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|
/* 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 <sys/wait.h>
#endif /* NSL_FORK */
#ifdef HAVE_RESOLV_H
#include <resolv.h>
#endif
#define OK_HOST(p) ((p) != 0 && ((p)->h_length) != 0)
#ifdef SVR4_BSDSELECT
PUBLIC int BSDselect PARAMS((
int nfds,
fd_set * readfds,
fd_set * writefds,
fd_set * exceptfds,
struct timeval * 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>
#ifndef FD_SETSIZE
#if defined(UCX) || defined(SOCKETSHR_TCP) || defined(CMU_TCP)
#define FD_SETSIZE 32
#else
#define FD_SETSIZE 256
#endif /* Limit # sockets to 32 for UCX, BSN - also SOCKETSHR and CMU, AH */
#endif /* FD_SETSIZE */
/*
** Module-Wide variables
*/
PRIVATE char *hostname = NULL; /* The name of this host */
/*
** PUBLIC VARIABLES
*/
#ifdef SOCKS
extern BOOLEAN socks_flag;
PUBLIC 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.
*/
#ifndef PCNFS
#ifdef VMS
#include <perror.h>
#ifndef errno
extern int errno;
#endif /* !errno */
#endif /* VMS */
#ifndef VM
#ifndef VMS
#ifndef THINK_C
#ifdef DECL_SYS_ERRLIST
extern char *sys_errlist[]; /* see man perror on cernvax */
extern int sys_nerr;
#endif /* DECL_SYS_ERRLIST */
#endif /* !THINK_C */
#endif /* !VMS */
#endif /* !VM */
#endif /* !PCNFS */
#ifdef _WINDOWS_NSL
char host[512];
struct hostent *phost; /* Pointer to host - See netdb.h */
int donelookup;
unsigned long _fork_func (void *arglist)
{
#ifdef SH_EX
unsigned long addr;
addr = (unsigned long)inet_addr(host);
if ((int)addr != -1)
phost = gethostbyaddr((char *)&addr, sizeof (addr), AF_INET);
else
phost = gethostbyname(host);
#else
phost = gethostbyname(host);
#endif
donelookup = TRUE;
return (unsigned long)(phost);
}
#endif /* _WINDOWS_NSL */
#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 <iodef.h>
#define IOC_OUT (int)0x40000000
extern int vaxc$get_sdc(), sys$qiow();
PUBLIC int HTioctl ARGS3(
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$get_sdc (d)) == 0) {
errno = EBADF;
return -1;
}
ioctl_desc.opt = UCX$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$qiow (0, sdc, fun, iosb, 0, 0, 0, 0, 0, 0, p5, p6);
if (!(status & 01)) {
errno = status;
return -1;
}
if (!(iosb[0] & 01)) {
errno = iosb[0];
return -1;
}
return 0;
}
#endif /* VMS && UCX */
/* Report Internet Error
** ---------------------
*/
PUBLIC int HTInetStatus ARGS1(
char *, where)
{
#ifdef VMS
#ifdef MULTINET
SOCKET_ERRNO = vmserrno;
#endif /* MULTINET */
#endif /* VMS */
CTRACE(tfp,
"TCP: Error %d in `SOCKET_ERRNO' after call to %s() failed.\n\t%s\n",
SOCKET_ERRNO, where,
/* third arg is transport/platform specific */
#ifdef VM
"(Error number not translated)"); /* What Is the VM equiv? */
#define ER_NO_TRANS_DONE
#endif /* VM */
#ifdef VMS
#ifdef MULTINET
vms_errno_string());
#else
((SOCKET_ERRNO > 0 && SOCKET_ERRNO <= 65) ?
strerror(SOCKET_ERRNO) : "(Error number not translated)"));
#endif /* MULTINET */
#define ER_NO_TRANS_DONE
#endif /* VMS */
#ifdef HAVE_STRERROR
strerror(SOCKET_ERRNO));
#define ER_NO_TRANS_DONE
#endif /* HAVE_STRERROR */
#ifndef ER_NO_TRANS_DONE
(SOCKET_ERRNO < sys_nerr ?
