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NetBSD/usr.bin/msgs/msgs.c

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/* $NetBSD: msgs.c,v 1.24 2015/12/31 01:16:47 dholland Exp $ */
/*-
* Copyright (c) 1980, 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/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1980, 1993\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)msgs.c 8.2 (Berkeley) 4/28/95";
#else
__RCSID("$NetBSD: msgs.c,v 1.24 2015/12/31 01:16:47 dholland Exp $");
#endif
#endif /* not lint */
/*
* msgs - a user bulletin board program
*
* usage:
* msgs [fhlopqr] [[-]number] to read messages
* msgs -s to place messages
* msgs -c [-days] to clean up the bulletin board
*
* prompt commands are:
* y print message
* n flush message, go to next message
* q flush message, quit
* p print message, turn on 'pipe thru more' mode
* P print message, turn off 'pipe thru more' mode
* - reprint last message
* s[-][<num>] [<filename>] save message
* m[-][<num>] mail with message in temp mbox
* x exit without flushing this message
* <num> print message number <num>
*/
#define V7 /* will look for TERM in the environment */
#define OBJECT /* will object to messages without Subjects */
#define REJECT /* will reject messages without Subjects
(OBJECT must be defined also) */
/*#define UNBUFFERED */ /* use unbuffered output */
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <ctype.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <pwd.h>
#include <setjmp.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termcap.h>
#include <termios.h>
#include <time.h>
#include <unistd.h>
#include "pathnames.h"
#define CMODE 0664 /* bounds file creation mode */
#define NO 0
#define YES 1
#define SUPERUSER 0 /* superuser uid */
#define DAEMON 1 /* daemon uid */
#define NLINES 24 /* default number of lines/crt screen */
#define NDAYS 21 /* default keep time for messages */
#define DAYS *24*60*60 /* seconds/day */
#define MSGSRC ".msgsrc" /* user's rc file */
#define BOUNDS "bounds" /* message bounds file */
#define NEXT "Next message? [yq]"
#define MORE "More? [ynq]"
#define NOMORE "(No more) [q] ?"
typedef char bool;
FILE *msgsrc;
FILE *newmsg;
const char *sep = "-";
char inbuf[BUFSIZ];
char fname[MAXPATHLEN];
char cmdbuf[MAXPATHLEN + 16];
char subj[128];
char from[128];
char date[128];
char *ptr;
char *in;
bool local;
bool ruptible;
bool totty;
bool seenfrom;
bool seensubj;
bool blankline;
bool printing = NO;
bool mailing = NO;
bool quitit = NO;
bool sending = NO;
bool intrpflg = NO;
bool restricted = NO;
int uid;
int msg;
int prevmsg;
int lct;
int nlines;
int Lpp = 0;
time_t t;
time_t keep;
void ask(const char *);
void gfrsub(FILE *);
int linecnt(FILE *);
int main(int, char *[]);
int next(char *, size_t);
char *nxtfld(char *);
void onintr(int);
void onsusp(int);
void prmesg(int);
/* option initialization */
bool hdrs = NO;
bool qopt = NO;
bool hush = NO;
bool send_msg = NO;
bool locomode = NO;
bool use_pager = NO;
bool clean = NO;
bool lastcmd = NO;
jmp_buf tstpbuf;
int
main(int argc, char *argv[])
{
bool newrc, already;
