/*
* getaddrinfo_thread() resolves a name and then exits.
*
* For builds without ARES, but with ENABLE_IPV6, create a resolver thread
* and wait on it.
*/
static unsigned int CURL_STDCALL getaddrinfo_thread (void *arg)
{
struct thread_sync_data *tsd = (struct thread_sync_data*)arg;
struct thread_data *td = tsd->td;
char service[12];
int rc;
snprintf(service, sizeof(service), "%d", tsd->port);
rc = Curl_getaddrinfo_ex(tsd->hostname, service, &tsd->hints, &tsd->res);
if(rc != 0) {
tsd->sock_error = SOCKERRNO?SOCKERRNO:rc;
if(tsd->sock_error == 0)
tsd->sock_error = RESOLVER_ENOMEM;
}
else {
Curl_addrinfo_set_port(tsd->res, tsd->port);
}
Curl_mutex_acquire(tsd->mtx);
if(tsd->done) {
/* too late, gotta clean up the mess */
Curl_mutex_release(tsd->mtx);
destroy_thread_sync_data(tsd);
free(td);
}
else {
tsd->done = 1;
Curl_mutex_release(tsd->mtx);
}
return 0;
}
/*
* Curl_getaddrinfo() when built ipv6-enabled (non-threading and
* non-ares version).
*
* Returns 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 memory *MUST* be freed with
* Curl_freeaddrinfo(), nothing else.
*/
Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
const char *hostname,
int port,
int *waitp)
{
struct addrinfo hints;
Curl_addrinfo *res;
int error;
char sbuf[12];
char *sbufptr = NULL;
char addrbuf[128];
int pf;
struct SessionHandle *data = conn->data;
*waitp = 0; /* synchronous response only */
/*
* Check if a limited name resolve has been requested.
*/
switch(conn->ip_version) {
case CURL_IPRESOLVE_V4:
pf = PF_INET;
break;
case CURL_IPRESOLVE_V6:
pf = PF_INET6;
break;
default:
pf = PF_UNSPEC;
break;
}
if((pf != PF_INET) && !Curl_ipv6works())
/* the stack seems to be a non-ipv6 one */
pf = PF_INET;
memset(&hints, 0, sizeof(hints));
hints.ai_family = pf;
hints.ai_socktype = conn->socktype;
if((1 == Curl_inet_pton(AF_INET, hostname, addrbuf)) ||
(1 == Curl_inet_pton(AF_INET6, hostname, addrbuf))) {
/* the given address is numerical only, prevent a reverse lookup */
hints.ai_flags = AI_NUMERICHOST;
}
if(port) {
snprintf(sbuf, sizeof(sbuf), "%d", port);
sbufptr=sbuf;
}
error = Curl_getaddrinfo_ex(hostname, sbufptr, &hints, &res);
if(error) {
infof(data, "getaddrinfo(3) failed for %s:%d\n", hostname, port);
return NULL;
}
dump_addrinfo(conn, res);
return res;
}
/*
* getaddrinfo_thread() resolves a name, calls Curl_addrinfo6_callback and then
* exits.
*
* For builds without ARES, but with ENABLE_IPV6, create a resolver thread
* and wait on it.
*/
static unsigned __stdcall getaddrinfo_thread (void *arg)
{
struct connectdata *conn = (struct connectdata*) arg;
struct thread_data *td = (struct thread_data*) conn->async.os_specific;
Curl_addrinfo *res;
char service [NI_MAXSERV];
int rc;
struct addrinfo hints = td->hints;
/* Duplicate the passed mutex handle.
* This allows us to use it even after the container gets destroyed
* due to a resolver timeout.
*/
struct thread_sync_data tsd = { 0, 0, 0, NULL };
if (!init_thread_sync_data(td, conn->async.hostname, &tsd))
{
/* thread synchronization data initialization failed */
return -1;
}
itoa(conn->async.port, service, 10);
conn->async.status = NO_DATA; /* pending status */
SET_SOCKERRNO(conn->async.status);
/* Signaling that we have initialized all copies of data and handles we
need */
SetEvent(td->event_thread_started);
rc = Curl_getaddrinfo_ex(tsd.hostname, service, &hints, &res);
/* is parent thread waiting for us and are we able to access conn members? */
if (acquire_thread_sync(&tsd))
{
/* Mark that we have obtained the information, and that we are calling
back with it. */
SetEvent(td->event_resolved);
if (rc == 0)
{
rc = Curl_addrinfo6_callback(conn, CURL_ASYNC_SUCCESS, res);
}
else
{
rc = Curl_addrinfo6_callback(conn, SOCKERRNO, NULL);
}
release_thread_sync(&tsd);
}
/* clean up */
destroy_thread_sync_data(&tsd);
return (rc);
/* An implicit _endthreadex() here */
}
/*
* getaddrinfo_thread() resolves a name and then exits.