sys_errlist[SOCKET_ERRNO] : "Unknown error" ));
#endif /* !ER_NO_TRANS_DONE */
#ifdef VMS
#ifndef MULTINET
CTRACE(tfp,
" Unix error number (SOCKET_ERRNO) = %ld dec\n",
SOCKET_ERRNO);
CTRACE(tfp,
" VMS error (vaxc$errno) = %lx hex\n",
vaxc$errno);
#endif /* MULTINET */
#endif /* VMS */
#ifdef VMS
/*
** uerrno and errno happen to be zero if vmserrno <> 0
*/
#ifdef MULTINET
return -vmserrno;
#else
return -vaxc$errno;
#endif /* MULTINET */
#else
return -SOCKET_ERRNO;
#endif /* VMS */
}
/* 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
*/
PUBLIC unsigned int HTCardinal ARGS3(
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.
*/
PUBLIC CONST char * HTInetString ARGS1(
SockA*, soc_in)
{
static char string[16];
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 /* !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,
** - 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.
*/
PUBLIC BOOL valid_hostname ARGS1(
CONST char *, name)
{
int i=1, iseg = 0;
CONST 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 > 63) {
return NO;
}
if (!isalnum((unsigned char)*cp) &&
*cp != '-' && *cp != '_' &&
*cp != '$' && *cp != '+') {
return NO;
}
}
return (*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
*/
PRIVATE void quench ARGS1(
int, sig GCC_UNUSED)
{
_exit(2);
}
#endif /* NSL_FORK */
PUBLIC int lynx_nsl_status = HT_OK;
#ifndef DJGPP /* much excluded! */
#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 struct hostent.
**
** dump_hostent - dumps the contents of a struct hostent to the
** trace log or stderr, including all pointer values, strings, and
** addresses, in a format inspired by gdb's print format. - kw
*/
PRIVATE void dump_hostent ARGS2(
CONST char *, msgprefix,
CONST struct 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 struct 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 struct hostent. - kw
** See also description of LYGetHostByName.
*/
PRIVATE size_t fill_rehostent ARGS3(
char *, rehostent,
size_t, rehostentsize,
CONST struct hostent *, phost)
{
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(struct 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;
}
}
}
((struct hostent *)rehostent)->h_addrtype = phost->h_addrtype;
((struct hostent *)rehostent)->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) {
((struct hostent *)rehostent)->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 {
((struct hostent *)rehostent)->h_addr_list = NULL;
}
if (phost->h_name) {
((struct hostent *)rehostent)->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 {
((struct hostent *)rehostent)->h_name = NULL;
}
if (phost->h_aliases) {
((struct hostent *)rehostent)->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 {
((struct hostent *)rehostent)->h_aliases = NULL;
}
curlen = p_next_char - (char *)rehostent;
return curlen;
}
#define REHOSTENT_SIZE 128 /* not bigger than pipe buffer! */
#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
/* 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 struct 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), 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
*/
PUBLIC struct hostent * LYGetHostByName ARGS1(
CONST char *, str)
{
#ifndef _WINDOWS_NSL
CONST char *host = str;
#endif /* _WINDOWS_NSL */
#ifdef NSL_FORK
/* for transfer of result between from child to parent: */
static struct {
struct hostent h;
char rest[REHOSTENT_SIZE];
} 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 */
struct hostent *result_phost = NULL;
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 _WINDOWS_NSL
strncpy(host, str, (size_t)512);
#else
host = str;
#endif /* _WINDOWS_NSL */
#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.
