/*
* $LynxId: HTTCP.c,v 1.93 2007/05/22 23:54:43 tom Exp $
*
* Generic Communication Code HTTCP.c
* ==========================
*
* This code is in common between client and server sides.
*
* 16 Jan 92 TBL Fix strtol() undefined on CMU Mach.
* 25 Jun 92 JFG Added DECNET option through TCP socket emulation.
* 13 Sep 93 MD Added correct return of vmserrorno for HTInetStatus.
* Added decoding of vms error message for MULTINET.
* 7-DEC-1993 Bjorn S. Nilsson, ALEPH, CERN, VMS UCX ioctl() changes
* (done of Mosaic)
* 19 Feb 94 Danny Mayer Added Bjorn Fixes to Lynx version
* 7 Mar 94 Danny Mayer Added Fix UCX version for full domain name
* 20 May 94 Andy Harper Added support for CMU TCP/IP transport
* 17 Nov 94 Andy Harper Added support for SOCKETSHR transport
* 16 Jul 95 S. Bjorndahl added kluge to deal with LIBCMU bug
*/
#include <HTUtils.h>
#include <HTParse.h>
#include <HTAlert.h>
#include <HTTCP.h>
#include <LYGlobalDefs.h> /* added for no_suspend */
#include <LYUtils.h>
#ifdef NSL_FORK
#include <signal.h>
#include <www_wait.h>
#endif /* NSL_FORK */
#ifdef HAVE_RESOLV_H
#include <resolv.h>
#endif
#ifdef __DJGPP__
#include <netdb.h>
#endif /* __DJGPP__ */
#define LYNX_ADDRINFO struct addrinfo
#define LYNX_HOSTENT struct hostent
#define OK_HOST(p) ((p) != 0 && ((p)->h_length) != 0)
#ifdef SVR4_BSDSELECT
int BSDselect(int nfds,
fd_set * readfds,
fd_set * writefds,
fd_set * exceptfds,
struct timeval *select_timeout);
#ifdef select
#undef select
#endif /* select */
#define select BSDselect
#ifdef SOCKS
#ifdef Rselect
#undef Rselect
#endif /* Rselect */
#define Rselect BSDselect
#endif /* SOCKS */
#endif /* SVR4_BSDSELECT */
#include <LYLeaks.h>
/*
* Module-Wide variables
*/
static char *hostname = NULL; /* The name of this host */
/*
* PUBLIC VARIABLES
*/
#ifdef SOCKS
unsigned long socks_bind_remoteAddr; /* for long Rbind */
#endif /* SOCKS */
/* PUBLIC SockA HTHostAddress; *//* The internet address of the host */
/* Valid after call to HTHostName() */
/* Encode INET status (as in sys/errno.h) inet_status()
* ------------------
*
* On entry,
* where gives a description of what caused the error
* global errno gives the error number in the Unix way.
*
* On return,
* returns a negative status in the Unix way.
*/
#ifdef DECL_SYS_ERRLIST
extern char *sys_errlist[]; /* see man perror on cernvax */
extern int sys_nerr;
#endif /* DECL_SYS_ERRLIST */
#ifdef __DJGPP__
static int ResolveYield(void)
{
return HTCheckForInterrupt()? 0 : 1;
}
#endif
#if defined(VMS) && defined(UCX)
/*
* A routine to mimic the ioctl function for UCX.
* Bjorn S. Nilsson, 25-Nov-1993. Based on an example in the UCX manual.
*/
#include <HTioctl.h>
int HTioctl(int d,
int request,
int *argp)
{
int sdc, status;
unsigned short fun, iosb[4];
char *p5, *p6;
struct comm {
int command;
char *addr;
} ioctl_comm;
struct it2 {
unsigned short len;
unsigned short opt;
struct comm *addr;
} ioctl_desc;
if ((sdc = vaxc$get_sdc(d)) == 0) {
set_errno(EBADF);
return -1;
}
ioctl_desc.opt = UCX$C_IOCTL;
ioctl_desc.len = sizeof(struct comm);
ioctl_desc.addr = &ioctl_comm;
if (request & IOC_OUT) {
fun = IO$_SENSEMODE;
p5 = 0;
p6 = (char *) &ioctl_desc;
} else {
fun = IO$_SETMODE;
p5 = (char *) &ioctl_desc;
p6 = 0;
}
ioctl_comm.command = request;
ioctl_comm.addr = (char *) argp;
status = sys$qiow(0, sdc, fun, iosb, 0, 0, 0, 0, 0, 0, p5, p6);
if (!(status & 01)) {
set_errno(status);
return -1;
}
if (!(iosb[0] & 01)) {
set_errno(iosb[0]);
return -1;
}
return 0;
}
#endif /* VMS && UCX */
#define MY_FORMAT "TCP: Error %d in `SOCKET_ERRNO' after call to %s() failed.\n\t%s\n"
/* third arg is transport/platform specific */
/* Report Internet Error
* ---------------------
*/
int HTInetStatus(const char *where)
{
int status;
int saved_errno = errno;
#ifdef VMS
#ifdef MULTINET
SOCKET_ERRNO = vmserrno;
#endif /* MULTINET */
#endif /* VMS */
#ifdef VM
CTRACE((tfp, MY_FORMAT, SOCKET_ERRNO, where,
"(Error number not translated)")); /* What Is the VM equiv? */
#define ER_NO_TRANS_DONE
#endif /* VM */
#ifdef VMS
#ifdef MULTINET
CTRACE((tfp, MY_FORMAT, SOCKET_ERRNO, where,
vms_errno_string()));
#else
CTRACE((tfp, MY_FORMAT, SOCKET_ERRNO, where,
((SOCKET_ERRNO > 0 && SOCKET_ERRNO <= 65) ?
strerror(SOCKET_ERRNO) : "(Error number not translated)")));
#endif /* MULTINET */
#define ER_NO_TRANS_DONE
#endif /* VMS */
#ifdef HAVE_STRERROR
CTRACE((tfp, MY_FORMAT, SOCKET_ERRNO, where,
strerror(SOCKET_ERRNO)));
#define ER_NO_TRANS_DONE
#endif /* HAVE_STRERROR */
#ifndef ER_NO_TRANS_DONE
CTRACE((tfp, MY_FORMAT, SOCKET_ERRNO, where,
(SOCKET_ERRNO < sys_nerr ?
sys_errlist[SOCKET_ERRNO] : "Unknown error")));
#endif /* !ER_NO_TRANS_DONE */
#ifdef VMS
#ifndef MULTINET
CTRACE((tfp,
" Unix error number (SOCKET_ERRNO) = %ld dec\n",
SOCKET_ERRNO));
CTRACE((tfp,
" VMS error (vaxc$errno) = %lx hex\n",
vaxc$errno));
#endif /* MULTINET */
#endif /* VMS */
set_errno(saved_errno);
#ifdef VMS
/*
* uerrno and errno happen to be zero if vmserrno <> 0
*/
#ifdef MULTINET
status = -vmserrno;
#else
status = -vaxc$errno;
#endif /* MULTINET */
#else
status = -SOCKET_ERRNO;
#endif /* VMS */
return status;
}
/* Parse a cardinal value parse_cardinal()
* ----------------------
*
* On entry,
* *pp points to first character to be interpreted, terminated by
* non 0:9 character.
* *pstatus points to status already valid
* maxvalue gives the largest allowable value.
*
* On exit,
* *pp points to first unread character
* *pstatus points to status updated iff bad
*/
unsigned int HTCardinal(int *pstatus,
char **pp,
unsigned int max_value)
{
unsigned int n;
if ((**pp < '0') || (**pp > '9')) { /* Null string is error */
*pstatus = -3; /* No number where one expected */
return 0;
}
n = 0;
while ((**pp >= '0') && (**pp <= '9'))
n = n * 10 + *((*pp)++) - '0';
if (n > max_value) {
*pstatus = -4; /* Cardinal outside range */
return 0;
}
return n;
}
#ifndef DECNET /* Function only used below for a trace message */
/* Produce a string for an Internet address
* ----------------------------------------
*
* On exit,
* returns a pointer to a static string which must be copied if
* it is to be kept.