*
* For builds without ARES, but with ENABLE_IPV6, create a resolver thread
* and wait on it.
*/
static unsigned int CURL_STDCALL getaddrinfo_thread (void *arg)
{
struct thread_sync_data *tsd = (struct thread_sync_data*)arg;
char service [NI_MAXSERV];
int rc;
snprintf(service, sizeof(service), "%d", tsd->port);
rc = Curl_getaddrinfo_ex(tsd->hostname, service, &tsd->hints, &tsd->res);
if(rc != 0) {
tsd->sock_error = SOCKERRNO?SOCKERRNO:rc;
if(tsd->sock_error == 0)
tsd->sock_error = RESOLVER_ENOMEM;
}
Curl_mutex_acquire(tsd->mtx);
tsd->done = 1;
Curl_mutex_release(tsd->mtx);
return 0;
}
/*
* Curl_resolver_getaddrinfo() - for getaddrinfo
*/
Curl_addrinfo *Curl_resolver_getaddrinfo(struct connectdata *conn,
const char *hostname,
int port,
int *waitp)
{
struct addrinfo hints;
struct in_addr in;
Curl_addrinfo *res;
int error;
char sbuf[12];
int pf = PF_INET;
#ifdef CURLRES_IPV6
struct in6_addr in6;
#endif /* CURLRES_IPV6 */
*waitp = 0; /* default to synchronous response */
#ifndef USE_RESOLVE_ON_IPS
/* First check if this is an IPv4 address string */
if(Curl_inet_pton(AF_INET, hostname, &in) > 0)
/* This is a dotted IP address 123.123.123.123-style */
return Curl_ip2addr(AF_INET, &in, hostname, port);
#ifdef CURLRES_IPV6
/* check if this is an IPv6 address string */
if(Curl_inet_pton(AF_INET6, hostname, &in6) > 0)
/* This is an IPv6 address literal */
return Curl_ip2addr(AF_INET6, &in6, hostname, port);
#endif /* CURLRES_IPV6 */
#endif /* !USE_RESOLVE_ON_IPS */
#ifdef CURLRES_IPV6
/*
* Check if a limited name resolve has been requested.
*/
switch(conn->ip_version) {
case CURL_IPRESOLVE_V4:
pf = PF_INET;
break;
case CURL_IPRESOLVE_V6:
pf = PF_INET6;
break;
default:
pf = PF_UNSPEC;
break;
}
if((pf != PF_INET) && !Curl_ipv6works())
/* The stack seems to be a non-IPv6 one */
pf = PF_INET;
#endif /* CURLRES_IPV6 */
memset(&hints, 0, sizeof(hints));
hints.ai_family = pf;
hints.ai_socktype = conn->socktype;
snprintf(sbuf, sizeof(sbuf), "%d", port);
/* fire up a new resolver thread! */
if(init_resolve_thread(conn, hostname, port, &hints)) {
*waitp = 1; /* expect asynchronous response */
return NULL;
}
/* fall-back to blocking version */
infof(conn->data, "init_resolve_thread() failed for %s; %s\n",
hostname, Curl_strerror(conn, ERRNO));
error = Curl_getaddrinfo_ex(hostname, sbuf, &hints, &res);
if(error) {
infof(conn->data, "getaddrinfo() failed for %s:%d; %s\n",
hostname, port, Curl_strerror(conn, SOCKERRNO));
return NULL;
}
else {
Curl_addrinfo_set_port(res, port);
}
return res;
}
/*
* Curl_getaddrinfo() - for Windows threading IPv6 enabled
*/
Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
const char *hostname,
int port,
int *waitp)
{
struct addrinfo hints;
Curl_addrinfo *res;
int error;
char sbuf[NI_MAXSERV];
int pf;
struct SessionHandle *data = conn->data;
*waitp = FALSE; /* default to synch response */
/*
* Check if a limited name resolve has been requested.