*/
pid_t fpid, waitret;
int pfd[2], selret, readret, waitstat = 0;
time_t start_time = time(NULL);
fd_set readfds;
struct timeval timeout;
int 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 ) {
struct 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
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", (struct hostent *)rehostent);
#endif
}
if (rehostentlen <= sizeof(struct hostent) ||
!OK_HOST((struct hostent *)rehostent)) {
rehostentlen = 0;
statuses.h_length = 0;
} else {
statuses.h_length = ((struct 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);
_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 || time(NULL) - 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);
}
}
timeout.tv_sec = 1;
timeout.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, (void *)&readfds, NULL, NULL, &timeout);
else
#endif /* SOCKS */
selret = select(pfd[0] + 1, (void *)&readfds, NULL, NULL, &timeout);
if ((selret > 0) && FD_ISSET(pfd[0], &readfds)) {
/*
** First get status, including length of address. -BL, kw
*/
readret = read(pfd[0], &statuses, sizeof(statuses));
if (readret == sizeof(statuses)) {
h_errno = statuses.child_h_errno;
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(struct hostent)) {
/*
** Then get the full reorganized hostent. -BL, kw
*/
readret = read(pfd[0], rehostent, statuses.rehostentlen);
#ifdef DEBUG_HOSTENT
dump_hostent("Read from pipe", (struct hostent *)rehostent);
#endif
if (readret == (int) statuses.rehostentlen) {
got_rehostent = 1;
result_phost = (struct 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, waitstat);
} else if (WIFSIGNALED(waitstat)) {
CTRACE(tfp, "LYGetHostByName: NSL_FORK child %d got signal, status 0x%x!\n",
(int)waitret, 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, waitstat);
}
}
if (!got_rehostent) {
goto failed;
}
}
#else /* Not NSL_FORK: */
#ifdef _WINDOWS_NSL
{
char buff[256];
LPSTR szIPAddr; /* IP address as a dotted decimal string */
IN_ADDR addr;
IN_ADDR *p;
HANDLE hThread, dwThreadID;
if (!system_is_NT) { /* for Windows9x */
unsigned long t;
t = (unsigned long)inet_addr((char *)host);
if ((int)t != -1)
phost = gethostbyaddr((char *)&t, sizeof (t), AF_INET);
else
phost = gethostbyname((char *)host);
} else { /* for Windows NT */
phost = (struct hostent *) NULL;
hThread = CreateThread((void *)NULL, 4096UL,
(LPTHREAD_START_ROUTINE)_fork_func,
(void *)NULL, 0UL, (unsigned long *)&dwThreadID);
if (!hThread)
MessageBox((void *)NULL, "CreateThread",
"CreateThread Failed", 0L);
donelookup = FALSE;
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;
}
}
}
if (phost) {
lynx_nsl_status = HT_OK;
result_phost = phost;
} else {
lynx_nsl_status = HT_ERROR;
goto failed;
}
}
#else /* !NSL_FORK, !_WINDOWS_NSL: */
{
struct hostent *phost;
phost = gethostbyname((char *)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;
}
#endif /* from here on DJGPP joins us again. */
/* 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.
*/
PUBLIC int HTParseInet ARGS2(
SockA *, soc_in,
CONST char *, str)
{
char *port;
int dotcount_ip = 0; /* for dotted decimal IP addr */
#ifndef _WINDOWS_NSL
char *host = NULL;
#endif /* _WINDOWS_NSL */
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;
}
#ifdef _WINDOWS_NSL
strncpy(host, str, (size_t)512);