*/
const char *HTInetString(SockA * soc_in)
{
#ifdef INET6
static char hostbuf[MAXHOSTNAMELEN];
getnameinfo((struct sockaddr *) soc_in,
SOCKADDR_LEN(soc_in),
hostbuf, sizeof(hostbuf), NULL, 0, NI_NUMERICHOST);
return hostbuf;
#else
static char string[20];
sprintf(string, "%d.%d.%d.%d",
(int) *((unsigned char *) (&soc_in->sin_addr) + 0),
(int) *((unsigned char *) (&soc_in->sin_addr) + 1),
(int) *((unsigned char *) (&soc_in->sin_addr) + 2),
(int) *((unsigned char *) (&soc_in->sin_addr) + 3));
return string;
#endif /* INET6 */
}
#endif /* !DECNET */
/* Check whether string is a valid Internet hostname - kw
* -------------------------------------------------
*
* Checks whether
* - contains only valid chars for domain names (actually, the
* restrictions are somewhat relaxed),
* - no leading dots or empty segments,
* - no segment starts with '-' or '+' [this protects telnet command],
* - max. length of dot-separated segment <= 63 (RFC 1034,1035),
* - total length <= 254 (if it ends with dot) or 253 (otherwise)
* [an interpretation of RFC 1034,1035, although RFC 1123
* suggests 255 as limit - kw].
*
* Note: user (before '@') and port (after ':') components from
* host part of URL should be already stripped (if appropriate)
* from the input string.
*
* On exit,
* returns 1 if valid, otherwise 0.
*/
BOOL valid_hostname(char *name)
{
int i = 1, iseg = 0;
char *cp = name;
if (!(name && *name))
return NO;
for (; (*cp && i <= 253); cp++, i++) {
if (*cp == '.') {
if (iseg == 0) {
return NO;
} else {
iseg = 0;
continue;
}
} else if (iseg == 0 && (*cp == '-' || *cp == '+')) {
return NO;
} else if (++iseg > 63) {
return NO;
}
if (!isalnum(UCH(*cp)) &&
*cp != '-' && *cp != '_' &&
*cp != '$' && *cp != '+') {
return NO;
}
}
return (BOOL) (*cp == '\0' || (*cp == '.' && iseg != 0 && cp[1] == '\0'));
}
#ifdef NSL_FORK
/*
* Function to allow us to be killed with a normal signal (not
* SIGKILL), but don't go through normal libc exit() processing, which
* would screw up parent's stdio. -BL
*/
static void quench(int sig GCC_UNUSED)
{
_exit(2);
}
#endif /* NSL_FORK */
int lynx_nsl_status = HT_OK;
#define DEBUG_HOSTENT /* disable in case of problems */
#define DEBUG_HOSTENT_CHILD /* for NSL_FORK, may screw up trace file */
/*
* Two auxiliary functions for name lookup and LYNX_HOSTENT.
*
* dump_hostent - dumps the contents of a LYNX_HOSTENT to the
* trace log or stderr, including all pointer values, strings, and
* addresses, in a format inspired by gdb's print format. - kw
*/
static void dump_hostent(const char *msgprefix,
const LYNX_HOSTENT *phost)
{
if (TRACE) {
int i;
char **pcnt;
CTRACE((tfp, "%s: %p ", msgprefix, phost));
if (phost) {
CTRACE((tfp, "{ h_name = %p", phost->h_name));
if (phost->h_name) {
CTRACE((tfp, " \"%s\",", phost->h_name));
} else {
CTRACE((tfp, ","));
}
CTRACE((tfp, "\n\t h_aliases = %p", phost->h_aliases));
if (phost->h_aliases) {
CTRACE((tfp, " {"));
for (pcnt = phost->h_aliases; *pcnt; pcnt++) {
CTRACE((tfp, "%s %p \"%s\"",
(pcnt == phost->h_aliases ? " " : ", "),
*pcnt, *pcnt));
}
CTRACE((tfp, "%s0x0 },\n\t",
(*phost->h_aliases ? ", " : " ")));
} else {
CTRACE((tfp, ",\n\t"));
}
CTRACE((tfp, " h_addrtype = %d,", phost->h_addrtype));
CTRACE((tfp, " h_length = %d,\n\t", phost->h_length));
CTRACE((tfp, " h_addr_list = %p", phost->h_addr_list));
if (phost->h_addr_list) {
CTRACE((tfp, " {"));
for (pcnt = phost->h_addr_list; *pcnt; pcnt++) {
CTRACE((tfp, "%s %p",
(pcnt == phost->h_addr_list ? "" : ","),
*pcnt));
for (i = 0; i < phost->h_length; i++) {
CTRACE((tfp, "%s%d%s", (i == 0 ? " \"" : "."),
(int) *((unsigned char *) (*pcnt) + i),
(i + 1 == phost->h_length ? "\"" : "")));
}
}
if (*phost->h_addr_list) {
CTRACE((tfp, ", 0x0 } }"));
} else {
CTRACE((tfp, " 0x0 } }"));
}
} else {
CTRACE((tfp, "}"));
}
}
CTRACE((tfp, "\n"));
fflush(tfp);
}
}
/*
* fill_rehostent - copies as much as possible relevant content from
* the LYNX_HOSTENT pointed to by phost to the char buffer given
* by rehostent, subject to maximum output length rehostentsize,
* following pointers and building self-contained output which can be
* cast to a LYNX_HOSTENT. - kw
* See also description of LYGetHostByName.
*/
#if defined(NSL_FORK) || defined(_WINDOWS_NSL)
#define REHOSTENT_SIZE 128 /* not bigger than pipe buffer! */
typedef struct {
LYNX_HOSTENT h;
char rest[REHOSTENT_SIZE];
} AlignedHOSTENT;
static size_t fill_rehostent(char *rehostent,
size_t rehostentsize,
const LYNX_HOSTENT *phost)
{
AlignedHOSTENT *data = (AlignedHOSTENT *) rehostent;
int num_addrs = 0;
int num_aliases = 0;
char **pcnt;
char *p_next_char;
char **p_next_charptr;
size_t name_len = 0;
size_t required_per_addr;
size_t curlen = sizeof(LYNX_HOSTENT);
size_t available = rehostentsize - curlen;
size_t chk_available, mem_this_alias, required_this_alias;
int i_addr, i_alias;
if (!phost)
return 0;
required_per_addr = phost->h_length + sizeof(char *);
if (phost->h_addr_list)
available -= sizeof(phost->h_addr_list[0]);
if (phost->h_aliases)
available -= sizeof(phost->h_aliases[0]);
if (phost->h_name)
available--;
if (phost->h_addr_list) {
if (phost->h_addr_list[0]) {
if (available >= required_per_addr) {
num_addrs++;
available -= required_per_addr;
}
}
}
if (phost->h_name) {
name_len = strlen(phost->h_name);
if (available >= name_len) {
available -= name_len;
} else {
name_len = 0;
}
}
if (num_addrs) {
for (pcnt = phost->h_addr_list + 1; *pcnt; pcnt++) {
if (available >= required_per_addr) {
num_addrs++;
available -= required_per_addr;
} else {
break;
}
}
}
chk_available = available;
if (phost->h_aliases) {
for (pcnt = phost->h_aliases; *pcnt; pcnt++) {
required_this_alias = sizeof(phost->h_aliases[0]) +
strlen(*pcnt) + 1;
if (chk_available >= required_this_alias) {
num_aliases++;
chk_available -= required_this_alias;
}
}
}
data->h.h_addrtype = phost->h_addrtype;
data->h.h_length = phost->h_length;
p_next_charptr = (char **) (rehostent + curlen);
p_next_char = rehostent + curlen;
if (phost->h_addr_list)
p_next_char += (num_addrs + 1) * sizeof(phost->h_addr_list[0]);
if (phost->h_aliases)
p_next_char += (num_aliases + 1) * sizeof(phost->h_aliases[0]);
if (phost->h_addr_list) {
data->h.h_addr_list = p_next_charptr;
for (pcnt = phost->h_addr_list, i_addr = 0;
i_addr < num_addrs;
pcnt++, i_addr++) {
memcpy(p_next_char, *pcnt, sizeof(phost->h_addr_list[0]));
*p_next_charptr++ = p_next_char;
p_next_char += sizeof(phost->h_addr_list[0]);
}
*p_next_charptr++ = NULL;
} else {
data->h.h_addr_list = NULL;
}
if (phost->h_name) {
data->h.h_name = p_next_char;
if (name_len) {
strcpy(p_next_char, phost->h_name);
p_next_char += name_len + 1;
} else {
*p_next_char++ = '\0';
}
} else {
data->h.h_name = NULL;
}
if (phost->h_aliases) {
data->h.h_aliases = p_next_charptr;
for (pcnt = phost->h_aliases, i_alias = 0;
(*pcnt && i_alias < num_addrs);
pcnt++, i_alias++) {
mem_this_alias = strlen(*pcnt) + 1;
required_this_alias = sizeof(phost->h_aliases[0]) +
mem_this_alias;
if (available >= required_this_alias) {
i_alias++;
available -= required_this_alias;
strcpy(p_next_char, *pcnt);
*p_next_charptr++ = p_next_char;
p_next_char += mem_this_alias;
}
p_next_char += sizeof(phost->h_aliases[0]);
}
*p_next_charptr++ = NULL;
} else {
data->h.h_aliases = NULL;
}
curlen = p_next_char - (char *) rehostent;
return curlen;
}
/*
* This chunk of code is used in both win32 and cygwin.