*/
switch(data->set.ip_version) {
case CURL_IPRESOLVE_V4:
pf = PF_INET;
break;
case CURL_IPRESOLVE_V6:
pf = PF_INET6;
break;
default:
pf = PF_UNSPEC;
break;
}
if (pf != PF_INET) {
/* see if we have an IPv6 stack */
curl_socket_t s = socket(PF_INET6, SOCK_DGRAM, 0);
if(s == CURL_SOCKET_BAD) {
/* Some non-IPv6 stacks have been found to make very slow name resolves
* when PF_UNSPEC is used, so thus we switch to a mere PF_INET lookup if
* the stack seems to be a non-ipv6 one. */
pf = PF_INET;
}
else {
/* This seems to be an IPv6-capable stack, use PF_UNSPEC for the widest
* possible checks. And close the socket again.
*/
sclose(s);
}
}
memset(&hints, 0, sizeof(hints));
hints.ai_family = pf;
hints.ai_socktype = conn->socktype;
#if 0 /* removed nov 8 2005 before 7.15.1 */
hints.ai_flags = AI_CANONNAME;
#endif
itoa(port, sbuf, 10);
/* fire up a new resolver thread! */
if(init_resolve_thread(conn, hostname, port, &hints)) {
*waitp = TRUE; /* please wait for the response */
return NULL;
}
/* fall-back to blocking version */
infof(data, "init_resolve_thread() failed for %s; %s\n",
hostname, Curl_strerror(conn, ERRNO));
error = Curl_getaddrinfo_ex(hostname, sbuf, &hints, &res);
if(error) {
infof(data, "getaddrinfo() failed for %s:%d; %s\n",
hostname, port, Curl_strerror(conn, SOCKERRNO));
return NULL;
}
return res;
}
/*
* Curl_getaddrinfo() when built ipv6-enabled (non-threading and
* non-ares version).
*
* Returns 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 memory *MUST* be freed with
* Curl_freeaddrinfo(), nothing else.
*/
Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
const char *hostname,
int port,
int *waitp)
{
struct addrinfo hints;
Curl_addrinfo *res;
int error;
char sbuf[NI_MAXSERV];
char *sbufptr = NULL;
char addrbuf[128];
int pf;
struct SessionHandle *data = conn->data;
*waitp = 0; /* don't wait, we have the response now */
/*
* Check if a limited name resolve has been requested.
*/
switch (data->set.ip_version)
{
case CURL_IPRESOLVE_V4:
pf = PF_INET;
break;
case CURL_IPRESOLVE_V6:
pf = PF_INET6;
break;
default:
pf = PF_UNSPEC;
break;
}
if (pf != PF_INET)
{
/* see if we have an IPv6 stack */
curl_socket_t s = socket(PF_INET6, SOCK_DGRAM, 0);
if (s == CURL_SOCKET_BAD)
{
/* Some non-IPv6 stacks have been found to make very slow name resolves
* when PF_UNSPEC is used, so thus we switch to a mere PF_INET lookup if
* the stack seems to be a non-ipv6 one. */
pf = PF_INET;
}
else
{
/* This seems to be an IPv6-capable stack, use PF_UNSPEC for the widest
* possible checks. And close the socket again.
*/
sclose(s);
}
}
MEMSET(&hints, 0, sizeof(hints));
hints.ai_family = pf;
hints.ai_socktype = conn->socktype;
if ((1 == Curl_inet_pton(AF_INET, hostname, addrbuf)) ||
(1 == Curl_inet_pton(AF_INET6, hostname, addrbuf)))
{
/* the given address is numerical only, prevent a reverse lookup */
hints.ai_flags = AI_NUMERICHOST;
}
#ifdef HAVE_GSSAPI
if (conn->data->set.krb)
/* if krb is used, we (might) need the canonical host name */
hints.ai_flags |= AI_CANONNAME;
#endif
if (port)
{
snprintf(sbuf, sizeof(sbuf), "%d", port);
sbufptr = sbuf;
}
error = Curl_getaddrinfo_ex(hostname, sbufptr, &hints, &res);
if (error)
{
infof(data, "getaddrinfo(3) failed for %s:%d\n", hostname, port);
return NULL;
}
dump_addrinfo(conn, res);
return res;
}
/*
* Curl_ipv4_resolve_r() - ipv4 threadsafe resolver function.
