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- /* Generic Communication Code HTTCP.c
- ** ==========================
- **
- ** This code is in common between client and server sides.
- */
-
-
- #include "HTUtils.h"
- #include "tcp.h" /* Defines SHORT_NAMES if necessary */
- #ifdef SHORT_NAMES
- #define HTInetStatus HTInStat
- #define HTInetString HTInStri
- #endif
-
-
- /* Module-Wide variables
- */
-
- PRIVATE char *hostname=0; /* The name of this host */
-
-
- /* PUBLIC VARIABLES
- */
-
- PUBLIC struct sockaddr_in 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 vms
- extern int uerrno; /* Deposit of error info (as perr errno.h) */
- extern int vmserrno; /* Deposit of VMS error info */
- extern volatile noshare int errno; /* noshare to avoid PSECT conflict */
- #else
- #ifndef errno
- extern int errno;
- #endif
- #endif
-
- #ifndef VM
- #ifndef vms
- #ifndef NeXT
- extern char *sys_errlist[]; /* see man perror on cernvax */
- extern int sys_nerr;
- #endif
- #endif
- #endif
-
-
- /* Report Internet Error
- ** ---------------------
- */
- #ifdef __STDC__
- PUBLIC int HTInetStatus(char *where)
- #else
- PUBLIC int HTInetStatus(where)
- char *where;
- #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
- "(Error number not translated)");
- #define ER_NO_TRANS_DONE
- #endif
- #ifdef NeXT
- strerror(errno));
- #define ER_NO_TRANS_DONE
- #endif
-
- #ifndef ER_NO_TRANS_DONE
- errno < sys_nerr ? sys_errlist[errno] : "Unknown error" );
- #endif
-
-
- #ifdef vms
- CTRACE(tfp, " Unix error number (uerrno) = %ld dec\n", uerrno);
- CTRACE(tfp, " VMS error (vmserrno) = %lx hex\n", vmserrno);
- #endif
- return -errno;
- }
-
-
- /* 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
- */
- #ifdef __STDC__
- PUBLIC unsigned int HTCardinal(int *pstatus,
- char **pp,
- unsigned int max_value)
- #else
- PUBLIC unsigned int HTCardinal(pstatus, pp, max_value)
- int *pstatus;
- char **pp;
- unsigned int max_value;
- #endif
- {
- 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;
- }
-
-
- /* Produce a string for an inernet address
- ** ---------------------------------------
- **
- ** On exit,
- ** returns a pointer to a static string which must be copied if
- ** it is to be kept.
- */
- #ifdef __STDC__
- PUBLIC const char * HTInetString(struct sockaddr_in* sin)
- #else
- PUBLIC char * HTInetString(sin)
- struct sockaddr_in *sin;
- #endif
- {
- static char string[16];
- sprintf(string, "%d.%d.%d.%d",
- (int)*((unsigned char *)(&HTHostAddress.sin_addr)+0),
- (int)*((unsigned char *)(&HTHostAddress.sin_addr)+1),
- (int)*((unsigned char *)(&HTHostAddress.sin_addr)+2),
- (int)*((unsigned char *)(&HTHostAddress.sin_addr)+3));
- return string;
- }
-
-
- /* Parse an internet 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 address field.
- **
- ** On exit,
- ** *sin is filled in. If no port is specified in str, that
- ** field is left unchanged in *sin.
- */
- #ifdef __STDC__
- PUBLIC int HTParseInet(struct sockaddr_in* sin, const char *str)
- #else
- PUBLIC int HTParseInet(sin, str)
- struct sockaddr *sin;
- char *str;
- #endif
- {
- 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=index(host, ':')) {
- *port++ = 0; /* Chop off port */
- if (port[0]>='0' && port[0]<='9') {
- sin->sin_port = htons(strtol(port, (char**)0 , 10));
- } 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) printf("TCP: Unknown service %s\n", port);
- #endif
- }
- }
-
- /* 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 */
-
- } else { /* Alphanumeric node name: */
- phost=gethostbyname(host); /* See netdb.h */
- if (!phost) {
- if (TRACE) printf(
- "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) printf(
- "TCP: Parsed address as port %d, IP address %d.%d.%d.%d\n",
- (unsigned 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));
-
- 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 */
- struct hostent * phost; /* Pointer to host -- See netdb.h */
- int namelength = sizeof(name);
-
- if (hostname) return; /* Already done */
- gethostname(name, namelength); /* Without domain */
- CTRACE(tfp, "TCP: Local host name is %s\n", name);
- phost=gethostbyname(name); /* See netdb.h */
- if (!phost) {
- if (TRACE) printf(
- "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) printf(" Name server says that is `%s' = %s\n",
- hostname, HTInetString(&HTHostAddress));
- }
-
- #ifdef __STDC__
- PUBLIC const char * HTHostName(void)
- #else
- PUBLIC char * HTHostName()
- #endif
- {
- get_host_details();
- return hostname;
- }
-
-