*/
#if defined(_WINDOWS_NSL)
static LYNX_HOSTENT *gbl_phost; /* Pointer to host - See netdb.h */
#if !(defined(__CYGWIN__) && defined(NSL_FORK))
static int donelookup;
static unsigned long __stdcall _fork_func(void *arg)
{
const char *host = (const char *) arg;
static AlignedHOSTENT aligned_full_rehostent;
char *rehostent = (char *) &aligned_full_rehostent;
size_t rehostentlen = 0;
#ifdef SH_EX
unsigned long addr;
addr = (unsigned long) inet_addr(host);
if (addr != INADDR_NONE)
gbl_phost = gethostbyaddr((char *) &addr, sizeof(addr), AF_INET);
else
gbl_phost = gethostbyname(host);
#else
gbl_phost = gethostbyname(host);
#endif
if (gbl_phost) {
rehostentlen = fill_rehostent(rehostent, REHOSTENT_SIZE, gbl_phost);
if (rehostentlen == 0) {
gbl_phost = (LYNX_HOSTENT *) NULL;
} else {
gbl_phost = (LYNX_HOSTENT *) rehostent;
}
}
donelookup = TRUE;
return (unsigned long) (gbl_phost);
}
#endif /* __CYGWIN__ */
#endif /* _WINDOWS_NSL */
#endif /* NSL_FORK */
#ifndef HAVE_H_ERRNO
#undef h_errno
#define h_errno my_errno
static int my_errno;
#else /* we do HAVE_H_ERRNO: */
#ifndef h_errno /* there may be a macro as well as the extern data */
extern int h_errno;
#endif
#endif
/*
* Even though it is a small amount, we cannot count on reading the whole
* struct via a pipe in one read -TD
*/
#ifdef NSL_FORK
static unsigned readit(int fd, char *buffer, unsigned length)
{
unsigned result = 0;
while (length != 0) {
unsigned got = read(fd, buffer, length);
if (got != 0) {
result += got;
buffer += got;
length -= got;
} else {
break;
}
}
return result;
}
#endif /* NSL_FORK */
/* Resolve an internet hostname, like gethostbyname
* ------------------------------------------------
*
* On entry,
* str points to the given host name, not numeric address,
* without colon or port number.
*
* On exit,
* returns a pointer to a LYNX_HOSTENT in static storage,
* or NULL in case of error or user interruption.
*
* The interface is intended to be exactly the same as for (Unix)
* gethostbyname(), except for the following:
*
* If NSL_FORK is not used, the result of gethostbyname is returned
* directly. Otherwise:
* All lists, addresses, and strings referred to by pointers in the
* returned struct are located, together with the returned struct
* itself, in a buffer of size REHOSTENT_SIZE. If not everything fits,
* some info is omitted, but the function is careful to still return
* a valid structure, without truncating strings; it tries to return,
* in order of decreasing priority, the first address (h_addr_list[0]), the
* official name (h_name), the additional addresses, then alias names.
*
* If NULL is returned, the reason is made available in the global
* variable lynx_nsl_status, with one of the following values:
* HT_INTERRUPTED Interrupted by user
* HT_NOT_ACCEPTABLE Hostname detected as invalid
* (also sets h_errno)
* HT_H_ERRNO_VALID An error occurred, and h_errno holds
* an appropriate value
* HT_ERROR Resolver error, reason not known
* HT_INTERNAL Internal error
*/
LYNX_HOSTENT *LYGetHostByName(char *str)
{
char *host = str;
#ifdef NSL_FORK
/* for transfer of result between from child to parent: */
static AlignedHOSTENT aligned_full_rehostent;
/*
* We could define rehosten directly as a static char
* rehostent[REHOSTENT_SIZE], but the indirect approach via the above
* struct should automatically take care of alignment requirements.
* Note that, in addition,
* - this must be static, as we shall return a pointer to it which must
* remain valid, and
* - we have to use the same rehostent in the child process as in the
* parent (its address in the parent's address space must be the same as
* in the child's, otherwise the internal pointers built by the child's
* call to fill_rehostent would be invalid when seen by the parent). -kw
*/
char *rehostent = (char *) &aligned_full_rehostent;
/* for transfer of status from child to parent: */
struct _statuses {
size_t rehostentlen;
int h_length;
int child_errno; /* sometimes useful to pass this on */
int child_h_errno;
BOOL h_errno_valid;
} statuses;
size_t rehostentlen = 0;
#endif /* NSL_FORK */
LYNX_HOSTENT *result_phost = NULL;
#ifdef __DJGPP__
_resolve_hook = ResolveYield;
#endif
if (!str) {
CTRACE((tfp, "LYGetHostByName: Can't parse `NULL'.\n"));
lynx_nsl_status = HT_INTERNAL;
return NULL;
}
CTRACE((tfp, "LYGetHostByName: parsing `%s'.\n", str));
/* Could disable this if all our callers already check - kw */
if (HTCheckForInterrupt()) {
CTRACE((tfp, "LYGetHostByName: INTERRUPTED for '%s'.\n", str));
lynx_nsl_status = HT_INTERRUPTED;
return NULL;
}
if (!valid_hostname(host)) {
lynx_nsl_status = HT_NOT_ACCEPTABLE;
#ifdef NO_RECOVERY
#ifdef _WINDOWS
WSASetLastError(NO_RECOVERY);
#else
h_errno = NO_RECOVERY;
#endif
#endif
return NULL;
}
#ifdef MVS /* Outstanding problem with crash in MVS gethostbyname */
CTRACE((tfp, "LYGetHostByName: Calling gethostbyname(%s)\n", host));
#endif /* MVS */
CTRACE_FLUSH(tfp); /* so child messages will not mess up parent log */
lynx_nsl_status = HT_INTERNAL; /* should be set to something else below */
#ifdef NSL_FORK
statuses.h_errno_valid = NO;
/*
* Start block for fork-based gethostbyname() with checks for interrupts.
* - Tom Zerucha (tz@execpc.com) & FM
*/
{
int got_rehostent = 0;
#if HAVE_SIGACTION
sigset_t old_sigset;
sigset_t new_sigset;
#endif
/*
* Pipe, child pid, status buffers, start time, select() control
* variables.
*/
int fpid, waitret;
int pfd[2], selret, readret;
#ifdef HAVE_TYPE_UNIONWAIT
union wait waitstat;
#else
int waitstat = 0;
#endif
time_t start_time = time((time_t *) 0);
fd_set readfds;
struct timeval one_second;
long dns_patience = 30; /* how many seconds will we wait for DNS? */
int child_exited = 0;
/*
* Reap any children that have terminated since last time through.
* This might include children that we killed, then waited with WNOHANG
* before they were actually ready to be reaped. (Should be max of 1
* in this state, but the loop is safe if waitpid() is implemented
* correctly: returns 0 when children exist but none have exited; -1
* with errno == ECHILD when no children.) -BL
*/
do {
waitret = waitpid(-1, 0, WNOHANG);
} while (waitret > 0 || (waitret == -1 && errno == EINTR));
waitret = 0;
pipe(pfd);
#if HAVE_SIGACTION
/*
* Attempt to prevent a rare situation where the child could execute
* the Lynx signal handlers because it gets killed before it even has a
* chance to reset its handlers, resulting in bogus 'Exiting via
* interrupt' message and screen corruption or worse.