*
* This is used for both synchronous and asynchronous resolver builds,
* implying that only threadsafe code and function calls may be used.
*
*/
Curl_addrinfo *Curl_ipv4_resolve_r(const char *hostname,
int port)
{
#if !defined(HAVE_GETADDRINFO_THREADSAFE) && defined(HAVE_GETHOSTBYNAME_R_3)
int res;
#endif
Curl_addrinfo *ai = NULL;
struct hostent *h = NULL;
struct in_addr in;
struct hostent *buf = NULL;
if(Curl_inet_pton(AF_INET, hostname, &in) > 0)
/* This is a dotted IP address 123.123.123.123-style */
return Curl_ip2addr(AF_INET, &in, hostname, port);
#if defined(HAVE_GETADDRINFO_THREADSAFE)
else {
struct addrinfo hints;
char sbuf[NI_MAXSERV];
char *sbufptr = NULL;
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_INET;
hints.ai_socktype = SOCK_STREAM;
if(port) {
snprintf(sbuf, sizeof(sbuf), "%d", port);
sbufptr = sbuf;
}
(void)Curl_getaddrinfo_ex(hostname, sbufptr, &hints, &ai);
#elif defined(HAVE_GETHOSTBYNAME_R)
/*
* gethostbyname_r() is the preferred resolve function for many platforms.
* Since there are three different versions of it, the following code is
* somewhat #ifdef-ridden.
*/
else {
int h_errnop;
buf = calloc(1, CURL_HOSTENT_SIZE);
if(!buf)
return NULL; /* major failure */
/*
* The clearing of the buffer is a workaround for a gethostbyname_r bug in
* qnx nto and it is also _required_ for some of these functions on some
* platforms.
*/
#if defined(HAVE_GETHOSTBYNAME_R_5)
/* Solaris, IRIX and more */
h = gethostbyname_r(hostname,
(struct hostent *)buf,
(char *)buf + sizeof(struct hostent),
CURL_HOSTENT_SIZE - sizeof(struct hostent),
&h_errnop);
/* If the buffer is too small, it returns NULL and sets errno to
* ERANGE. The errno is thread safe if this is compiled with
* -D_REENTRANT as then the 'errno' variable is a macro defined to get
* used properly for threads.
*/
if(h) {
;
}
else
#elif defined(HAVE_GETHOSTBYNAME_R_6)
/* Linux */
(void)gethostbyname_r(hostname,
(struct hostent *)buf,
(char *)buf + sizeof(struct hostent),
CURL_HOSTENT_SIZE - sizeof(struct hostent),
&h, /* DIFFERENCE */
&h_errnop);
/* Redhat 8, using glibc 2.2.93 changed the behavior. Now all of a
* sudden this function returns EAGAIN if the given buffer size is too
* small. Previous versions are known to return ERANGE for the same
* problem.
*
* This wouldn't be such a big problem if older versions wouldn't
* sometimes return EAGAIN on a common failure case. Alas, we can't
* assume that EAGAIN *or* ERANGE means ERANGE for any given version of
* glibc.
*
* For now, we do that and thus we may call the function repeatedly and
* fail for older glibc versions that return EAGAIN, until we run out of
* buffer size (step_size grows beyond CURL_HOSTENT_SIZE).
*
* If anyone has a better fix, please tell us!
*
* -------------------------------------------------------------------
*
* On October 23rd 2003, Dan C dug up more details on the mysteries of
* gethostbyname_r() in glibc:
*
* In glibc 2.2.5 the interface is different (this has also been
* discovered in glibc 2.1.1-6 as shipped by Redhat 6). What I can't
* explain, is that tests performed on glibc 2.2.4-34 and 2.2.4-32
* (shipped/upgraded by Redhat 7.2) don't show this behavior!
*
* In this "buggy" version, the return code is -1 on error and 'errno'
* is set to the ERANGE or EAGAIN code. Note that 'errno' is not a
* thread-safe variable.
