optimized network paths for news 2.10.2
William L. Sebok
wls at astrovax.UUCP
Mon Oct 15 16:07:20 AEST 1984
The following addition to news 2.10.2 has been posted before but it is so
important that I think it needs reiterating. This addition implements a
C pre-processor variable NETPATHS that causes the reply command of readnews
and vnews to use optimized network paths rather than the roundabout news
arrival path. NETPATHS is defined in defs.h to be the name of a dbm-style
file.
This file, uses site names as keys, and under these keys stores the
path to the site with a %s in place of a name of a user at that site. For
example, under the key "sitename" might be stored the string:
site1!site2!sitename!%s
A file of this form can be generated with pathalias.
If a site is not found in the database the path up to the first site in the
news path present in the database is used.
I have a somewhat different philosophy here than Chuq Von Rospach, who has
optimization invoked by a -o option. Optimization is the default. It is the
naive user I want make use the optimized paths. For the sophisticated user
I have provided the News-path: field in the header which contains the
convoluted news path. This sophisticated user can edit the full path back
by hand if he/she is so inclined. I have intentionally made the user have to
go to some extra work to get un-optimized paths.
It is my strong belief that these additions or some other hooks for path
optimizing should be part of the "official distribution". After all it is
an option. With the posting of the Uucp map I do not believe that there is
any excuse for replies with long paths bouncing around the net. If some
hooks for path optimization are not included in the official distribution
there will be no justification for the net powers to complain about the money
wasted by replies passing through large numbers of sites.
Bill Sebok Princeton University, Astrophysics
{allegra,akgua,burl,cbosgd,decvax,ihnp4,noao,princeton,vax135}!astrovax!wls
*** defs.h.ORIG Mon Oct 15 01:19:25 1984
--- defs.h Mon Oct 15 01:18:13 1984
***************
*** 47,52
/* the .newsrc */
#define ZAPNOTES /* if you want old style notes headers moved
/* into the headers */
#define BSD4_2 /* if you are running 4.2 BSD */
/* #define BSD4_1C /* if you are running 4.1c BSD */
#define SENDMAIL "/usr/lib/sendmail -oi -oem" /* command line to run
--- 47,54 -----
/* the .newsrc */
#define ZAPNOTES /* if you want old style notes headers moved
/* into the headers */
+ #define NETPATHS "/usr/lib/uucp/alpath" /* compiles in pathalias optimizing */
+ /* code to read,vnews */
#define BSD4_2 /* if you are running 4.2 BSD */
/* #define BSD4_1C /* if you are running 4.1c BSD */
#define SENDMAIL "/usr/lib/sendmail -oi -oem" /* command line to run
*** visual.c.ORIG Sat Oct 6 20:44:48 1984
--- visual.c Sun Oct 14 23:47:19 1984
***************
*** 17,22
#include <errno.h>
#include "rparams.h"
#if defined(BSD4_2) || defined(BSD4_1C)
#include <sys/dir.h>
#else
--- 17,28 -----
#include <errno.h>
#include "rparams.h"
+ #ifdef NETPATHS
+ # include <dbm.h>
+ # ifdef NULL
+ # undef NULL
+ # endif NULL
+ #endif NETPATHS
#if defined(BSD4_2) || defined(BSD4_1C)
#include <sys/dir.h>
#else
***************
*** 811,816
char *replyname();
struct stat statb;
time_t creatm;
/* Put the user in the editor to create the body of the reply. */
ed = getenv("EDITOR");
--- 839,852 -----
char *replyname();
struct stat statb;
time_t creatm;
+ #ifdef NETPATHS
+ /* stuff for finding paths in pathalias database */
+ static dbmopen = 0;
+ static char newspaths[] = NETPATHS;
+ datum key, result;
+ register char *p1, *p2;
+ char sitename[100];
+ #endif NETPATHS
/* Put the user in the editor to create the body of the reply. */
ed = getenv("EDITOR");
***************
*** 843,851
else
#endif
p = replyname(h);
! fprintf(rfp, "To: %s\n", p);
! fprintf(rfp, "Subject: %s\n", subj);
! fprintf(rfp, "In-reply-to: your article %s\n", h->ident);
sprintf(rcbuf, "%s -t < %s; rm -f %s", MAILPARSER, tf, tf);
nogomsg = "Mail not sent";
putc('\n', rfp);
--- 879,917 -----
else
#endif
p = replyname(h);
! #ifdef NETPATHS
! /* Use data Base to Find a reply a Path to a site */
! if (dbmopen==0)
! dbmopen = (dbminit(newspaths)==0) ? 1 : -1 ;
!