* Should that continue to be reported, for systems without
* sigprocmask(), we need to find a different solutions for those. -
* kw 19990430
*/
sigemptyset(&new_sigset);
sigaddset(&new_sigset, SIGTERM);
sigaddset(&new_sigset, SIGINT);
#ifndef NOSIGHUP
sigaddset(&new_sigset, SIGHUP);
#endif /* NOSIGHUP */
#ifdef SIGTSTP
sigaddset(&new_sigset, SIGTSTP);
#endif /* SIGTSTP */
#ifdef SIGWINCH
sigaddset(&new_sigset, SIGWINCH);
#endif /* SIGWINCH */
sigprocmask(SIG_BLOCK, &new_sigset, &old_sigset);
#endif /* HAVE_SIGACTION */
if ((fpid = fork()) == 0) {
LYNX_HOSTENT *phost; /* Pointer to host - See netdb.h */
/*
* Child - for the long call.
*
* Make sure parent can kill us at will. -BL
*/
(void) signal(SIGTERM, quench);
/*
* Also make sure the child does not run one of the signal handlers
* that may have been installed by Lynx if one of those signals
* occurs. For example we don't want the child to remove temp
* files on ^C, let the parent deal with that. - kw
*/
(void) signal(SIGINT, quench);
#ifndef NOSIGHUP
(void) signal(SIGHUP, quench);
#endif /* NOSIGHUP */
#ifdef SIGTSTP
if (no_suspend)
(void) signal(SIGTSTP, SIG_IGN);
else
(void) signal(SIGTSTP, SIG_DFL);
#endif /* SIGTSTP */
#ifdef SIGWINCH
(void) signal(SIGWINCH, SIG_IGN);
#endif /* SIGWINCH */
#ifndef __linux__
#ifndef DOSPATH
signal(SIGBUS, SIG_DFL);
#endif /* DOSPATH */
#endif /* !__linux__ */
signal(SIGSEGV, SIG_DFL);
signal(SIGILL, SIG_DFL);
#if HAVE_SIGACTION
/* Restore signal mask to whatever it was before the fork. -kw */
sigprocmask(SIG_SETMASK, &old_sigset, NULL);
#endif /* HAVE_SIGACTION */
/*
* Child won't use read side. -BL
*/
close(pfd[0]);
#ifdef HAVE_H_ERRNO
/* to detect cases when it doesn't get set although it should */
h_errno = -2;
#endif
set_errno(0);
phost = gethostbyname(host);
statuses.child_errno = errno;
statuses.child_h_errno = h_errno;
#ifdef HAVE_H_ERRNO
statuses.h_errno_valid = YES;
#endif
#ifdef MVS
CTRACE((tfp, "LYGetHostByName: gethostbyname() returned %d\n", phost));
#endif /* MVS */
#ifdef DEBUG_HOSTENT_CHILD
dump_hostent("CHILD gethostbyname", phost);
#endif
if (OK_HOST(phost)) {
rehostentlen = fill_rehostent(rehostent, REHOSTENT_SIZE, phost);
#ifdef DEBUG_HOSTENT_CHILD
dump_hostent("CHILD fill_rehostent", (LYNX_HOSTENT *) rehostent);
#endif
}
if (rehostentlen <= sizeof(LYNX_HOSTENT) ||
!OK_HOST((LYNX_HOSTENT *) rehostent)) {
rehostentlen = 0;
statuses.h_length = 0;
} else {
statuses.h_length = ((LYNX_HOSTENT *) rehostent)->h_length;
#ifdef HAVE_H_ERRNO
if (h_errno == -2) /* success, but h_errno unchanged? */
statuses.h_errno_valid = NO;
#endif
}
/*
* Send variables indicating status of lookup to parent. That
* includes rehostentlen, which the parent will use as the size for
* the second read (if > 0).
*/
if (!statuses.child_errno)
statuses.child_errno = errno;
statuses.rehostentlen = rehostentlen;
write(pfd[1], &statuses, sizeof(statuses));
if (rehostentlen) {
/*
* Return our resulting rehostent through pipe...
*/
write(pfd[1], rehostent, rehostentlen);
close(pfd[1]);
_exit(0);
} else {
/*
* ... or return error as exit code.
*/
_exit(1);
}
}
#if HAVE_SIGACTION
/*
* (parent) Restore signal mask to whatever it was before the fork. -
* kw
*/
sigprocmask(SIG_SETMASK, &old_sigset, NULL);
#endif /* HAVE_SIGACTION */
/*
* (parent) Wait until lookup finishes, or interrupt, or cycled too
* many times (just in case) -BL
*/
close(pfd[1]); /* parent won't use write side -BL */
if (fpid < 0) { /* fork failed */
close(pfd[0]);
goto failed;
}
while (child_exited || (long) (time((time_t *) 0) - start_time) < dns_patience) {
FD_ZERO(&readfds);
/*
* This allows us to abort immediately, not after 1-second timeout,
* when user hits abort key. Can't do this when using SLANG (or at
* least I don't know how), so SLANG users must live with up-to-1s
* timeout. -BL
*
* Whoops -- we need to make sure stdin is actually selectable!
* /dev/null isn't, on some systems, which makes some useful Lynx
* invocations fail. -BL
*/
{
int kbd_fd = LYConsoleInputFD(TRUE);
if (kbd_fd != INVSOC) {
FD_SET(kbd_fd, &readfds);
}
}
one_second.tv_sec = 1;
one_second.tv_usec = 0;
FD_SET(pfd[0], &readfds);
/*
* Return when data received, interrupted, or failed. If nothing
* is waiting, we sleep for 1 second in select(), to be nice to the
* system. -BL
*/
#ifdef SOCKS
if (socks_flag)
selret = Rselect(pfd[0] + 1, &readfds, NULL, NULL, &one_second);
else
#endif /* SOCKS */
selret = select(pfd[0] + 1, &readfds, NULL, NULL, &one_second);
if ((selret > 0) && FD_ISSET(pfd[0], &readfds)) {
/*
* First get status, including length of address. -BL, kw
*/
readret = readit(pfd[0], (char *) &statuses, sizeof(statuses));
if (readret == sizeof(statuses)) {
h_errno = statuses.child_h_errno;
set_errno(statuses.child_errno);
#ifdef HAVE_H_ERRNO
if (statuses.h_errno_valid) {
lynx_nsl_status = HT_H_ERRNO_VALID;
/*
* If something went wrong in the child process other
* than normal lookup errors, and it appears that we
* have enough info to know what went wrong, generate
* diagnostic output. ENOMEM observed on linux in
* processes constrained with ulimit. It would be too
* unkind to abort the session, access to local files
* or through a proxy may still work. - kw
*/
if (
#ifdef NETDB_INTERNAL /* linux glibc: defined in netdb.h */
(errno && h_errno == NETDB_INTERNAL) ||
#endif
(errno == ENOMEM &&
statuses.rehostentlen == 0 &&
/* should probably be NETDB_INTERNAL if child
memory exhausted, but we may find that
h_errno remains unchanged. - kw */
h_errno == -2)) {
#ifndef MULTINET
HTInetStatus("CHILD gethostbyname");
#endif
HTAlert(LYStrerror(statuses.child_errno));
if (errno == ENOMEM) {
/*
* Not much point in continuing, right? Fake a
* 'z', should shorten pointless guessing
* cycle. - kw
*/
LYFakeZap(YES);
}
}
}
#endif /* HAVE_H_ERRNO */
if (statuses.rehostentlen > sizeof(LYNX_HOSTENT)) {
/*
* Then get the full reorganized hostent. -BL, kw
*/
readret = readit(pfd[0], rehostent, statuses.rehostentlen);
#ifdef DEBUG_HOSTENT
dump_hostent("Read from pipe", (LYNX_HOSTENT *) rehostent);
#endif
if (readret == (int) statuses.rehostentlen) {
got_rehostent = 1;
result_phost = (LYNX_HOSTENT *) rehostent;
lynx_nsl_status = HT_OK;
} else if (!statuses.h_errno_valid) {
lynx_nsl_status = HT_INTERNAL;
}
}
} else {
lynx_nsl_status = HT_ERROR;
}
/*
* Make sure child is cleaned up. -BL
*/
if (!child_exited)
waitret = waitpid(fpid, &waitstat, WNOHANG);
if (!WIFEXITED(waitstat) && !WIFSIGNALED(waitstat)) {
kill(fpid, SIGTERM);
waitret = waitpid(fpid, &waitstat, WNOHANG);
}
break;
}
/*
* Clean up if child exited before & no data received. -BL
*/
if (child_exited) {
waitret = waitpid(fpid, &waitstat, WNOHANG);
break;
}
/*
* If child exited, loop once more looking for data. -BL
*/
if ((waitret = waitpid(fpid, &waitstat, WNOHANG)) > 0) {
/*
* Data will be arriving right now, so make sure we don't
* short-circuit out for too many loops, and skip the interrupt
* check. -BL
*/
child_exited = 1;
continue;
}
/*
* Abort if interrupt key pressed.
