File: [local] / src / usr.bin / from / from.c (download)
Revision 1.28, Mon Jul 12 15:09:19 2021 UTC (2 years, 10 months ago) by beck
Branch: MAIN
CVS Tags: OPENBSD_7_5_BASE, OPENBSD_7_5, OPENBSD_7_4_BASE, OPENBSD_7_4, OPENBSD_7_3_BASE, OPENBSD_7_3, OPENBSD_7_2_BASE, OPENBSD_7_2, OPENBSD_7_1_BASE, OPENBSD_7_1, OPENBSD_7_0_BASE, OPENBSD_7_0, HEAD Changes since 1.27: +2 -2 lines
Change the error reporting pattern throughout the tree when unveil
fails to report the path that the failure occured on. Suggested by
deraadt@ after some tech discussion.
Work done and verified by Ashton Fagg <ashton@fagg.id.au>
ok deraadt@ semarie@ claudio@
|
/* $OpenBSD: from.c,v 1.28 2021/07/12 15:09:19 beck Exp $ */
/* $NetBSD: from.c,v 1.6 1995/09/01 01:39:10 jtc Exp $ */
/*
* Copyright (c) 1980, 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/types.h>
#include <ctype.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <paths.h>
#include <string.h>
#include <err.h>
#include <errno.h>
int match(char *, char *);
char *mail_spool(char *file, const char *user);
int
main(int argc, char *argv[])
{
int ch, newline, fflag = 0;
char *file, *line, *sender, *p;
size_t linesize = 0;
ssize_t linelen;
FILE *fp;
file = line = sender = NULL;
while ((ch = getopt(argc, argv, "f:s:")) != -1) {
switch(ch) {
case 'f':
fflag = 1;
file = optarg;
break;
case 's':
sender = optarg;
for (p = sender; *p; ++p)
if (isupper((unsigned char)*p))
*p = tolower((unsigned char)*p);
break;
default:
fprintf(stderr,
"usage: from [-f file] [-s sender] [user]\n");
exit(EXIT_FAILURE);
}
}
argv += optind;
if (pledge("stdio unveil rpath getpw", NULL) == -1)
err(1, "pledge");
file = mail_spool(file, *argv);
if (unveil(file, "r") == -1)
err(1, "unveil %s", file);
if (pledge("stdio rpath", NULL) == -1)
err(1, "pledge");
if ((fp = fopen(file, "r")) == NULL) {
if (!fflag && errno == ENOENT)
exit(EXIT_SUCCESS);
err(1, "%s", file);
}
if (pledge("stdio", NULL) == -1)
err(1, "pledge");
for (newline = 1; (linelen = getline(&line, &linesize, fp)) != -1;) {
if (*line == '\n') {
newline = 1;
continue;
}
if (newline && !strncmp(line, "From ", 5) &&
(!sender || match(line + 5, sender)))
printf("%s", line);
newline = 0;
}
free(line);
if (ferror(fp))
err(EXIT_FAILURE, "getline");
fclose(fp);
exit(EXIT_SUCCESS);
}
char *
mail_spool(char *file, const char *user)
{
struct passwd *pwd;
/*
* We find the mailbox by:
* 1 -f flag
* 2 _PATH_MAILDIR/user (from argv)
* 2 MAIL environment variable
* 3 _PATH_MAILDIR/user (from environment or passwd db)
*/
if (file == NULL) {
if (user == NULL) {
if ((file = getenv("MAIL")) == NULL) {
if ((user = getenv("LOGNAME")) == NULL &&
(user = getenv("USER")) == NULL) {
if (!(pwd = getpwuid(getuid())))
errx(1, "no password file "
"entry for you");
user = pwd->pw_name;
}
}
}
if (file == NULL) {
if (asprintf(&file, "%s/%s", _PATH_MAILDIR, user) == -1)
err(1, NULL);
}
}
return(file);
}
int
match(char *line, char *sender)
{
char ch, pch, first, *p, *t;
for (first = *sender++;;) {
if (isspace((unsigned char)(ch = *line)))
return(0);
++line;
if (isupper((unsigned char)ch))
ch = tolower((unsigned char)ch);
if (ch != first)
continue;
for (p = sender, t = line;;) {
if (!(pch = *p++))
return(1);
if (isupper((unsigned char)(ch = *t++)))
ch = tolower((unsigned char)ch);
if (ch != pch)
break;
}
}
/* NOTREACHED */
}