#else
StrAllocCopy(host, str); /* Make a copy we can mutilate */
#endif /* _WINDOWS_NSL */
/*
** Parse port number if present.
*/
if ((port = strchr(host, ':')) != NULL) {
*port++ = 0; /* Chop off port */
if (port[0] >= '0' && port[0] <= '9') {
#ifdef UNIX
soc_in->sin_port = htons(atol(port));
#else /* VMS: */
#ifdef DECNET
soc_in->sdn_objnum = (unsigned char)(strtol(port, (char**)0, 10));
#else
soc_in->sin_port = htons((unsigned short)strtol(port,(char**)0,10));
#endif /* Decnet */
#endif /* Unix vs. VMS */
#ifdef SUPPRESS /* 1. crashes!?!. 2. Not recommended */
} 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 */
}
}
#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: */
char *strptr = host;
while (*strptr) {
if (*strptr == '.') {
dotcount_ip++;
} else if (!isdigit(*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 DJGPP
soc_in->sin_addr.s_addr = htonl(aton(host));
#else
#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);
#ifndef _WINDOWS_NSL
FREE(host);
#endif /* _WINDOWS_NSL */
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 */
#endif /* DJGPP */
#ifndef _WINDOWS_NSL
FREE(host);
#endif /* _WINDOWS_NSL */
} else { /* Alphanumeric node name: */
#ifdef MVS /* Outstanding problem with crash in MVS gethostbyname */
CTRACE(tfp, "HTParseInet: Calling LYGetHostByName(%s)\n", host);
#endif /* MVS */
#ifdef DJGPP
if (!valid_hostname(host)) {
FREE(host);
return HT_NOT_ACCEPTABLE; /* only HTDoConnect checks this. */
}
soc_in->sin_addr.s_addr = htonl(resolve(host));
if (soc_in->sin_addr.s_addr == 0) {
goto failed;
}
#else /* !DJGPP: */
#ifdef _WINDOWS_NSL
phost = LYGetHostByName(host); /* See above */
if (!phost) goto failed;
memcpy((void *)&soc_in->sin_addr, phost->h_addr, phost->h_length);
#else /* !DJGPP, !_WINDOWS_NSL: */
{
struct hostent *phost;
phost = LYGetHostByName(host); /* See above */
if (!phost) goto failed;
#if defined(VMS) && defined(CMU_TCP)
/*
** In LIBCMU, phost->h_length contains not the length of one address
** (four bytes) but the number of bytes in *h_addr, i.e., some multiple
** of four. Thus we need to hard code the value here, and remember to
** change it if/when IP addresses change in size. :-( LIBCMU is no
** longer supported, and CMU users are encouraged to obtain and use
** SOCKETSHR/NETLIB instead. - S. Bjorndahl
*/
memcpy((void *)&soc_in->sin_addr, phost->h_addr, 4);
#else
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, phost->h_length);
#endif /* VMS && CMU_TCP */
}
#endif /* !DJGPP, !_WINDOWS_NSL */
#endif /* !DJGPP */
#ifndef _WINDOWS_NSL
FREE(host);
#endif /* _WINDOWS_NSL */
} /* 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);
#ifndef _WINDOWS_NSL
FREE(host);
#endif /* _WINDOWS_NSL */
switch (lynx_nsl_status) {
case HT_NOT_ACCEPTABLE:
case HT_INTERRUPTED:
return lynx_nsl_status;
default:
return -1;
}
}
#ifdef LY_FIND_LEAKS
/* Free our name for the host on which we are - FM
** -------------------------------------------
**
*/
PRIVATE void free_HTTCP_hostname NOARGS
{
FREE(hostname);
}
#endif /* LY_FIND_LEAKS */
/* Derive the name of the host on which we are
** -------------------------------------------
**
*/
#ifndef MAXHOSTNAMELEN
#define MAXHOSTNAMELEN 64 /* Arbitrary limit */
#endif /* MAXHOSTNAMELEN */
PRIVATE void get_host_details NOARGS
{
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! */
struct hostent * phost; /* Pointer to host -- See netdb.h */
#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 = getenv("UCX$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! */
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, phost->h_length);
CTRACE(tfp, " Name server says that I am `%s' = %s\n",
hostname, HTInetString(&HTHostAddress));
#endif /* NEED_HOST_ADDRESS */
#endif /* !DECNET */
}
PUBLIC CONST char * HTHostName NOARGS
{
get_host_details();
return hostname;
}
#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 */
/*
** Interruptable 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
*/
PUBLIC int HTDoConnect ARGS4(
CONST char *, url,
char *, protocol,
int, default_port,
int *, s)
{
struct sockaddr_in soc_address;
struct sockaddr_in *soc_in = &soc_address;
int status;
char *line = NULL;
char *p1 = NULL;
char *at_sign = NULL;
char *host = NULL;
/*
** Set up defaults.
*/
memset(soc_in, 0, sizeof(*soc_in));
soc_in->sin_family = AF_INET;
soc_in->sin_port = htons(default_port);
/*
** 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, gettext("Looking up %s."), host);
_HTProgress (line);
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;
}
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.