*/
if (HTCheckForInterrupt()) {
CTRACE((tfp, "LYGetHostByName: INTERRUPTED gethostbyname.\n"));
kill(fpid, SIGTERM);
waitpid(fpid, NULL, WNOHANG);
close(pfd[0]);
lynx_nsl_status = HT_INTERRUPTED;
return NULL;
}
}
close(pfd[0]);
if (waitret <= 0) {
kill(fpid, SIGTERM);
waitret = waitpid(fpid, &waitstat, WNOHANG);
}
if (waitret > 0) {
if (WIFEXITED(waitstat)) {
CTRACE((tfp,
"LYGetHostByName: NSL_FORK child %d exited, status 0x%x.\n",
(int) waitret, WEXITSTATUS(waitstat)));
} else if (WIFSIGNALED(waitstat)) {
CTRACE((tfp,
"LYGetHostByName: NSL_FORK child %d got signal, status 0x%x!\n",
(int) waitret, WTERMSIG(waitstat)));
#ifdef WCOREDUMP
if (WCOREDUMP(waitstat)) {
CTRACE((tfp,
"LYGetHostByName: NSL_FORK child %d dumped core!\n",
(int) waitret));
}
#endif /* WCOREDUMP */
} else if (WIFSTOPPED(waitstat)) {
CTRACE((tfp,
"LYGetHostByName: NSL_FORK child %d is stopped, status 0x%x!\n",
(int) waitret, WSTOPSIG(waitstat)));
}
}
if (!got_rehostent) {
goto failed;
}
}
#else /* Not NSL_FORK: */
#ifdef _WINDOWS_NSL
{
HANDLE hThread;
DWORD dwThreadID;
#ifndef __CYGWIN__
if (!system_is_NT) { /* for Windows9x */
unsigned long t;
t = (unsigned long) inet_addr(host);
if (t != INADDR_NONE)
gbl_phost = gethostbyaddr((char *) &t, sizeof(t), AF_INET);
else
gbl_phost = gethostbyname(host);
} else { /* for Windows NT */
#endif /* !__CYGWIN__ */
gbl_phost = (LYNX_HOSTENT *) NULL;
donelookup = FALSE;
#if defined(__CYGWIN__) || defined(USE_WINSOCK2_H)
SetLastError(WSAHOST_NOT_FOUND);
#else
WSASetLastError(WSAHOST_NOT_FOUND);
#endif
hThread = CreateThread(NULL, 4096UL, _fork_func, host, 0UL,
&dwThreadID);
if (!hThread)
MessageBox(NULL, "CreateThread",
"CreateThread Failed", 0L);
while (!donelookup) {
if (HTCheckForInterrupt()) {
/* Note that host is a character array and is not freed */
/* to avoid possible subthread problems: */
if (!CloseHandle(hThread)) {
MessageBox((void *) NULL,
"CloseHandle", "CloseHandle Failed", 0L);
}
lynx_nsl_status = HT_INTERRUPTED;
return NULL;
}
}
#ifndef __CYGWIN__
}
#endif /* !__CYGWIN__ */
if (gbl_phost) {
lynx_nsl_status = HT_OK;
result_phost = gbl_phost;
} else {
lynx_nsl_status = HT_ERROR;
goto failed;
}
}
#else /* !NSL_FORK, !_WINDOWS_NSL: */
{
LYNX_HOSTENT *phost;
phost = gethostbyname(host); /* See netdb.h */
#ifdef MVS
CTRACE((tfp, "LYGetHostByName: gethostbyname() returned %d\n", phost));
#endif /* MVS */
if (phost) {
lynx_nsl_status = HT_OK;
result_phost = phost;
} else {
lynx_nsl_status = HT_H_ERRNO_VALID;
goto failed;
}
}
#endif /* !NSL_FORK, !_WINDOWS_NSL */
#endif /* !NSL_FORK */
#ifdef DEBUG_HOSTENT
dump_hostent("End of LYGetHostByName", result_phost);
CTRACE((tfp, "LYGetHostByName: Resolved name to a hostent.\n"));
#endif
return result_phost; /* OK */
failed:
CTRACE((tfp, "LYGetHostByName: Can't find internet node name `%s'.\n",
host));
return NULL;
}
/* Parse a network node address and port
* -------------------------------------
*
* On entry,
* str points to a string with a node name or number,
* with optional trailing colon and port number.
* soc_in points to the binary internet or decnet address field.
*
* On exit,
* *soc_in is filled in. If no port is specified in str, that
* field is left unchanged in *soc_in.
*/
#ifndef INET6
static int HTParseInet(SockA * soc_in, const char *str)
{
char *port;
int dotcount_ip = 0; /* for dotted decimal IP addr */
char *strptr;
char *host = NULL;
if (!str) {
CTRACE((tfp, "HTParseInet: Can't parse `NULL'.\n"));
return -1;
}
CTRACE((tfp, "HTParseInet: parsing `%s'.\n", str));
if (HTCheckForInterrupt()) {
CTRACE((tfp, "HTParseInet: INTERRUPTED for '%s'.\n", str));
return -1;
}
StrAllocCopy(host, str); /* Make a copy we can mutilate */
/*
* Parse port number if present.
*/
if ((port = strchr(host, ':')) != NULL) {
*port++ = 0; /* Chop off port */
strptr = port;
if (port[0] >= '0' && port[0] <= '9') {
#ifdef UNIX
soc_in->sin_port = (PortNumber) htons(strtol(port, &strptr, 10));
#else /* VMS: */
#ifdef DECNET
soc_in->sdn_objnum = (unsigned char) (strtol(port, &strptr, 10));
#else
soc_in->sin_port = htons((PortNumber) strtol(port, &strptr, 10));
#endif /* Decnet */
#endif /* Unix vs. VMS */
#ifdef SUPPRESS /* 1. crashes!?!. 2. URL syntax has number not name */
} else {
struct servent *serv = getservbyname(port, (char *) 0);
if (serv) {
soc_in->sin_port = serv->s_port;
} else {
CTRACE((tfp, "TCP: Unknown service %s\n", port));
}
#endif /* SUPPRESS */
}
if (strptr && *strptr != '\0') {
FREE(host);
HTAlwaysAlert(NULL, gettext("Address has invalid port"));
return -1;
}
}
#ifdef DECNET
/*
* Read Decnet node name. @@ Should know about DECnet addresses, but it's
* probably worth waiting until the Phase transition from IV to V.
*/
soc_in->sdn_nam.n_len = min(DN_MAXNAML, strlen(host)); /* <=6 in phase 4 */
strncpy(soc_in->sdn_nam.n_name, host, soc_in->sdn_nam.n_len + 1);
CTRACE((tfp,
"DECnet: Parsed address as object number %d on host %.6s...\n",
soc_in->sdn_objnum, host));
#else /* parse Internet host: */
if (*host >= '0' && *host <= '9') { /* Test for numeric node address: */
strptr = host;
while (*strptr) {
if (*strptr == '.') {
dotcount_ip++;
} else if (!isdigit(UCH(*strptr))) {
break;
}
strptr++;
}
if (*strptr) { /* found non-numeric, assume domain name */
dotcount_ip = 0;
}
}
/*
* Parse host number if present.
