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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;
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.