->ai_addr) {
error = EAI_MEMORY;
free(ca);
break;
}
memcpy(ca->ai_addr, ai->ai_addr, ss_size);
if(ai->ai_canonname != NULL) {
ca->ai_canonname = strdup(ai->ai_canonname);
if(!ca->ai_canonname) {
error = EAI_MEMORY;
free(ca->ai_addr);
free(ca);
break;
}
}
/* if the return list is empty, this becomes the first element */
if(!cafirst)
cafirst = ca;
/* add this element last in the return list */
if(calast)
calast->ai_next = ca;
calast = ca;
}
/* destroy the addrinfo list */
if(aihead)
freeaddrinfo(aihead);
/* if we failed, also destroy the Curl_addrinfo list */
if(error) {
Curl_freeaddrinfo(cafirst);
cafirst = NULL;
}
else if(!cafirst) {
#ifdef EAI_NONAME
/* rfc3493 conformant */
error = EAI_NONAME;
#else
/* rfc3493 obsoleted */
error = EAI_NODATA;
#endif
#ifdef USE_WINSOCK
SET_SOCKERRNO(error);
#endif
}
*result = cafirst;
/* This is not a CURLcode */
return error;
}
#endif /* HAVE_GETADDRINFO */
/*
* Curl_he2ai()
*
* This function returns a pointer to the first element of a newly allocated
* Curl_addrinfo struct linked list filled with the data of a given hostent.
* Curl_addrinfo is meant to work like the addrinfo struct does for a IPv6
* stack, but usable also for IPv4, all hosts and environments.
*
* The memory allocated by this function *MUST* be free'd later on calling
* Curl_freeaddrinfo(). For each successful call to this function there
* must be an associated call later to Curl_freeaddrinfo().
*
* Curl_addrinfo defined in "lib/curl_addrinfo.h"
*
* struct Curl_addrinfo {
* int ai_flags;
* int ai_family;
* int ai_socktype;
* int ai_protocol;
* curl_socklen_t ai_addrlen; * Follow rfc3493 struct addrinfo *
* char *ai_canonname;
* struct sockaddr *ai_addr;
* struct Curl_addrinfo *ai_next;
* };
* typedef struct Curl_addrinfo Curl_addrinfo;
*
* hostent defined in <netdb.h>
*
* struct hostent {
* char *h_name;
* char **h_aliases;
* int h_addrtype;
* int h_length;
* char **h_addr_list;
* };
*
* for backward compatibility:
*
* #define h_addr h_addr_list[0]
*/
Curl_addrinfo *
Curl_he2ai(const struct hostent *he, int port)
{
Curl_addrinfo *ai;
Curl_addrinfo *prevai = NULL;
Curl_addrinfo *firstai = NULL;
struct sockaddr_in *addr;
#ifdef ENABLE_IPV6
struct sockaddr_in6 *addr6;
#endif
CURLcode result = CURLE_OK;
int i;
char *curr;
if(!he)
/* no input == no output! */
return NULL;
DEBUGASSERT((he->h_name != NULL) && (he->h_addr_list != NULL));
for(i = 0; (curr = he->h_addr_list[i]) != NULL; i++) {
size_t ss_size;
#ifdef ENABLE_IPV6
if(he->h_addrtype == AF_INET6)
ss_size = sizeof(struct sockaddr_in6);
else
#endif
ss_size = sizeof(struct sockaddr_in);
ai = calloc(1, sizeof(Curl_addrinfo));
if(!ai) {
result = CURLE_OUT_OF_MEMORY;
break;
}
ai->ai_canonname = strdup(he->h_name);
if(!ai->ai_canonname) {
result = CURLE_OUT_OF_MEMORY;
free(ai);
break;
}
ai->ai_addr = calloc(1, ss_size);
if(!ai->ai_addr) {
result = CURLE_OUT_OF_MEMORY;
free(ai->ai_canonname);
free(ai);
break;
}
if(!firstai)
/* store the pointer we want to return from this function */
firstai = ai;
if(prevai)
/* make the previous entry point to this */
prevai->ai_next = ai;
ai->ai_family = he->h_addrtype;
/* we return all names as STREAM, so when using this address for TFTP
the type must be ignored and conn->socktype be used instead! */
ai->ai_socktype = SOCK_STREAM;
