/* 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. */ #include "HTUtils.h" #include "tcp.h" /* Defines SHORT_NAMES if necessary */ #ifdef SHORT_NAMES #define HTInetStatus HTInStat #define HTInetString HTInStri #define HTParseInet HTPaInet #endif /* Module-Wide variables */ PRIVATE char *hostname=0; /* The name of this host */ /* PUBLIC VARIABLES */ /* 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 #ifndef MULTINET /* maybe for UCX and WIN_TCP too */ extern int uerrno; /* Deposit of error info (as per errno.h) */ extern volatile noshare int socket_errno; /* socket VMS error info (used for translation of vmserrno) */ extern volatile noshare int vmserrno; /* Deposit of VMS error info */ extern volatile noshare int errno; /* noshare to avoid PSECT conflict */ #endif /* not MULTINET */ #else /* VMS */ #ifndef errno extern int errno; #endif /* errno */ #endif /* VMS */ #ifndef VM #ifndef VMS #ifndef NeXT #ifndef THINK_C extern char *sys_errlist[]; /* see man perror on cernvax */ extern int sys_nerr; #endif /* think c */ #endif /* NeXT */ #endif /* VMS */ #endif /* VM */ #endif /* PCNFS */ /* Report Internet Error ** --------------------- */ #ifdef __STDC__ PUBLIC int HTInetStatus(char *where) #else PUBLIC int HTInetStatus(where) char *where; #endif { #ifdef VMS #ifdef MULTINET socket_errno = vmserrno; #endif #endif CTRACE(tfp, "TCP: Error %d in `errno' after call to %s() failed.\n\t%s\n", errno, where, #ifdef VM "(Error number not translated)"); /* What Is the VM equiv? */ #define ER_NO_TRANS_DONE #endif #ifdef VMS #ifdef MULTINET vms_errno_string()); #else "(Error number not translated)"); #endif #define ER_NO_TRANS_DONE #endif #ifdef NeXT strerror(errno)); #define ER_NO_TRANS_DONE #endif #ifdef THINK_C strerror(errno)); #define ER_NO_TRANS_DONE #endif #ifndef ER_NO_TRANS_DONE errno < sys_nerr ? sys_errlist[errno] : "Unknown error" ); #endif #ifdef VMS #ifndef MULTINET CTRACE(tfp, " Unix error number (uerrno) = %ld dec\n", uerrno); CTRACE(tfp, " VMS error (vmserrno) = %lx hex\n", vmserrno); #endif #endif #ifdef VMS /* uerrno and errno happen to be zero if vmserrno <> 0 */ return -vmserrno; #else return -errno; #endif } /* 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) { int n; if ( (**pp<'0') || (**pp>'9')) { /* Null string is error */ *pstatus = -3; /* No number where one expeceted */ 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*,sin) { static char string[16]; sprintf(string, "%d.%d.%d.%d", (int)*((unsigned char *)(&sin->sin_addr)+0), (int)*((unsigned char *)(&sin->sin_addr)+1), (int)*((unsigned char *)(&sin->sin_addr)+2), (int)*((unsigned char *)(&sin->sin_addr)+3)); return string; } #endif /* Decnet */ /* 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. ** sin points to the binary internet or decnet address field. ** ** On exit, ** *sin is filled in. If no port is specified in str, that ** field is left unchanged in *sin. */ PUBLIC int HTParseInet ARGS2(SockA *,sin, CONST char *,str) { char *port; char host[256]; struct hostent *phost; /* Pointer to host - See netdb.h */ strcpy(host, str); /* Take a copy we can mutilate */ /* Parse port number if present */ if (port=strchr(host, ':')) { *port++ = 0; /* Chop off port */ if (port[0]>='0' && port[0]<='9') { #ifdef unix sin->sin_port = htons(atol(port)); #else /* VMS */ #ifdef DECNET sin->sdn_objnum = (unsigned char) (strtol(port, (char**)0 , 10)); #else sin->sin_port = htons(strtol(port, (char**)0 , 10)); #endif /* Decnet */ #endif /* Unix vs. VMS */ } else { #ifdef SUPPRESS /* 1. crashes!?!. 2. Not recommended */ struct servent * serv = getservbyname(port, (char*)0); if (serv) sin->sin_port = serv->s_port; else if (TRACE) fprintf(stderr, "TCP: Unknown service %s\n", port); #endif } } #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. */ sin->sdn_nam.n_len = min(DN_MAXNAML, strlen(host)); /* <=6 in phase 4 */ strncpy (sin->sdn_nam.n_name, host, sin->sdn_nam.n_len + 1); if (TRACE) fprintf(stderr, "DECnet: Parsed address as object number %d on host %.6s...\n", sin->sdn_objnum, host); #else /* parse Internet host */ /* Parse host number if present. */ if (*host>='0' && *host<='9') { /* Numeric node address: */ sin->sin_addr.s_addr = inet_addr(host); /* See arpa/inet.h */ /* sin->sin_addr.s_addr = inet_addr(host).s_addr; /* See arpa/inet.h */ } else { /* Alphanumeric node name: */ #ifdef MVS /* Oustanding problem with crash in MVS gethostbyname */ if(TRACE)fprintf(stderr, "HTTCP: Calling gethostbyname(%s)\n", host); #endif phost=gethostbyname(host); /* See netdb.h */ #ifdef MVS if(TRACE)fprintf(stderr, "HTTCP: gethostbyname() returned %d\n", phost); #endif if (!phost) { if (TRACE) fprintf(stderr, "HTTPAccess: Can't find internet node name `%s'.\n",host); return -1; /* Fail? */ } memcpy(&sin->sin_addr, phost->h_addr, phost->h_length); } if (TRACE) fprintf(stderr, "TCP: Parsed address as port %d, IP address %d.%d.%d.%d\n", (int)ntohs(sin->sin_port), (int)*((unsigned char *)(&sin->sin_addr)+0), (int)*((unsigned char *)(&sin->sin_addr)+1), (int)*((unsigned char *)(&sin->sin_addr)+2), (int)*((unsigned char *)(&sin->sin_addr)+3)); #endif /* Internet vs. Decnet */ return 0; /* OK */ } /* Derive the name of the host on which we are ** ------------------------------------------- ** */ #ifdef __STDC__ PRIVATE void get_host_details(void) #else PRIVATE void get_host_details() #endif #ifndef MAXHOSTNAMELEN #define MAXHOSTNAMELEN 64 /* Arbitrary limit */ #endif { char name[MAXHOSTNAMELEN+1]; /* The name of this host */ #ifdef NEED_HOST_ADDRESS /* no -- needs name server! */ struct hostent * phost; /* Pointer to host -- See netdb.h */ #endif int namelength = sizeof(name); if (hostname) return; /* Already done */ gethostname(name, namelength); /* Without domain */ CTRACE(tfp, "TCP: Local host name is %s\n", name); StrAllocCopy(hostname, name); #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 (!phost) { if (TRACE) fprintf(stderr, "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); if (TRACE) fprintf(stderr, " Name server says that I am `%s' = %s\n", hostname, HTInetString(&HTHostAddress)); #endif #endif /* not Decnet */ } #ifdef __STDC__ PUBLIC const char * HTHostName(void) #else PUBLIC char * HTHostName() #endif { get_host_details(); return hostname; }