*/
if (dotcount_ip == 3) /* Numeric node address: */
{
#ifdef DGUX_OLD
soc_in->sin_addr.s_addr = inet_addr(host).s_addr; /* See arpa/inet.h */
#else
#ifdef GUSI
soc_in->sin_addr = inet_addr(host); /* See netinet/in.h */
#else
#ifdef HAVE_INET_ATON
if (!inet_aton(host, &(soc_in->sin_addr))) {
CTRACE((tfp, "inet_aton(%s) returns error\n", host));
FREE(host);
return -1;
}
#else
soc_in->sin_addr.s_addr = inet_addr(host); /* See arpa/inet.h */
#endif /* HAVE_INET_ATON */
#endif /* GUSI */
#endif /* DGUX_OLD */
FREE(host);
} else { /* Alphanumeric node name: */
#ifdef MVS /* Outstanding problem with crash in MVS gethostbyname */
CTRACE((tfp, "HTParseInet: Calling LYGetHostByName(%s)\n", host));
#endif /* MVS */
#ifdef _WINDOWS_NSL
gbl_phost = LYGetHostByName(host); /* See above */
if (!gbl_phost)
goto failed;
memcpy((void *) &soc_in->sin_addr, gbl_phost->h_addr_list[0], gbl_phost->h_length);
#else /* !_WINDOWS_NSL */
{
LYNX_HOSTENT *phost;
phost = LYGetHostByName(host); /* See above */
if (!phost)
goto failed;
if (!phost)
goto failed;
if (phost->h_length != sizeof soc_in->sin_addr) {
HTAlwaysAlert(host, gettext("Address length looks invalid"));
}
memcpy((void *) &soc_in->sin_addr, phost->h_addr_list[0], phost->h_length);
}
#endif /* _WINDOWS_NSL */
FREE(host);
} /* Alphanumeric node name */
CTRACE((tfp,
"HTParseInet: Parsed address as port %d, IP address %d.%d.%d.%d\n",
(int) ntohs(soc_in->sin_port),
(int) *((unsigned char *) (&soc_in->sin_addr) + 0),
(int) *((unsigned char *) (&soc_in->sin_addr) + 1),
(int) *((unsigned char *) (&soc_in->sin_addr) + 2),
(int) *((unsigned char *) (&soc_in->sin_addr) + 3)));
#endif /* Internet vs. Decnet */
return 0; /* OK */
failed:
CTRACE((tfp, "HTParseInet: Can't find internet node name `%s'.\n",
host));
FREE(host);
switch (lynx_nsl_status) {
case HT_NOT_ACCEPTABLE:
case HT_INTERRUPTED:
return lynx_nsl_status;
default:
return -1;
}
}
#endif /* !INET6 */
#ifdef INET6
static LYNX_ADDRINFO *HTGetAddrInfo(const char *str,
const int defport)
{
LYNX_ADDRINFO hints, *res;
int error;
char *p;
char *s = NULL;
char *host, *port;
char pbuf[80];
StrAllocCopy(s, str);
if (s[0] == '[' && (p = strchr(s, ']')) != NULL) {
*p++ = '\0';
host = s + 1;
} else {
p = s;
host = &s[0];
}
port = strrchr(p, ':');
if (port) {
*port++ = '\0';
} else {
sprintf(pbuf, "%d", defport);
port = pbuf;
}
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
error = getaddrinfo(host, port, &hints, &res);
if (error || !res) {
CTRACE((tfp, "HTGetAddrInfo: getaddrinfo(%s, %s): %s\n", host, port,
gai_strerror(error)));
res = NULL;
}
free(s);
return res;
}
#endif /* INET6 */
#ifdef LY_FIND_LEAKS
/* Free our name for the host on which we are - FM
* -------------------------------------------
*
*/
static void free_HTTCP_hostname(void)
{
FREE(hostname);
}
#endif /* LY_FIND_LEAKS */
/* Derive the name of the host on which we are
* -------------------------------------------
*
*/
static void get_host_details(void)
{
char name[MAXHOSTNAMELEN + 1]; /* The name of this host */
#ifdef UCX
char *domain_name; /* The name of this host domain */
#endif /* UCX */
#ifdef NEED_HOST_ADDRESS /* no -- needs name server! */
#ifdef INET6
LYNX_ADDRINFO hints, *res;
int error;
#else
LYNX_HOSTENT *phost; /* Pointer to host -- See netdb.h */
#endif /* INET6 */
#endif /* NEED_HOST_ADDRESS */
int namelength = sizeof(name);
if (hostname)
return; /* Already done */
gethostname(name, namelength); /* Without domain */
StrAllocCopy(hostname, name);
#ifdef LY_FIND_LEAKS
atexit(free_HTTCP_hostname);
#endif
#ifdef UCX
/*
* UCX doesn't give the complete domain name. Get rest from UCX$BIND_DOM
* logical.
*/
if (strchr(hostname, '.') == NULL) { /* Not full address */
domain_name = LYGetEnv("UCX$BIND_DOMAIN");
if (domain_name == NULL)
domain_name = LYGetEnv("TCPIP$BIND_DOMAIN");
if (domain_name != NULL) {
StrAllocCat(hostname, ".");
StrAllocCat(hostname, domain_name);
}
}
#endif /* UCX */
CTRACE((tfp, "TCP: Local host name is %s\n", hostname));
#ifndef DECNET /* Decnet ain't got no damn name server 8#OO */
#ifdef NEED_HOST_ADDRESS /* no -- needs name server! */
#ifdef INET6
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_CANONNAME;
error = getaddrinfo(name, NULL, &hints, &res);
if (error || !res || !res->ai_canonname) {
CTRACE((tfp, "TCP: %s: `%s'\n", gai_strerror(error), name));
if (res)
freeaddrinfo(res);
return; /* Fail! */
}
StrAllocCopy(hostname, res->ai_canonname);
memcpy(&HTHostAddress, res->ai_addr, res->ai_addrlen);
freeaddrinfo(res);
#else
phost = gethostbyname(name); /* See netdb.h */
if (!OK_HOST(phost)) {
CTRACE((tfp,
"TCP: Can't find my own internet node address for `%s'!!\n",
name));
return; /* Fail! */
}
StrAllocCopy(hostname, phost->h_name);
memcpy(&HTHostAddress, &phost->h_addr_list[0], phost->h_length);
#endif /* INET6 */
CTRACE((tfp, " Name server says that I am `%s' = %s\n",
hostname, HTInetString(&HTHostAddress)));
#endif /* NEED_HOST_ADDRESS */
#endif /* !DECNET */
}
const char *HTHostName(void)
{
get_host_details();
return hostname;
}
#ifdef _WINDOWS
#define SET_EINTR WSASetLastError(EINTR)
#else
#define SET_EINTR SOCKET_ERRNO = EINTR
#endif
static BOOL HTWasInterrupted(int *status)
{
BOOL result = FALSE;
if (HTCheckForInterrupt()) {
result = TRUE;
*status = HT_INTERRUPTED;
SET_EINTR;
}
return result;
}
#ifndef MULTINET /* SOCKET_ERRNO != errno ? */
#if !defined(UCX) || !defined(VAXC) /* errno not modifiable ? */
#define SOCKET_DEBUG_TRACE /* show errno status after some system calls */
#endif /* UCX && VAXC */
#endif /* MULTINET */
/*
* Interruptible connect as implemented for Mosaic by Marc Andreesen
* and hacked in for Lynx years ago by Lou Montulli, and further
* modified over the years by numerous Lynx lovers. - FM
*/
int HTDoConnect(const char *url,
const char *protocol,
int default_port,
int *s)
{
int status = 0;
char *line = NULL;
char *p1 = NULL;
char *at_sign = NULL;
char *host = NULL;
#ifdef INET6
LYNX_ADDRINFO *res = 0, *res0 = 0;
#else
struct sockaddr_in soc_address;
struct sockaddr_in *soc_in = &soc_address;
/*
* Set up defaults.
*/
memset(soc_in, 0, sizeof(*soc_in));
soc_in->sin_family = AF_INET;
soc_in->sin_port = htons((PortNumber) default_port);
#endif /* INET6 */
/*
* Get node name and optional port number.