ai->ai_addrlen = (curl_socklen_t)ss_size;
/* leave the rest of the struct filled with zero */
switch(ai->ai_family) {
case AF_INET:
addr = (void *)ai->ai_addr; /* storage area for this info */
memcpy(&addr->sin_addr, curr, sizeof(struct in_addr));
addr->sin_family = (CURL_SA_FAMILY_T)(he->h_addrtype);
addr->sin_port = htons((unsigned short)port);
break;
#ifdef ENABLE_IPV6
case AF_INET6:
addr6 = (void *)ai->ai_addr; /* storage area for this info */
memcpy(&addr6->sin6_addr, curr, sizeof(struct in6_addr));
addr6->sin6_family = (CURL_SA_FAMILY_T)(he->h_addrtype);
addr6->sin6_port = htons((unsigned short)port);
break;
#endif
}
prevai = ai;
}
if(result) {
Curl_freeaddrinfo(firstai);
firstai = NULL;
}
return firstai;
}
struct namebuff {
struct hostent hostentry;
union {
struct in_addr ina4;
#ifdef ENABLE_IPV6
struct in6_addr ina6;
#endif
} addrentry;
char *h_addr_list[2];
};
/*
* Curl_ip2addr()
*
* This function takes an internet address, in binary form, as input parameter
* along with its address family and the string version of the address, and it
* returns a Curl_addrinfo chain filled in correctly with information for the
* given address/host
*/
Curl_addrinfo *
Curl_ip2addr(int af, const void *inaddr, const char *hostname, int port)
{
Curl_addrinfo *ai;
#if defined(__VMS) && \
defined(__INITIAL_POINTER_SIZE) && (__INITIAL_POINTER_SIZE == 64)
#pragma pointer_size save
#pragma pointer_size short
#pragma message disable PTRMISMATCH
#endif
struct hostent *h;
struct namebuff *buf;
char *addrentry;
char *hoststr;
size_t addrsize;
DEBUGASSERT(inaddr && hostname);
buf = malloc(sizeof(struct namebuff));
if(!buf)
return NULL;
hoststr = strdup(hostname);
if(!hoststr) {
free(buf);
return NULL;
}
switch(af) {
case AF_INET:
addrsize = sizeof(struct in_addr);
addrentry = (void *)&buf->addrentry.ina4;
memcpy(addrentry, inaddr, sizeof(struct in_addr));
break;
#ifdef ENABLE_IPV6
case AF_INET6:
addrsize = sizeof(struct in6_addr);
addrentry = (void *)&buf->addrentry.ina6;
memcpy(addrentry, inaddr, sizeof(struct in6_addr));
break;
#endif
default:
free(hoststr);
free(buf);
return NULL;
}
h = &buf->hostentry;
h->h_name = hoststr;
h->h_aliases = NULL;
h->h_addrtype = (short)af;
h->h_length = (short)addrsize;
h->h_addr_list = &buf->h_addr_list[0];
h->h_addr_list[0] = addrentry;
h->h_addr_list[1] = NULL; /* terminate list of entries */
#if defined(__VMS) && \
defined(__INITIAL_POINTER_SIZE) && (__INITIAL_POINTER_SIZE == 64)
#pragma pointer_size restore
#pragma message enable PTRMISMATCH
#endif
ai = Curl_he2ai(h, port);
free(hoststr);
free(buf);
return ai;
}
/*
* Given an IPv4 or IPv6 dotted string address, this converts it to a proper
* allocated Curl_addrinfo struct and returns it.
*/
Curl_addrinfo *Curl_str2addr(char *address, int port)
{
struct in_addr in;
if(Curl_inet_pton(AF_INET, address, &in) > 0)
/* This is a dotted IP address 123.123.123.123-style */
return Curl_ip2addr(AF_INET, &in, address, port);
#ifdef ENABLE_IPV6
{
struct in6_addr in6;
if(Curl_inet_pton(AF_INET6, address, &in6) > 0)
/* This is a dotted IPv6 address ::1-style */
return Curl_ip2addr(AF_INET6, &in6, address, port);
}
#endif
return NULL; /* bad input format */
}
#ifdef USE_UNIX_SOCKETS
/**
* Given a path to a Unix domain socket, return a newly allocated Curl_addrinfo
* struct initialized with this path.
