/* 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 #include #include #include #include /* added for no_suspend */ #include #ifdef NSL_FORK #include #include #endif /* NSL_FORK */ #ifdef HAVE_RESOLV_H #include #endif #ifdef __DJGPP__ #include #endif /* __DJGPP__ */ #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 * 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 /* ** Module-Wide variables */ PRIVATE char *hostname = NULL; /* The name of this host */ /* ** PUBLIC VARIABLES */ #ifdef SOCKS 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. */ #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 /* * This chunk of code is used in both win32 and cygwin. */ #if defined(_WINDOWS_NSL) static char host[512]; static struct hostent *phost; /* Pointer to host - See netdb.h */ static int donelookup; static unsigned long _fork_func (void *arglist GCC_UNUSED) { #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 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$get_sdc (d)) == 0) { set_errno(EBADF); return -1; } ioctl_desc.opt = UCX$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$qiow (0, sdc, fun, iosb, 0, 0, 0, 0, 0, 0, p5, p6); if (!(status & 01)) { set_errno(status); return -1; } if (!(iosb[0] & 01)) { set_errno(iosb[0]); return -1; } return 0; } #endif /* VMS && UCX */ #define MY_FORMAT "TCP: Error %d in `SOCKET_ERRNO' after call to %s() failed.\n\t%s\n" /* third arg is transport/platform specific */ /* Report Internet Error ** --------------------- */ PUBLIC int HTInetStatus ARGS1( char *, where) { int status; int saved_errno = errno; #ifdef VMS #ifdef MULTINET SOCKET_ERRNO = vmserrno; #endif /* MULTINET */ #endif /* VMS */ #ifdef VM CTRACE((tfp, MY_FORMAT, SOCKET_ERRNO, where, "(Error number not translated)")); /* What Is the VM equiv? */ #define ER_NO_TRANS_DONE #endif /* VM */ #ifdef VMS #ifdef MULTINET CTRACE((tfp, MY_FORMAT, SOCKET_ERRNO, where, vms_errno_string())); #else CTRACE((tfp, MY_FORMAT, SOCKET_ERRNO, where, ((SOCKET_ERRNO > 0 && SOCKET_ERRNO <= 65) ? strerror(SOCKET_ERRNO) : "(Error number not translated)"))); #endif /* MULTINET */ #define ER_NO_TRANS_DONE #endif /* VMS */ #ifdef HAVE_STRERROR CTRACE((tfp, MY_FORMAT, SOCKET_ERRNO, where, strerror(SOCKET_ERRNO))); #define ER_NO_TRANS_DONE #endif /* HAVE_STRERROR */ #ifndef ER_NO_TRANS_DONE CTRACE((tfp, MY_FORMAT, SOCKET_ERRNO, where, (SOCKET_ERRNO < sys_nerr ? sys_errlist[SOCKET_ERRNO] : "Unknown error" ))); #endif /* !ER_NO_TRANS_DONE */ #ifdef VMS #ifndef MULTINET CTRACE((tfp, " Unix error number (SOCKET_ERRNO) = %ld dec\n", SOCKET_ERRNO)); CTRACE((tfp, " VMS error (vaxc$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 */ 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) { #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. */ PUBLIC BOOL valid_hostname ARGS1( 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 */ PRIVATE void quench ARGS1( int, sig GCC_UNUSED) { _exit(2); } #endif /* NSL_FORK */ PUBLIC 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 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. */ #ifdef NSL_FORK #define REHOSTENT_SIZE 128 /* not bigger than pipe buffer! */ typedef struct { struct hostent h; char rest[REHOSTENT_SIZE]; } AlignedHOSTENT; PRIVATE size_t fill_rehostent ARGS3( char *, rehostent, size_t, rehostentsize, CONST struct 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(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; } } } 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; } #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 /* 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( char *, str) { #ifndef _WINDOWS_NSL char *host = str; #endif #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 */ struct 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; } #ifdef _WINDOWS_NSL strncpy(host, str, sizeof(host)); #endif /* _WINDOWS_NSL */ 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 ) { 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 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", (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 || (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, (void *)&readfds, NULL, NULL, &one_second); else #endif /* SOCKS */ selret = select(pfd[0] + 1, (void *)&readfds, NULL, NULL, &one_second); 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; 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(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, 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, dwThreadID; #ifndef __CYGWIN__ if (!system_is_NT) { /* for Windows9x */ unsigned long t; t = (unsigned long)inet_addr(host); if ((int)t != -1) phost = gethostbyaddr((char *)&t, sizeof (t), AF_INET); else phost = gethostbyname(host); } else { /* for Windows NT */ #endif /* !__CYGWIN__ */ phost = (struct hostent *) NULL; donelookup = FALSE; 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); 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 (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(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 PRIVATE int HTParseInet ARGS2( SockA *, soc_in, CONST char *, str) { char *port; int dotcount_ip = 0; /* for dotted decimal IP addr */ char *strptr; #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, sizeof(host)); #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 */ 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') { #ifndef _WINDOWS_NSL FREE(host); #endif /* _WINDOWS_NSL */ 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)); #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 */ #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 _WINDOWS_NSL phost = LYGetHostByName(host); /* See above */ if (!phost) goto failed; memcpy((void *)&soc_in->sin_addr, phost->h_addr, phost->h_length); #else /* !_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 /* _WINDOWS_NSL */ #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; } } #endif /* !INET6 */ #ifdef INET6 PRIVATE struct addrinfo * HTGetAddrInfo ARGS2( CONST char *, str, CONST int, defport) { struct addrinfo hints, *res; int error; char *p; char *s; char *host, *port; char pbuf[80]; s = strdup(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; } return res; } #endif /* INET6 */ #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 ** ------------------------------------------- ** */ 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! */ #ifdef INET6 struct addrinfo hints, *res; int error; #else struct 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, 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 */ } 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 */ /* ** 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 */ PUBLIC int HTDoConnect ARGS4( CONST char *, url, 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 struct 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. */ #ifdef INET6 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; } #else *s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if (*s == -1) { HTAlert(gettext("socket failed.")); return HT_NO_DATA; } #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)); #endif /* INET6 */ /* ** For long Rbind. */ socks_bind_remoteAddr = soc_address.sin_addr.s_addr; } 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, (void *)&writefds, NULL, &select_timeout); else #endif /* SOCKS */ ret = select((unsigned)*s + 1, NULL, (void *)&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 the 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 (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) { 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. */ PUBLIC int HTDoRead ARGS3( int, fildes, void *, buf, unsigned, nbyte) { int ready, ret; fd_set readfds; struct timeval select_timeout; int tries=0; #ifdef USE_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 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, (void *)&readfds, NULL, NULL, &select_timeout); else #endif /* SOCKS */ ret = select((unsigned)fildes + 1, (void *)&readfds, NULL, NULL, &select_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) { if (errno == EINTR) continue; #ifdef ERESTARTSYS if (errno == ERESTARTSYS) continue; #endif /* ERESTARTSYS */ HTInetStatus("read"); 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; set_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 #include #include PUBLIC int BSDselect ARGS5( 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 */