*/
*s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (*s == -1) {
HTAlert(gettext("socket failed."));
return HT_NO_DATA;
}
#ifndef DOSPATH
#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 */
/*
** 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) {
status = Rconnect(*s, (struct sockaddr*)&soc_address,
sizeof(soc_address));
/*
** For long Rbind.
*/
socks_bind_remoteAddr = soc_address.sin_addr.s_addr;
} else
#endif /* SOCKS */
status = connect(*s, (struct sockaddr*)&soc_address, sizeof(soc_address));
#ifndef DJGPP
/*
** 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 || SOCKET_ERRNO == EAGAIN)) {
struct timeval timeout;
int ret;
int tries=0;
#ifdef SOCKET_DEBUG_TRACE
{
int saved_errno = SOCKET_ERRNO;
HTInetStatus("this socket's first connect");
errno = saved_errno; /* I don't trust HTInetStatus */
}
#endif /* SOCKET_DEBUG_TRACE */
ret = 0;
while (ret <= 0) {
fd_set writefds;
/*
** Protect against an infinite loop.
*/
if (tries++ >= 180000) {
HTAlert(gettext("Connection failed for 180,000 tries."));
return HT_NO_DATA;
}
#ifdef _WINDOWS_NSL
timeout.tv_sec = 100;
#else
timeout.tv_sec = 0;
#endif /* _WINDOWS_NSL */
timeout.tv_usec = 100000;
FD_ZERO(&writefds);
FD_SET(*s, &writefds);
#ifdef SOCKS
if (socks_flag)
ret = Rselect(FD_SETSIZE, NULL,
(void *)&writefds, NULL, &timeout);
else
#endif /* SOCKS */
ret = select(FD_SETSIZE, NULL, (void *)&writefds, NULL, &timeout);
#ifdef SOCKET_DEBUG_TRACE
if (tries == 1) {
int saved_errno = SOCKET_ERRNO;
HTInetStatus("this socket's first select");
errno = saved_errno; /* I don't trust HTInetStatus */
}
#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) {
int saved_errno = SOCKET_ERRNO;
HTInetStatus("failed select");
errno = saved_errno; /* I don't trust HTInetStatus */
}
#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 */
status = connect(*s, (struct sockaddr*)&soc_address,
sizeof(soc_address));
#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) {
int saved_errno = SOCKET_ERRNO;
HTInetStatus("confirm-ready connect");
errno = saved_errno;
}
#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 the EALREADY or EISCONN.
*/
status = connect(*s, (struct sockaddr*)&soc_address,
sizeof(soc_address));
if ((status < 0) &&
(SOCKET_ERRNO != EALREADY && SOCKET_ERRNO != EAGAIN) &&
#ifdef UCX
(SOCKET_ERRNO != 18242) &&
#endif /* UCX */
(SOCKET_ERRNO != EISCONN)) {
#ifdef SOCKET_DEBUG_TRACE
int saved_errno = SOCKET_ERRNO;
HTInetStatus("confirm-not-ready connect");
errno = saved_errno;
#endif /* SOCKET_DEBUG_TRACE */
break;
}
}
if (HTCheckForInterrupt()) {
CTRACE(tfp, "*** INTERRUPTED in middle of connect.\n");
status = HT_INTERRUPTED;
#ifdef _WINDOWS
WSASetLastError(EINTR);
#else
SOCKET_ERRNO = EINTR;
#endif
break;
}
}
}
#ifdef SOCKET_DEBUG_TRACE
else if (status < 0) {
int saved_errno = SOCKET_ERRNO;
HTInetStatus("this socket's first and only connect");
errno = saved_errno; /* I don't trust HTInetStatus */
}
#endif /* SOCKET_DEBUG_TRACE */
#endif /* !DJGPP */
if (status < 0) {
/*
** The connect attempt failed or was interrupted,
** so close up the socket.
*/
NETCLOSE(*s);
}
#ifndef DOSPATH
#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 */
return status;