int rcfirst = 0; /* first message to print (from .rc) */
int rcback = 0; /* amount to back off of rcfirst */
int firstmsg, nextmsg, lastmsg = 0;
int blast = 0;
FILE *bounds;
struct passwd *pw;
#ifdef UNBUFFERED
setbuf(stdout, NULL);
#endif
time(&t);
setuid(uid = getuid());
ruptible = (signal(SIGINT, SIG_IGN) == SIG_DFL);
if (ruptible)
signal(SIGINT, SIG_DFL);
argc--, argv++;
while (argc > 0) {
if (isdigit((unsigned char)argv[0][0])) {/* starting message # */
rcfirst = atoi(argv[0]);
}
else if (isdigit((unsigned char)argv[0][1])) {/* backward offset */
rcback = atoi( &( argv[0][1] ) );
}
else {
ptr = *argv;
while (*ptr) switch (*ptr++) {
case '-':
break;
case 'c':
if (uid != SUPERUSER && uid != DAEMON) {
fprintf(stderr, "Sorry\n");
exit(1);
}
clean = YES;
break;
case 'f': /* silently */
hush = YES;
break;
case 'h': /* headers only */
hdrs = YES;
break;
case 'l': /* local msgs only */
locomode = YES;
break;
case 'o': /* option to save last message */
lastcmd = YES;
break;
case 'p': /* pipe thru 'more' during long msgs */
use_pager = YES;
break;
case 'q': /* query only */
qopt = YES;
break;
case 'r': /* restricted */
restricted = YES;
break;
case 's': /* sending TO msgs */
send_msg = YES;
break;
default:
fprintf(stderr,
"usage: msgs [cfhlopqrs] [[-]number]\n");
exit(1);
}
}
argc--, argv++;
}
/*
* determine current message bounds
*/
snprintf(fname, sizeof (fname), "%s/%s", _PATH_MSGS, BOUNDS);
bounds = fopen(fname, "r");
if (bounds != NULL) {
if (fscanf(bounds, "%d %d\n", &firstmsg, &lastmsg) < 2)
firstmsg = lastmsg = 0;
fclose(bounds);
blast = lastmsg; /* save upper bound */
}
if (clean)
keep = t - (rcback? rcback : NDAYS) DAYS;
if (clean || bounds == NULL) { /* relocate message bounds */
struct dirent *dp;
struct stat stbuf;
bool seenany = NO;
DIR *dirp;
dirp = opendir(_PATH_MSGS);
if (dirp == NULL) {
perror(_PATH_MSGS);
exit(errno);
}
chmod(fname, CMODE);
firstmsg = 32767;
lastmsg = 0;
for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)){
char *cp = dp->d_name;
int i = 0;
if (dp->d_ino == 0)
continue;
#ifndef __SVR4
if (dp->d_namlen == 0)
continue;
#endif
if (clean)
snprintf(inbuf, sizeof (inbuf), "%s/%s",
_PATH_MSGS, cp);
while (isdigit((unsigned char)*cp))
i = i * 10 + *cp++ - '0';
if (*cp)
continue; /* not a message! */
if (clean) {
if (stat(inbuf, &stbuf) != 0)
continue;
if (stbuf.st_mtime < keep
&& stbuf.st_mode&S_IWRITE) {
unlink(inbuf);
continue;
}
}
if (i > lastmsg)
lastmsg = i;
if (i < firstmsg)
firstmsg = i;
seenany = YES;
}
closedir(dirp);
if (!seenany) {
if (blast != 0) /* never lower the upper bound! */
lastmsg = blast;
firstmsg = lastmsg + 1;
}
else if (blast > lastmsg)
lastmsg = blast;
if (!send_msg) {
bounds = fopen(fname, "w");
if (bounds == NULL) {
perror(fname);
exit(errno);
}
chmod(fname, CMODE);
fprintf(bounds, "%d %d\n", firstmsg, lastmsg);
fclose(bounds);
}
}
if (send_msg) {
/*
* Send mode - place msgs in _PATH_MSGS
*/
bounds = fopen(fname, "w");
if (bounds == NULL) {
perror(fname);
exit(errno);
}
nextmsg = lastmsg + 1;
snprintf(fname, sizeof (fname), "%s/%d", _PATH_MSGS, nextmsg);
newmsg = fopen(fname, "w");