*/
p1 = HTParse(url, "", PARSE_HOST);
if ((at_sign = strchr(p1, '@')) != NULL) {
/*
* If there's an @ then use the stuff after it as a hostname.
*/
StrAllocCopy(host, (at_sign + 1));
} else {
StrAllocCopy(host, p1);
}
FREE(p1);
HTSprintf0(&line, "%s%s", WWW_FIND_MESSAGE, host);
_HTProgress(line);
#ifdef INET6
/* HTParseInet() is useless! */
res0 = HTGetAddrInfo(host, default_port);
if (res0 == NULL) {
HTSprintf0(&line, gettext("Unable to locate remote host %s."), host);
_HTProgress(line);
FREE(host);
FREE(line);
return HT_NO_DATA;
}
#else
status = HTParseInet(soc_in, host);
if (status) {
if (status != HT_INTERRUPTED) {
if (status == HT_NOT_ACCEPTABLE) {
/* Not HTProgress, so warning won't be overwritten immediately;
* but not HTAlert, because typically there will be other
* alerts from the callers. - kw
*/
HTUserMsg2(gettext("Invalid hostname %s"), host);
} else {
HTSprintf0(&line,
gettext("Unable to locate remote host %s."), host);
_HTProgress(line);
}
status = HT_NO_DATA;
}
FREE(host);
FREE(line);
return status;
}
#endif /* INET6 */
HTSprintf0(&line, gettext("Making %s connection to %s"), protocol, host);
_HTProgress(line);
FREE(host);
FREE(line);
/*
* Now, let's get a socket set up from the server for the data.
*/
#ifndef INET6
*s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (*s == -1) {
HTAlert(gettext("socket failed."));
return HT_NO_DATA;
}
#else
for (res = res0; res; res = res->ai_next) {
*s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (*s == -1) {
char hostbuf[1024], portbuf[1024];
getnameinfo(res->ai_addr, res->ai_addrlen,
hostbuf, sizeof(hostbuf), portbuf, sizeof(portbuf),
NI_NUMERICHOST | NI_NUMERICSERV);
HTSprintf0(&line,
gettext("socket failed: family %d addr %s port %s."),
res->ai_family, hostbuf, portbuf);
_HTProgress(line);
FREE(line);
continue;
}
#endif /* INET6 */
#if !defined(DOSPATH) || defined(__DJGPP__)
#if !defined(NO_IOCTL) || defined(USE_FCNTL)
/*
* Make the socket non-blocking, so the connect can be canceled. This
* means that when we issue the connect we should NOT have to wait for
* the accept on the other end.
*/
{
#ifdef USE_FCNTL
int ret = fcntl(*s, F_SETFL, O_NONBLOCK);
#else
int val = 1;
int ret = IOCTL(*s, FIONBIO, &val);
#endif /* USE_FCNTL */
if (ret == -1)
_HTProgress(gettext("Could not make connection non-blocking."));
}
#endif /* !NO_IOCTL || USE_FCNTL */
#endif /* !DOSPATH || __DJGPP__ */
/*
* Issue the connect. Since the server can't do an instantaneous
* accept and we are non-blocking, this will almost certainly return a
* negative status.
*/
#ifdef SOCKS
if (socks_flag) {
#ifdef INET6
status = Rconnect(*s, res->ai_addr, res->ai_addrlen);
#else
status = Rconnect(*s, (struct sockaddr *) &soc_address,
sizeof(soc_address));
#ifndef SHORTENED_RBIND
socks_bind_remoteAddr = soc_address.sin_addr.s_addr;
#endif
#endif /* INET6 */
} else
#endif /* SOCKS */
#ifdef INET6
status = connect(*s, res->ai_addr, res->ai_addrlen);
#else
status = connect(*s, (struct sockaddr *) &soc_address, sizeof(soc_address));
#endif /* INET6 */
/*
* According to the Sun man page for connect:
* EINPROGRESS The socket is non-blocking and the con-
* nection cannot be completed immediately.
* It is possible to select(2) for comple-
* tion by selecting the socket for writ-
* ing.
* According to the Motorola SVR4 man page for connect:
* EAGAIN The socket is non-blocking and the con-
* nection cannot be completed immediately.
* It is possible to select for completion
* by selecting the socket for writing.
* However, this is only possible if the
* socket STREAMS module is the topmost
* module on the protocol stack with a
* write service procedure. This will be
* the normal case.
*/
if ((status < 0) &&
(SOCKET_ERRNO == EINPROGRESS
#ifdef EAGAIN
|| SOCKET_ERRNO == EAGAIN
#endif
)) {
struct timeval select_timeout;
int ret;
int tries = 0;
#ifdef SOCKET_DEBUG_TRACE
HTInetStatus("this socket's first connect");
#endif /* SOCKET_DEBUG_TRACE */
ret = 0;
while (ret <= 0) {
fd_set writefds;
/*
* Protect against an infinite loop.
*/
if ((tries++ / 10) >= connect_timeout) {
HTAlert(gettext("Connection failed (too many retries)."));
#ifdef INET6
FREE(line);
if (res0)
freeaddrinfo(res0);
#endif /* INET6 */
return HT_NO_DATA;
}
#ifdef _WINDOWS_NSL
select_timeout.tv_sec = connect_timeout;
select_timeout.tv_usec = 0;
#else
select_timeout.tv_sec = 0;
select_timeout.tv_usec = 100000;
#endif /* _WINDOWS_NSL */
FD_ZERO(&writefds);
FD_SET((unsigned) *s, &writefds);
#ifdef SOCKS
if (socks_flag)
ret = Rselect((unsigned) *s + 1, NULL,
&writefds, NULL, &select_timeout);
else
#endif /* SOCKS */
ret = select((unsigned) *s + 1,
NULL,
&writefds,
NULL,
&select_timeout);
#ifdef SOCKET_DEBUG_TRACE
if (tries == 1) {
HTInetStatus("this socket's first select");
}
#endif /* SOCKET_DEBUG_TRACE */
/*
* If we suspend, then it is possible that select will be
* interrupted. Allow for this possibility. - JED
*/
if ((ret == -1) && (errno == EINTR))
continue;
#ifdef SOCKET_DEBUG_TRACE
if (ret < 0) {
HTInetStatus("failed select");
}
#endif /* SOCKET_DEBUG_TRACE */
/*
* Again according to the Sun and Motorola man pages for
* connect:
* EALREADY The socket is non-blocking and a previ-
* ous connection attempt has not yet been
* completed.
* Thus if the SOCKET_ERRNO is NOT EALREADY we have a real
* error, and should break out here and return that error.
* Otherwise if it is EALREADY keep on trying to complete the
* connection.
*/
if ((ret < 0) && (SOCKET_ERRNO != EALREADY)) {
status = ret;
break;
} else if (ret > 0) {
/*
* Extra check here for connection success, if we try to
* connect again, and get EISCONN, it means we have a
* successful connection. But don't check with SOCKS.
*/
#ifdef SOCKS
if (socks_flag) {
status = 0;
} else {
#endif /* SOCKS */
#ifdef INET6
status = connect(*s, res->ai_addr, res->ai_addrlen);
#else
status = connect(*s, (struct sockaddr *) &soc_address,
sizeof(soc_address));
#endif /* INET6 */
#ifdef UCX
/*
* A UCX feature: Instead of returning EISCONN UCX
* returns EADDRINUSE. Test for this status also.
*/
if ((status < 0) && ((SOCKET_ERRNO == EISCONN) ||
(SOCKET_ERRNO == EADDRINUSE)))
#else
if ((status < 0) && (SOCKET_ERRNO == EISCONN))
#endif /* UCX */
{
status = 0;
}
if (status && (SOCKET_ERRNO == EALREADY)) /* new stuff LJM */
ret = 0; /* keep going */
else {
#ifdef SOCKET_DEBUG_TRACE
if (status < 0) {
HTInetStatus("confirm-ready connect");
}
#endif /* SOCKET_DEBUG_TRACE */
break;
}
#ifdef SOCKS
}
#endif /* SOCKS */
}
#ifdef SOCKS
else if (!socks_flag)
#else
else
#endif /* SOCKS */
{
/*
* The select says we aren't ready yet. Try to connect
* again to make sure. If we don't get EALREADY or
* EISCONN, something has gone wrong. Break out and report
* it.
