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- /********************************************************************
- * $Author: lindner $
- * $Revision: 1.1 $
- * $Date: 1992/12/10 23:13:27 $
- * $Source: /home/mudhoney/GopherSrc/release1.11/gopherd/RCS/serverutil.c,v $
- * $Status: $
- *
- * Paul Lindner, University of Minnesota CIS.
- *
- * Copyright 1991, 1992 by the Regents of the University of Minnesota
- * see the file "Copyright" in the distribution for conditions of use.
- *********************************************************************
- * MODULE: serverutil.c
- * utilities for the server.
- *********************************************************************
- * Revision History:
- * $Log: serverutil.c,v $
- * Revision 1.1 1992/12/10 23:13:27 lindner
- * gopher 1.1 release
- *
- *
- *********************************************************************/
-
-
-
- #include "gopherd.h"
-
- /*
- * This routine cleans up an open file descriptor and sends out a bogus
- * filename with the error message
- */
-
- void
- Abortoutput(sockfd, errmsg)
- int sockfd;
- char *errmsg;
- {
- char outputline[256];
-
- sprintf(outputline, "0Server error: %s\t\terror.host\t1\r\n.\r\n", errmsg);
- LOGGopher(sockfd, errmsg);
-
- if (writestring(sockfd, outputline)<0) {
- LOGGopher(sockfd, "Client went away!");
- exit(-1);
- }
- close(sockfd);
-
- return;
- }
-
-
-
- /*
- * is_mail_from_line - Is this a legal unix mail "From " line?
- *
- * Given a line of input will check to see if it matches the standard
- * unix mail "from " header format. Returns 0 if it does and <0 if not.
- *
- * 2 - Very strict, also checks that each field contains a legal value.
- *
- * Assumptions: Not having the definitive unix mailbox reference I have
- * assumed that unix mailbox headers follow this format:
- *
- * From <person> <date> <garbage>
- *
- * Where <person> is the address of the sender, being an ordinary
- * string with no white space imbedded in it, and <date> is the date of
- * posting, in ctime(3C) format.
- *
- * This would, on the face of it, seem valid. I (Bernd) have yet to find a
- * unix mailbox header which doesn't follow this format.
- *
- * From: Bernd Wechner (bernd@bhpcpd.kembla.oz.au)
- * Obfuscated by: KFS (as usual)
- */
-
- #define MAX_FIELDS 10
-
- static char legal_day[] = "SunMonTueWedThuFriSat";
- static char legal_month[] = "JanFebMarAprMayJunJulAugSepOctNovDec";
- static int legal_numbers[] = { 1, 31, 0, 23, 0, 59, 0, 60, 1969, 2199 };
-
- int is_mail_from_line(line)
- char *line; /* Line of text to be checked */
- {
- char *fields[MAX_FIELDS];
- char *sender_tail;
- register char *lp, **fp;
- register int n, i;
-
- if (strncmp(line, "From ", 5)) return -100;
-
- lp = line + 5;
- /* sender day mon dd hh:mm:ss year */
- for (n = 0, fp = fields; n < MAX_FIELDS; n++) {
- while (*lp && *lp != '\n' && isascii(*lp) && isspace(*lp)) lp++;
- if (*lp == '\0' || *lp == '\n') break;
- *fp++ = lp;
- while (*lp && isascii(*lp) && !isspace(*lp))
- if (*lp++ == ':' && (n == 4 || n == 5)) break;
- if (n == 0) sender_tail = lp;
- }
-
- if (n < 8) return -200-n;
-
- fp = fields;
-
- if (n > 8 && !isdigit(fp[7][0])) fp[7] = fp[8]; /* ... TZ year */
- if (n > 9 && !isdigit(fp[7][0])) fp[7] = fp[9]; /* ... TZ DST year */
-
- fp++;
- for (i = 0; i < 21; i += 3)
- if (strncmp(*fp, &legal_day[i], 3) == 0) break;
- if (i == 21) return -1;
-
- fp++;
- for (i = 0; i < 36; i += 3)
- if (strncmp(*fp, &legal_month[i], 3) == 0) break;
- if (i == 36) return -2;
-
- for (i = 0; i < 10; i += 2) {
- lp = *++fp;
- if (!isdigit(*lp)) return -20-i;
- n = atoi(lp);
- if (n < legal_numbers[i] || legal_numbers[i+1] < n) return -10-i;
- }
- return 0;
- }
-
-
-
- /*
- * Return the basename of a filename string, i.e. everything
- * after the last "/" character.
- */
-
- char *mtm_basename(string)
- char *string;
- {
- static char *buff;
- buff = string + strlen(string); /* start at last char */
- while (*buff != '/' && buff > string)
- buff--;
- return( (char *) (*buff == '/'? ++buff : buff));
- }
-