/* 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 #ifdef NSL_FORK #include #include #endif /* NSL_FORK */ #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 #ifdef SHORT_NAMES #define HTInetStatus HTInStat #define HTInetString HTInStri #define HTParseInet HTPaInet #endif /* SHORT_NAMES */ #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 #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) { phost = gethostbyname(host); 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 #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 */ #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 */ /* 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 soc_in->sin_addr.s_addr = inet_addr(host); /* See arpa/inet.h */ #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 gethostbyname(%s)\n", host); #endif /* MVS */ #ifdef NSL_FORK /* ** Start block for fork-based gethostbyname() with ** checks for interrupts. - Tom Zerucha (tz@execpc.com) & FM */ { int success = 0; /* ** Pipe, child pid, status buffers, cycle count, select() ** control variables. */ pid_t fpid, waitret; int pfd[2], h_length, selret, readret, waitstat = 0, cycle = 0; 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 ((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); /* ** Child won't use read side. -BL */ close(pfd[0]); phost = gethostbyname(host); #ifdef MVS CTRACE(tfp, "HTParseInet: gethostbyname() returned %d\n", phost); #endif /* MVS */ /* ** Send length of subsequent value to parent (as a ** native int). */ if (OK_HOST(phost)) h_length = phost->h_length; else h_length = 0; write(pfd[1], &h_length, sizeof h_length); if (h_length) { /* ** Return value through pipe... */ write(pfd[1], phost->h_addr, phost->h_length); _exit(0); } else { /* ** ... or return error as exit code. */ _exit(1); } } /* ** (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 */ while (cycle < dns_patience) { /* ** Avoid infinite loop in the face of the unexpected. -BL */ cycle++; FD_ZERO(&readfds); #ifndef USE_SLANG /* ** 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 */ if (isatty(fileno(stdin))) FD_SET(fileno(stdin), &readfds); #endif /* USE_SLANG */ 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 length of address. -BL */ readret = read(pfd[0], (void *)&h_length, sizeof h_length); if (readret == sizeof h_length && h_length == sizeof soc_in->sin_addr) { /* ** Then get address itself. -BL */ readret = read(pfd[0], (void *)&soc_in->sin_addr, h_length); if (readret == h_length) success = 1; } /* ** 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; cycle--; continue; } /* ** Abort if interrupt key pressed. */ if (HTCheckForInterrupt()) { CTRACE(tfp, "HTParseInet: INTERRUPTED gethostbyname.\n"); kill(fpid, SIGTERM); waitpid(fpid, NULL, WNOHANG); FREE(host); close(pfd[0]); return HT_INTERRUPTED; } } close(pfd[0]); if (waitret <= 0) { kill(fpid, SIGTERM); waitret = waitpid(fpid, &waitstat, WNOHANG); } if (waitret > 0) { if (WIFEXITED(waitstat)) { CTRACE(tfp, "HTParseInet: NSL_FORK child %d exited, status 0x%x.\n", (int)waitret, waitstat); } else if (WIFSIGNALED(waitstat)) { CTRACE(tfp, "HTParseInet: NSL_FORK child %d got signal, status 0x%x!\n", (int)waitret, waitstat); #ifdef WCOREDUMP if (WCOREDUMP(waitstat)) { CTRACE(tfp, "HTParseInet: NSL_FORK child %d dumped core!\n", (int)waitret); } #endif /* WCOREDUMP */ } else if (WIFSTOPPED(waitstat)) { CTRACE(tfp, "HTParseInet: NSL_FORK child %d is stopped, status 0x%x!\n", (int)waitret, waitstat); } } if (!success) { memset((void *)&soc_in->sin_addr, 0, sizeof(soc_in->sin_addr)); goto failed; } } #else /* Not NSL_FORK: */ #ifdef DJGPP soc_in->sin_addr.s_addr = htonl(resolve(host)); if (soc_in->sin_addr.s_addr == 0) { goto failed; } #else /* !NSL_FORK, !DJGPP: */ #ifdef _WINDOWS_NSL { #ifdef __BORLANDC__ HANDLE hThread, dwThreadID; #else unsigned long hThread, dwThreadID; #endif /* __BORLANDC__ */ phost = (struct hostent *) NULL; hThread = CreateThread((void *)NULL, 4096UL, #ifdef __BORLANDC__ (LPTHREAD_START_ROUTINE)_fork_func, #else (unsigned long (*)())_fork_func, #endif /* __BORLANDC__ */ (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); return HT_INTERRUPTED; }; }; if (!phost) goto failed; memcpy((void *)&soc_in->sin_addr, phost->h_addr, phost->h_length); #else /* !NSL_FORK, !DJGPP, !_WINDOWS_NSL: */ { struct hostent *phost; phost = gethostbyname(host); /* See netdb.h */ #ifdef MVS CTRACE(tfp, "HTParseInet: gethostbyname() returned %d\n", phost); #endif /* MVS */ 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 memcpy((void *)&soc_in->sin_addr, phost->h_addr, phost->h_length); #endif /* VMS && CMU_TCP */ } #endif /* !NSL_FORK, !DJGPP, !_WINDOWS_NSL */ #endif /* !NSL_FORK, !DJGPP */ #endif /* !NSL_FORK */ #ifndef _WINDOWS_NSL FREE(host); #endif /* _WINDOWS_NSL */ } 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 */ return -1; } /* Free our name for the host on which we are - FM ** ------------------------------------------- ** */ PRIVATE void free_HTTCP_hostname NOARGS { FREE(hostname); } /* 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); atexit(free_HTTCP_hostname); #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; } /* ** 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); line = (char *)calloc(1, (strlen(host) + strlen(protocol) + 128)); if (line == NULL) outofmem(__FILE__, "HTDoConnect"); sprintf (line, gettext("Looking up %s."), host); _HTProgress (line); status = HTParseInet(soc_in, host); if (status) { if (status != HT_INTERRUPTED) { sprintf (line, gettext("Unable to locate remote host %s."), host); _HTProgress(line); status = HT_NO_DATA; } FREE(host); FREE(line); return status; } sprintf (line, gettext("Making %s connection to %s."), protocol, host); _HTProgress (line); FREE(host); /* ** 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.")); FREE(line); 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; ret = 0; while (ret <= 0) { fd_set writefds; /* ** Protect against an infinite loop. */ if (tries++ >= 180000) { HTAlert(gettext("Connection failed for 180,000 tries.")); FREE(line); 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); /* ** If we suspend, then it is possible that select will be ** interrupted. Allow for this possibility. - JED */ if ((ret == -1) && (errno == EINTR)) continue; /* ** 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 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)) { break; } } if (HTCheckForInterrupt()) { CTRACE(tfp, "*** INTERRUPTED in middle of connect.\n"); status = HT_INTERRUPTED; SOCKET_ERRNO = EINTR; break; } } } #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 */ FREE(line); 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; #if defined(UNIX) || defined(UCX) int nb; #endif /* UCX, BSN */ if (fildes <= 0) return -1; if (HTCheckForInterrupt()) { SOCKET_ERRNO = EINTR; 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.")); SOCKET_ERRNO = EINTR; return HT_INTERRUPTED; } /* ** 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()) { SOCKET_ERRNO = EINTR; 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 #include #include 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 */