*
* For some reason, SVR4 returns EAGAIN here instead of
* EALREADY, even though the man page says it should be
* EALREADY.
*
* For some reason, UCX pre 3 apparently returns errno =
* 18242 instead of EALREADY or EISCONN.
*/
#ifdef INET6
status = connect(*s, res->ai_addr, res->ai_addrlen);
#else
status = connect(*s, (struct sockaddr *) &soc_address,
sizeof(soc_address));
#endif /* INET6 */
if ((status < 0) &&
(SOCKET_ERRNO != EALREADY
#ifdef EAGAIN
&& SOCKET_ERRNO != EAGAIN
#endif
) &&
#ifdef UCX
(SOCKET_ERRNO != 18242) &&
#endif /* UCX */
(SOCKET_ERRNO != EISCONN)) {
#ifdef SOCKET_DEBUG_TRACE
HTInetStatus("confirm-not-ready connect");
#endif /* SOCKET_DEBUG_TRACE */
break;
}
}
if (HTWasInterrupted(&status)) {
CTRACE((tfp, "*** INTERRUPTED in middle of connect.\n"));
break;
}
}
}
#ifdef SOCKET_DEBUG_TRACE
else if (status < 0) {
HTInetStatus("this socket's first and only connect");
}
#endif /* SOCKET_DEBUG_TRACE */
#ifdef INET6
if (status < 0) {
NETCLOSE(*s);
*s = -1;
continue;
}
break;
}
#endif /* INET6 */
#ifdef INET6
if (*s < 0)
#else
if (status < 0)
#endif /* INET6 */
{
/*
* The connect attempt failed or was interrupted, so close up the
* socket.
*/
NETCLOSE(*s);
}
#if !defined(DOSPATH) || defined(__DJGPP__)
#if !defined(NO_IOCTL) || defined(USE_FCNTL)
else {
/*
* Make the socket blocking again on good connect.
*/
#ifdef USE_FCNTL
int ret = fcntl(*s, F_SETFL, 0);
#else
int val = 0;
int ret = IOCTL(*s, FIONBIO, &val);
#endif /* USE_FCNTL */
if (ret == -1)
_HTProgress(gettext("Could not restore socket to blocking."));
}
#endif /* !NO_IOCTL || USE_FCNTL */
#endif /* !DOSPATH || __DJGPP__ */
#ifdef INET6
FREE(line);
if (res0)
freeaddrinfo(res0);
#endif /* INET6 */
return status;
}
/*
* This is so interruptible reads can be implemented cleanly.
*/
int HTDoRead(int fildes,
void *buf,
unsigned nbyte)
{
int result;
BOOL ready;
#if !defined(NO_IOCTL)
int ret;
fd_set readfds;
struct timeval select_timeout;
int tries = 0;
#ifdef USE_READPROGRESS
int otries = 0;
time_t otime = time((time_t *) 0);
time_t start = otime;
#endif
#endif /* !NO_IOCTL */
#if defined(UNIX) && !defined(__BEOS__)
if (fildes == 0) {
/*
* 0 can be a valid socket fd, but if it's a tty something must have
* gone wrong. - kw
*/
if (isatty(fildes)) {
CTRACE((tfp, "HTDoRead - refusing to read fd 0 which is a tty!\n"));
return -1;
}
} else
#endif
if (fildes <= 0) {
CTRACE((tfp, "HTDoRead - no file descriptor!\n"));
return -1;
}
if (HTWasInterrupted(&result)) {
CTRACE((tfp, "HTDoRead - interrupted before starting!\n"));
return (result);
}
#if defined(NO_IOCTL)
ready = TRUE;
#else
ready = FALSE;
while (!ready) {
/*
* Protect against an infinite loop.
*/
if (tries++ >= 180000) {
HTAlert(gettext("Socket read failed for 180,000 tries."));
SET_EINTR;
result = HT_INTERRUPTED;
break;
}
#ifdef USE_READPROGRESS
if (tries - otries > 10) {
time_t t = time((time_t *) 0);
otries = tries;
if (t - otime >= 5) {
otime = t;
HTReadProgress(-1, 0); /* Put "stalled" message */
}
}
#endif
/*
* If we suspend, then it is possible that select will be interrupted.
* Allow for this possibility. - JED
*/
do {
select_timeout.tv_sec = 0;
select_timeout.tv_usec = 100000;
FD_ZERO(&readfds);
FD_SET((unsigned) fildes, &readfds);
#ifdef SOCKS
if (socks_flag)
ret = Rselect((unsigned) fildes + 1,
&readfds, NULL, NULL, &select_timeout);
else
#endif /* SOCKS */
ret = select((unsigned) fildes + 1,
&readfds, NULL, NULL, &select_timeout);
} while ((ret == -1) && (errno == EINTR));
if (ret < 0) {
result = -1;
break;
} else if (ret > 0) {
ready = TRUE;
} else if (HTWasInterrupted(&result)) {
break;
}
}
#endif /* !NO_IOCTL */
if (ready) {
#if defined(UCX) && defined(VAXC)
/*
* VAXC and UCX problem only.
*/
errno = vaxc$errno = 0;
result = SOCKET_READ(fildes, buf, nbyte);
CTRACE((tfp,
"Read - result,errno,vaxc$errno: %d %d %d\n", result, errno, vaxc$errno));
if ((result <= 0) && TRACE)
perror("HTTCP.C:HTDoRead:read"); /* RJF */
/*
* An errno value of EPIPE and result < 0 indicates end-of-file on VAXC.
*/
if ((result <= 0) && (errno == EPIPE)) {
result = 0;
set_errno(0);
}
#else
#ifdef UNIX
while ((result = SOCKET_READ(fildes, buf, nbyte)) == -1) {
if (errno == EINTR)
continue;
#ifdef ERESTARTSYS
if (errno == ERESTARTSYS)
continue;
#endif /* ERESTARTSYS */
HTInetStatus("read");
break;
}
#else /* UNIX */
result = SOCKET_READ(fildes, buf, nbyte);
#endif /* !UNIX */
#endif /* UCX && VAXC */
}
#ifdef USE_READPROGRESS
CTRACE2(TRACE_TIMING, (tfp, "...HTDoRead returns %d (%ld seconds)\n",
result, (long) (time((time_t *) 0) - start)));
#endif
return result;
}
#ifdef SVR4_BSDSELECT
/*
* This is a fix for the difference between BSD's select() and
* SVR4's select(). SVR4's select() can never return a value larger
* than the total number of file descriptors being checked. So, if
* you select for read and write on one file descriptor, and both
* are true, SVR4 select() will only return 1. BSD select in the
* same situation will return 2.
*
* Additionally, BSD select() on timing out, will zero the masks,
* while SVR4 does not. This is fixed here as well.
*
* Set your tabstops to 4 characters to have this code nicely formatted.
*
* Jerry Whelan, guru@bradley.edu, June 12th, 1993
*/
#ifdef select
#undef select
#endif /* select */
#ifdef SOCKS
#ifdef Rselect
#undef Rselect
#endif /* Rselect */
#endif /* SOCKS */
#include <sys/types.h>
#include <sys/time.h>
#include <sys/select.h>
int BSDselect(int nfds,
fd_set * readfds,
fd_set * writefds,
fd_set * exceptfds,
struct timeval *select_timeout)
{
int rval, i;
#ifdef SOCKS
if (socks_flag)
rval = Rselect(nfds, readfds, writefds, exceptfds, select_timeout);
else
#endif /* SOCKS */
rval = select(nfds, readfds, writefds, exceptfds, select_timeout);
switch (rval) {
case -1:
return (rval);
case 0:
if (readfds != NULL)
FD_ZERO(readfds);
if (writefds != NULL)
FD_ZERO(writefds);
if (exceptfds != NULL)
FD_ZERO(exceptfds);
return (rval);
default:
for (i = 0, rval = 0; i < nfds; i++) {
if ((readfds != NULL) && FD_ISSET(i, readfds))
rval++;
if ((writefds != NULL) && FD_ISSET(i, writefds))
rval++;
if ((exceptfds != NULL) && FD_ISSET(i, exceptfds))
rval++;
}
return (rval);
}
/* Should never get here */
}
#endif /* SVR4_BSDSELECT */