*/
if(!h) /* failure */
#elif defined(HAVE_GETHOSTBYNAME_R_3)
/* AIX, Digital Unix/Tru64, HPUX 10, more? */
/* For AIX 4.3 or later, we don't use gethostbyname_r() at all, because of
* the plain fact that it does not return unique full buffers on each
* call, but instead several of the pointers in the hostent structs will
* point to the same actual data! This have the unfortunate down-side that
* our caching system breaks down horribly. Luckily for us though, AIX 4.3
* and more recent versions have a "completely thread-safe"[*] libc where
* all the data is stored in thread-specific memory areas making calls to
* the plain old gethostbyname() work fine even for multi-threaded
* programs.
*
* This AIX 4.3 or later detection is all made in the configure script.
*
* Troels Walsted Hansen helped us work this out on March 3rd, 2003.
*
* [*] = much later we've found out that it isn't at all "completely
* thread-safe", but at least the gethostbyname() function is.
*/
if(CURL_HOSTENT_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.
*/
res = gethostbyname_r(hostname,
(struct hostent *)buf,
(struct hostent_data *)((char *)buf +
sizeof(struct hostent)));
h_errnop = SOCKERRNO; /* we don't deal with this, but set it anyway */
}
else
res = -1; /* failure, too smallish buffer size */
if(!res) { /* success */
h = buf; /* result expected in h */
/* This is the worst kind of the different gethostbyname_r() interfaces.
* Since we don't know how big buffer this particular lookup required,
* we can't realloc down the huge alloc without doing closer analysis of
* the returned data. Thus, we always use CURL_HOSTENT_SIZE for every
* name lookup. Fixing this would require an extra malloc() and then
* calling Curl_addrinfo_copy() that subsequent realloc()s down the new
* memory area to the actually used amount.
*/
}
else
#endif /* HAVE_...BYNAME_R_5 || HAVE_...BYNAME_R_6 || HAVE_...BYNAME_R_3 */
{
h = NULL; /* set return code to NULL */
free(buf);
}
#else /* HAVE_GETADDRINFO_THREADSAFE || HAVE_GETHOSTBYNAME_R */
/*
* Here is code for platforms that don't have a thread safe
* getaddrinfo() nor gethostbyname_r() function or for which
* gethostbyname() is the preferred one.
*/
else {
h = gethostbyname((void*)hostname);
#endif /* HAVE_GETADDRINFO_THREADSAFE || HAVE_GETHOSTBYNAME_R */
}
if(h) {
ai = Curl_he2ai(h, port);
if(buf) /* used a *_r() function */
free(buf);
}
return ai;
}
/*
* Curl_resolver_getaddrinfo() - for getaddrinfo
*/
Curl_addrinfo *Curl_resolver_getaddrinfo(CURL *data,
const char *hostname,
int port,
int *waitp)
{
struct connectdata *conn = data->easy_conn;
struct addrinfo hints;
Curl_addrinfo *res;
int error;
char sbuf[12];
int pf = PF_INET;
*waitp = 0; /* default to synchronous response */
#ifndef USE_RESOLVE_ON_IPS
res = Curl_str2addr(hostname, port);
if(res)
return res;
#endif
#ifdef CURLRES_IPV6
/*
* Check if a limited name resolve has been requested.
*/
switch(conn->ip_version) {
case CURL_IPRESOLVE_V4:
pf = PF_INET;
break;
case CURL_IPRESOLVE_V6:
pf = PF_INET6;
break;
default:
pf = PF_UNSPEC;
break;
}
if((pf != PF_INET) && !Curl_ipv6works())
/* The stack seems to be a non-IPv6 one */
pf = PF_INET;
#endif /* CURLRES_IPV6 */
memset(&hints, 0, sizeof(hints));
hints.ai_family = pf;
hints.ai_socktype = conn->socktype;
snprintf(sbuf, sizeof(sbuf), "%d", port);
/* fire up a new resolver thread! */
if(init_resolve_thread(conn, hostname, port, &hints)) {
*waitp = 1; /* expect asynchronous response */
return NULL;
}
/* fall-back to blocking version */
infof(data, "init_resolve_thread() failed for %s; %s\n",
hostname, Curl_strerror(conn, errno));
error = Curl_getaddrinfo_ex(hostname, sbuf, &hints, &res);
if(error) {
infof(data, "getaddrinfo() failed for %s:%d; %s\n",
hostname, port, Curl_strerror(conn, SOCKERRNO));
return NULL;
}
else {
Curl_addrinfo_set_port(res, port);
}
return res;
}