! result.dptr = NULL;
! if (dbmopen>0) {
! for(p1 = p; (p2 = index(p1,'!'))!=NULL; p1 = p2+1);
! if (p != p1) {
! key.dptr = sitename;
! p1--;
! do {
! for (p2=p1; (p1!=p) && (*--p1!='!'); );
! key.dsize = p2 - p1 ;
! strncpy(sitename, p1+1, key.dsize);
! sitename[key.dsize-1] = '\0';
! result = fetch(key);
! } while ( (p1 != p) && result.dptr == NULL);
! }
! }
! if (dbmopen > 0 && result.dptr != NULL) {
! fprintf(rfp, "To: ");
! fprintf(rfp, result.dptr, p2+1);
! fprintf(rfp, "\nSubject: %s\n", subj);
! fprintf(rfp, "In-reply-to: your article %s\n", h->ident);
! fprintf(rfp, "News-path: %s\n", p);
! } else
! #endif NETPATHS
! {
! fprintf(rfp, "To: %s\n", p);
! fprintf(rfp, "Subject: %s\n", subj);
! fprintf(rfp, "In-reply-to: your article %s\n", h->ident);
! }
sprintf(rcbuf, "%s -t < %s; rm -f %s", MAILPARSER, tf, tf);
nogomsg = "Mail not sent";
putc('\n', rfp);
********************
*** readr.c.ORIG Sat Oct 6 20:13:40 1984
--- readr.c Sun Oct 14 23:48:24 1984
***************
*** 7,12
#endif !lint
#include "rparams.h"
#if defined(BSD4_2) || defined(BSD4_1C)
#include <sys/dir.h>
#else
--- 7,20 -----
#endif !lint
#include "rparams.h"
+
+ #ifdef NETPATHS
+ # include <dbm.h>
+ # ifdef NULL
+ # undef NULL
+ # endif NULL
+ #endif NETPATHS
+
#if defined(BSD4_2) || defined(BSD4_1C)
#include <sys/dir.h>
#else
***************
*** 616,621
char folbuf[BUFLEN];
struct stat statb;
long creatm;
hptr = h;
while (*bptr && index("d-", *bptr)) {
--- 644,657 -----
char folbuf[BUFLEN];
struct stat statb;
long creatm;
+ #ifdef NETPATHS
+ /* stuff for finding paths from pathalias database */
+ static int dbmopen = 0;
+ static char newspaths[] = NETPATHS;
+ datum key, result;
+ register char *p1, *p2;
+ char sitename[100];
+ #endif NETPATHS
hptr = h;
***************
*** 649,654
*rcbuf = '\0';
pathptr = replyname(hptr);;
for (ptr1 = address, ptr2 = pathptr; *ptr2; ptr1++, ptr2++) {
if (index("\"\\$", *ptr2))
*ptr1++ = '\\';
--- 686,717 -----
*rcbuf = '\0';
pathptr = replyname(hptr);;
+ #ifdef NETPATHS
+ /* Use data Base to Find a reply a Path to a site --- W. Sebok */
+ if (dbmopen==0)
+ dbmopen = (dbminit(newspaths)==0) ? 1 : -1 ;
+
+ result.dptr = NULL;
+ if (dbmopen>0) {
+ for(p1 = pathptr; (p2 = index(p1,'!')) != NULL; p1 = p2+1);
+ if (pathptr != p1) {
+ key.dptr = sitename;
+ p1--;
+ do {
+ for ( p2=p1; (p1!=pathptr) && (*--p1 != '!'); );
+ key.dsize = p2 - p1 ;
+ strncpy(sitename, p1+1, key.dsize);
+ sitename[key.dsize-1] = '\0';
+ result = fetch(key);
+ } while ( (p1 != pathptr) && result.dptr==NULL);
+ }
+ }
+ if (result.dptr != NULL) {
+ sprintf(sitename, result.dptr, p2+1);
+ p1 = pathptr;
+ pathptr = sitename;
+ }
+ #endif NETPATHS
for (ptr1 = address, ptr2 = pathptr; *ptr2; ptr1++, ptr2++) {
if (index("\"\\$", *ptr2))
*ptr1++ = '\\';
***************
*** 695,700
} else {
fprintf(tfp, "To: %s\n", pathptr);
fprintf(tfp, "Subject: %s\n", subj);
fprintf(tfp, "References: %s\n\n", folbuf);
fstat(fileno(tfp), &statb);
creatm = statb.st_mtime;
--- 758,767 -----
} else {
fprintf(tfp, "To: %s\n", pathptr);
fprintf(tfp, "Subject: %s\n", subj);
+ #ifdef NETPATHS
+ if (dbmopen > 0 && result.dptr != NULL)
+ fprintf(tfp,"News-path: %s\n",p1);
+ #endif NETPATHS
fprintf(tfp, "References: %s\n\n", folbuf);
fstat(fileno(tfp), &statb);
creatm = statb.st_mtime;
************
--
Bill Sebok Princeton University, Astrophysics
{allegra,akgua,burl,cbosgd,decvax,ihnp4,noao,princeton,vax135}!astrovax!wls
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