if (newmsg == NULL) {
perror(fname);
exit(errno);
}
chmod(fname, 0644);
fprintf(bounds, "%d %d\n", firstmsg, nextmsg);
fclose(bounds);
sending = YES;
if (ruptible)
signal(SIGINT, onintr);
if (isatty(fileno(stdin))) {
pw = getpwuid(uid);
if (!pw) {
fprintf(stderr, "Who are you?\n");
exit(1);
}
printf("Message %d:\nFrom %s %sSubject: ",
nextmsg, pw->pw_name, ctime(&t));
fflush(stdout);
fgets(inbuf, sizeof inbuf, stdin);
putchar('\n');
fflush(stdout);
fprintf(newmsg, "From %s %sSubject: %s\n",
ptr, ctime(&t), inbuf);
blankline = seensubj = YES;
}
else
blankline = seensubj = NO;
for (;;) {
fgets(inbuf, sizeof inbuf, stdin);
if (feof(stdin) || ferror(stdin))
break;
blankline = (blankline || (inbuf[0] == '\n'));
seensubj = (seensubj || (!blankline && (strncmp(inbuf, "Subj", 4) == 0)));
fputs(inbuf, newmsg);
}
#ifdef OBJECT
if (!seensubj) {
printf("NOTICE: Messages should have a Subject field!\n");
#ifdef REJECT
unlink(fname);
#endif
exit(1);
}
#endif
exit(ferror(stdin));
}
if (clean)
exit(0);
/*
* prepare to display messages
*/
totty = (isatty(fileno(stdout)) != 0);
use_pager = use_pager && totty;
{
char *home = getenv("HOME");
if(home == NULL || *home == '\0')
errx(1, "$HOME not set");
snprintf(fname, sizeof (fname), "%s/%s", home, MSGSRC);
}
msgsrc = fopen(fname, "r");
if (msgsrc) {
newrc = NO;
fscanf(msgsrc, "%d\n", &nextmsg);
fclose(msgsrc);
if (nextmsg > lastmsg+1) {
printf("Warning: bounds have been reset (%d, %d)\n",
firstmsg, lastmsg);
truncate(fname, (off_t)0);
newrc = YES;
}
else if (!rcfirst)
rcfirst = nextmsg - rcback;
}
else
newrc = YES;
msgsrc = fopen(fname, "r+");
if (msgsrc == NULL)
msgsrc = fopen(fname, "w");
if (msgsrc == NULL) {
perror(fname);
exit(errno);
}
if (rcfirst) {
if (rcfirst > lastmsg+1) {
printf("Warning: the last message is number %d.\n",
lastmsg);
rcfirst = nextmsg;
}
if (rcfirst > firstmsg)
firstmsg = rcfirst; /* don't set below first msg */
}
if (newrc) {
nextmsg = firstmsg;
fseek(msgsrc, 0L, 0);
fprintf(msgsrc, "%d\n", nextmsg);
fflush(msgsrc);
}
#ifdef V7
if (totty) {
struct winsize win;
if (ioctl(fileno(stdout), TIOCGWINSZ, &win) != -1)
Lpp = win.ws_row;
if (Lpp <= 0) {
if (tgetent(inbuf, getenv("TERM")) <= 0
|| (Lpp = tgetnum("li")) <= 0) {
Lpp = NLINES;
}
}
}
#endif
Lpp -= 6; /* for headers, etc. */
already = NO;
prevmsg = firstmsg;
printing = YES;
if (ruptible)
signal(SIGINT, onintr);
/*
* Main program loop
*/
for (msg = firstmsg; msg <= lastmsg; msg++) {
snprintf(fname, sizeof (fname), "%s/%d", _PATH_MSGS, msg);
newmsg = fopen(fname, "r");
if (newmsg == NULL)
continue;
gfrsub(newmsg); /* get From and Subject fields */
if (locomode && !local) {
fclose(newmsg);
continue;
}
if (qopt) { /* This has to be located here */
printf("There are new messages.\n");
exit(0);
}
if (already && !hdrs)
putchar('\n');
/*
* Print header
*/
if (totty)
signal(SIGTSTP, onsusp);
(void) setjmp(tstpbuf);
already = YES;
nlines = 2;
if (seenfrom) {
printf("Message %d:\nFrom %s %s", msg, from, date);
nlines++;
}
if (seensubj) {
printf("Subject: %s", subj);
nlines++;
}
else {
if (seenfrom) {
putchar('\n');
nlines++;