* Set '*longpath' to TRUE if the error is a too long path.
*/
Curl_addrinfo *Curl_unix2addr(const char *path, bool *longpath, bool abstract)
{
Curl_addrinfo *ai;
struct sockaddr_un *sa_un;
size_t path_len;
*longpath = FALSE;
ai = calloc(1, sizeof(Curl_addrinfo));
if(!ai)
return NULL;
ai->ai_addr = calloc(1, sizeof(struct sockaddr_un));
if(!ai->ai_addr) {
free(ai);
return NULL;
}
sa_un = (void *) ai->ai_addr;
sa_un->sun_family = AF_UNIX;
/* sun_path must be able to store the NUL-terminated path */
path_len = strlen(path) + 1;
if(path_len > sizeof(sa_un->sun_path)) {
free(ai->ai_addr);
free(ai);
*longpath = TRUE;
return NULL;
}
ai->ai_family = AF_UNIX;
ai->ai_socktype = SOCK_STREAM; /* assume reliable transport for HTTP */
ai->ai_addrlen = (curl_socklen_t)
((offsetof(struct sockaddr_un, sun_path) + path_len) & 0x7FFFFFFF);
/* Abstract Unix domain socket have NULL prefix instead of suffix */
if(abstract)
memcpy(sa_un->sun_path + 1, path, path_len - 1);
else
memcpy(sa_un->sun_path, path, path_len); /* copy NUL byte */
return ai;
}
#endif
#if defined(CURLDEBUG) && defined(HAVE_GETADDRINFO) && \
defined(HAVE_FREEADDRINFO)
/*
* curl_dbg_freeaddrinfo()
*
* This is 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 structs I didn't want to include in memdebug.c
*/
void
curl_dbg_freeaddrinfo(struct addrinfo *freethis,
int line, const char *source)
{
curl_dbg_log("ADDR %s:%d freeaddrinfo(%p)\n",
source, line, (void *)freethis);
#ifdef USE_LWIPSOCK
lwip_freeaddrinfo(freethis);
#else
(freeaddrinfo)(freethis);
#endif
}
#endif /* defined(CURLDEBUG) && defined(HAVE_FREEADDRINFO) */
#if defined(CURLDEBUG) && defined(HAVE_GETADDRINFO)
/*
* curl_dbg_getaddrinfo()
*
* This is 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 structs I didn't want to include in memdebug.c
*/
int
curl_dbg_getaddrinfo(const char *hostname,
const char *service,
const struct addrinfo *hints,
struct addrinfo **result,
int line, const char *source)
{
#ifdef USE_LWIPSOCK
int res = lwip_getaddrinfo(hostname, service, hints, result);
#else
int res = (getaddrinfo)(hostname, service, hints, result);
#endif
if(0 == res)
/* success */
curl_dbg_log("ADDR %s:%d getaddrinfo() = %p\n",
source, line, (void *)*result);
else
curl_dbg_log("ADDR %s:%d getaddrinfo() failed\n",
source, line);
return res;
}
#endif /* defined(CURLDEBUG) && defined(HAVE_GETADDRINFO) */
#if defined(HAVE_GETADDRINFO) && defined(USE_RESOLVE_ON_IPS)
/*
* Work-arounds the sin6_port is always zero bug on iOS 9.3.2 and Mac OS X
* 10.11.5.
*/
void Curl_addrinfo_set_port(Curl_addrinfo *addrinfo, int port)
{
Curl_addrinfo *ca;
struct sockaddr_in *addr;
#ifdef ENABLE_IPV6
struct sockaddr_in6 *addr6;
#endif
for(ca = addrinfo; ca != NULL; ca = ca->ai_next) {
switch(ca->ai_family) {
case AF_INET:
addr = (void *)ca->ai_addr; /* storage area for this info */
addr->sin_port = htons((unsigned short)port);
break;
#ifdef ENABLE_IPV6
case AF_INET6:
addr6 = (void *)ca->ai_addr; /* storage area for this info */
addr6->sin6_port = htons((unsigned short)port);
break;
#endif
}
}
}
#endif
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