236 lines
6.6 KiB
C
236 lines
6.6 KiB
C
/*****************************************************************************
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*
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* $Id: openfile.c,v 1.14 2008/11/26 22:01:01 mbse Exp $
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* Purpose ...............: Fidonet mailer
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*
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*****************************************************************************
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* Copyright (C) 1997-2008
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*
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* Michiel Broek FIDO: 2:280/2802
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* Beekmansbos 10
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* 1971 BV IJmuiden
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* the Netherlands
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*
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* This file is part of MBSE BBS.
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*
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* This BBS is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* MBSE BBS is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with MBSE BBS; see the file COPYING. If not, write to the Free
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* Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*****************************************************************************/
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#include "../config.h"
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#include "../lib/mbselib.h"
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#include "config.h"
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#include "lutil.h"
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#include "openfile.h"
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static FILE *infp=NULL;
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static char *infpath=NULL;
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static time_t intime;
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static int isfreq;
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char *freqname=NULL;
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int gotfiles = FALSE;
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extern char *tempinbound;
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/*
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* Try to find present (probably incomplete) file with the same timestamp
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* (it might be renamed), open it for append and store resync offset.
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* Store 0 in resync offset if the file is new. Return FILE* or NULL.
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* resync() must accept offset in bytes and return 0 on success, nonzero
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* otherwise (and then the file will be open for write). For Zmodem,
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* resync is always possible, but for SEAlink it is not. Do not try
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* any resyncs if remsize == 0.
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*/
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FILE *openfile(char *fname, time_t remtime, off_t remsize, off_t *resofs, int(*resync)(off_t))
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{
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char *opentype, *p, x, ctt[32], tmpfname[16];
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int rc, rsc, ncount;
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struct stat st;
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strcpy(ctt,date(remtime));
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Syslog('s', "openfile(\"%s\",%s,%lu,...)", MBSE_SS(fname), ctt, (unsigned int)remsize);
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if ((fname == NULL) || (fname[0] == '\0')) {
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snprintf(tmpfname,16,"%08x.pkt",sequencer());
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fname=tmpfname;
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}
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if ((strlen(fname) == 12) && (strspn(fname,"0123456789abcdefABCDEF") == 8) && (strcasecmp(fname+8,".req") == 0)) {
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Syslog('s', "Received wazoo freq file");
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isfreq = TRUE;
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} else
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isfreq = FALSE;
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/*
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* First check if the file is already in the inbound directory.
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* If it's there, resoffs will be set equal to remsize to signal the
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* receiving protocol to skip the file.
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*/
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if (tempinbound == NULL) {
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/*
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* This is when we get a FTS-0001 handshake packet
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*/
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infpath = xstrcpy(CFG.inbound);
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infpath = xstrcat(infpath, (char *)"/tmp/");
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mkdirs(infpath, 0700);
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} else {
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infpath = xstrcpy(tempinbound);
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infpath = xstrcat(infpath, (char *)"/");
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}
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infpath = xstrcat(infpath, fname);
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if (stat(infpath, &st) == 0) {
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Syslog('s', "remtine=%ld, st_time=%ld, remsize=%ld, st_size=%ld", remtime, st.st_mtime, remsize, st.st_size);
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if ((remtime == st.st_mtime) && (remsize == st.st_size)) {
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Syslog('+', "File %s is already here", fname);
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*resofs = st.st_size;
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free(infpath);
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infpath = NULL;
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return NULL;
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}
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}
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/*
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* If the file is in the inbound with a zero length, erase the
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* file as if it wasn't there at all.
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*/
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if (((rc = stat(infpath, &st)) == 0) && (st.st_size == 0)) {
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Syslog('+', "Zero bytes file in the inbound, unlinking");
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unlink(infpath);
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}
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/*
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* If the file is not already in the inbound, but there is a file
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* with the same name, the new file will be renamed if the file
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* has another timestamp as the file we expect.
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*
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* Renaming algorythm is as follows: start with the present name,
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* increase the last character of the file name, jumping from
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* '9' to 'a', from 'z' to 'A', from 'Z' to '0'. If _all_ these
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* names are occupied, create random name.
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*/
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p = infpath + strlen(infpath) -1;
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x = *p;
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ncount = 0;
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while (((rc = stat(infpath, &st)) == 0) && (remtime != st.st_mtime) && (ncount++ < 62)) {
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if (x == '9')
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x = 'a';
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else if (x == 'z')
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x = 'A';
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else if (x == 'Z')
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x = '0';
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else
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x++;
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*p = x;
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}
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if (ncount >= 62) { /* names exhausted */
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rc = 1;
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p = strrchr(infpath,'/');
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*p = '\0';
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snprintf(ctt,32,"%08x.doe",sequencer());
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free(infpath);
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infpath = xstrcpy(p);
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infpath = xstrcat(infpath, ctt);
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}
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if (ncount)
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Syslog('s', "File renamed to %s", infpath);
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*resofs = 0L;
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opentype = (char *)"w";
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if ((rc == 0) && (remsize != 0)) {
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rsc = resync(st.st_size);
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Syslog('s', "resync(%d) rsc=%d", (int)st.st_size, rsc);
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switch (rsc) {
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case 0: /* Success */
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opentype = (char *)"a+";
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*resofs = st.st_size;
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Syslog('+', "Resyncing at offset %lu of \"%s\"", (unsigned int)st.st_size, infpath);
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break;
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case -1: /* Binkp did send a GET, return here and do not open file */
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free(infpath);
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infpath = NULL;
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return NULL;
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default: /* Error from xmrecv, do nothing */
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break;
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}
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}
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Syslog('s', "try fopen(\"%s\",\"%s\")", infpath, opentype);
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if ((infp = fopen(infpath, opentype)) == NULL) {
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WriteError("$Cannot open local file \"%s\" for \"%s\"", infpath,opentype);
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free(infpath);
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infpath=NULL;
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return NULL;
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}
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intime = remtime;
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if (isfreq) {
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if (freqname)
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free(freqname);
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freqname = xstrcpy(infpath);
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}
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Syslog('s', "opened file \"%s\" for \"%s\", restart at %lu", infpath,opentype,(unsigned int)*resofs);
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return infp;
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}
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/*
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* close file, even if the file is partial received, we set the date on the
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* file so that in a next session we know we must append to that file instead of
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* trying to get the file again.
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*/
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int closefile(void)
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{
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int rc = 0;
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struct utimbuf ut;
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Syslog('s', "closefile(), for file \"%s\"", MBSE_SS(infpath));
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if ((infp == NULL) || (infpath == NULL)) {
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Syslog('+', "closefile(), nothing to close");
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return 1;
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}
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rc = fclose(infp);
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infp = NULL;
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if (rc == 0) {
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ut.actime = intime;
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ut.modtime = intime;
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if ((rc = utime(infpath,&ut)))
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WriteError("$utime failed");
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}
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if (isfreq) {
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if (rc != 0) {
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Syslog('+', "Removing unsuccessfuly received wazoo freq");
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unlink(freqname);
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free(freqname);
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freqname=NULL;
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}
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isfreq = FALSE;
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}
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free(infpath);
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infpath = NULL;
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return rc;
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}
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