}
/*
** This is so interruptible reads can be implemented cleanly.
*/
PUBLIC int HTDoRead ARGS3(
int, fildes,
void *, buf,
unsigned, nbyte)
{
int ready, ret;
fd_set readfds;
struct timeval timeout;
int tries=0;
#ifdef EXP_READPROGRESS
int otries = 0;
time_t otime = time((time_t *)0);
#endif
#if defined(UNIX) || defined(UCX)
int nb;
#endif /* UCX, BSN */
#ifdef UNIX
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)
return -1;
if (HTCheckForInterrupt()) {
#ifdef _WINDOWS
WSASetLastError(EINTR);
#else
SOCKET_ERRNO = EINTR;
#endif
return (HT_INTERRUPTED);
}
#if !defined(NO_IOCTL)
ready = 0;
#else
ready = 1;
#endif /* bypass for NO_IOCTL */
while (!ready) {
/*
** Protect against an infinite loop.
*/
if (tries++ >= 180000) {
HTAlert(gettext("Socket read failed for 180,000 tries."));
#ifdef _WINDOWS
WSASetLastError(EINTR);
#else
SOCKET_ERRNO = EINTR;
#endif
return HT_INTERRUPTED;
}
#ifdef EXP_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 {
timeout.tv_sec = 0;
timeout.tv_usec = 100000;
FD_ZERO(&readfds);
FD_SET(fildes, &readfds);
#ifdef SOCKS
if (socks_flag)
ret = Rselect(FD_SETSIZE,
(void *)&readfds, NULL, NULL, &timeout);
else
#endif /* SOCKS */
ret = select(FD_SETSIZE,
(void *)&readfds, NULL, NULL, &timeout);
} while ((ret == -1) && (errno == EINTR));
if (ret < 0) {
return -1;
} else if (ret > 0) {
ready = 1;
} else if (HTCheckForInterrupt()) {
#ifdef _WINDOWS
WSASetLastError(EINTR);
#else
SOCKET_ERRNO = EINTR;
#endif
return HT_INTERRUPTED;
}
}
#if !defined(UCX) || !defined(VAXC)
#ifdef UNIX
while ((nb = SOCKET_READ (fildes, buf, nbyte)) == -1) {
int saved_errno = errno;
if (errno == EINTR)
continue;
#ifdef ERESTARTSYS
if (errno == ERESTARTSYS)
continue;
#endif /* ERESTARTSYS */
HTInetStatus("read");
errno = saved_errno; /* our caller may check it */
break;
}
return nb;
#else /* UNIX */
return SOCKET_READ (fildes, buf, nbyte);
#endif /* !UNIX */
#else /* UCX && VAXC */
/*
** VAXC and UCX problem only.
*/
errno = vaxc$errno = 0;
nb = SOCKET_READ (fildes, buf, nbyte);
CTRACE(tfp,
"Read - nb,errno,vaxc$errno: %d %d %d\n", nb,errno,vaxc$errno);
if ((nb <= 0) && TRACE)
perror ("HTTCP.C:HTDoRead:read"); /* RJF */
/*
** An errno value of EPIPE and nb < 0 indicates end-of-file on VAXC.
*/
if ((nb <= 0) && (errno == EPIPE)) {
nb = 0;
errno = 0;
}
return nb;
#endif /* UCX, BSN */
}
#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>
PUBLIC int BSDselect ARGS5(
int, nfds,
fd_set *, readfds,
fd_set *, writefds,
fd_set *, exceptfds,
struct timeval *, timeout)
{
int rval,
i;
#ifdef SOCKS
if (socks_flag)
rval = Rselect(nfds, readfds, writefds, exceptfds, timeout);
else
#endif /* SOCKS */
rval = select(nfds, readfds, writefds, exceptfds, timeout);
switch (rval) {
case -1:
return(rval);
break;
case 0:
if (readfds != NULL)
FD_ZERO(readfds);
if (writefds != NULL)
FD_ZERO(writefds);
if (exceptfds != NULL)
FD_ZERO(exceptfds);
return(rval);
break;
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 */
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