}
while (nlines < 6
&& fgets(inbuf, sizeof inbuf, newmsg)
&& inbuf[0] != '\n') {
fputs(inbuf, stdout);
nlines++;
}
}
lct = linecnt(newmsg);
if (lct)
printf("(%d%slines) ", lct, seensubj? " " : " more ");
if (hdrs) {
printf("\n-----\n");
fclose(newmsg);
continue;
}
/*
* Ask user for command
*/
if (totty)
ask(lct? MORE : (msg==lastmsg? NOMORE : NEXT));
else
inbuf[0] = 'y';
if (totty)
signal(SIGTSTP, SIG_DFL);
cmnd:
in = inbuf;
switch (*in) {
case 'x':
case 'X':
exit(0);
case 'q':
case 'Q':
quitit = YES;
printf("--Postponed--\n");
exit(0);
/* intentional fall-thru */
case 'n':
case 'N':
if (msg >= nextmsg) sep = "Flushed";
prevmsg = msg;
break;
case 'p':
case 'P':
use_pager = (*in++ == 'p');
/* intentional fallthru */
case '\n':
case 'y':
default:
if (*in == '-') {
msg = prevmsg-1;
sep = "replay";
break;
}
if (isdigit((unsigned char)*in)) {
msg = next(in, sizeof(inbuf) -
(in - inbuf));
sep = in;
break;
}
prmesg(nlines + lct + (seensubj? 1 : 0));
prevmsg = msg;
}
printf("--%s--\n", sep);
sep = "-";
if (msg >= nextmsg) {
nextmsg = msg + 1;
fseek(msgsrc, 0L, 0);
fprintf(msgsrc, "%d\n", nextmsg);
fflush(msgsrc);
}
if (newmsg)
fclose(newmsg);
if (quitit)
break;
}
/*
* Make sure .rc file gets updated
*/
if (--msg >= nextmsg) {
nextmsg = msg + 1;
fseek(msgsrc, 0L, 0);
fprintf(msgsrc, "%d\n", nextmsg);
fflush(msgsrc);
}
if (already && !quitit && lastcmd && totty) {
/*
* save or reply to last message?
*/
msg = prevmsg;
ask(NOMORE);
if (inbuf[0] == '-' || isdigit((unsigned char)inbuf[0]))
goto cmnd;
}
if (!(already || hush || qopt))
printf("No new messages.\n");
exit(0);
}
void
prmesg(int length)
{
FILE *outf;
char *env_pager;
if (use_pager && length > Lpp) {
signal(SIGPIPE, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
if ((env_pager = getenv("PAGER")) == NULL ||
env_pager[0] == '\0') {
snprintf(cmdbuf, sizeof(cmdbuf), "%s -z%d",
_PATH_PAGER, Lpp);
} else {
strlcpy(cmdbuf, env_pager, sizeof (cmdbuf));
}
outf = popen(cmdbuf, "w");
if (!outf)
outf = stdout;
else
setbuf(outf, NULL);
}
else
outf = stdout;
if (seensubj)
putc('\n', outf);
while (fgets(inbuf, sizeof inbuf, newmsg)) {
fputs(inbuf, outf);
if (ferror(outf)) {
clearerr(outf);
break;
}
}
if (outf != stdout) {
pclose(outf);
signal(SIGPIPE, SIG_DFL);
signal(SIGQUIT, SIG_DFL);
}
else {
fflush(stdout);
}
/* trick to force wait on output */
tcdrain(fileno(stdout));
}
void
onintr(int dummy)
{
signal(SIGINT, onintr);
if (mailing)
unlink(fname);
if (sending) {
unlink(fname);
puts("--Killed--");
exit(1);
}
if (printing) {
putchar('\n');
if (hdrs)
exit(0);
sep = "Interrupt";
if (newmsg)
fseek(newmsg, 0L, 2);
intrpflg = YES;
}
}
/*
* We have just gotten a susp. Suspend and prepare to resume.
*/
void
onsusp(int dummy)
{
signal(SIGTSTP, SIG_DFL);
sigsetmask(0);
kill(0, SIGTSTP);
signal(SIGTSTP, onsusp);
if (!mailing)
longjmp(tstpbuf, 0);
}
int
linecnt(FILE *f)
{
off_t oldpos = ftell(f);
int l = 0;
char lbuf[BUFSIZ];
while (fgets(lbuf, sizeof lbuf, f))
l++;
clearerr(f);
fseek(f, oldpos, 0);
return (l);
}
int
next(char *buf, size_t bufsiz)
{
int i;
sscanf(buf, "%d", &i);
snprintf(buf, bufsiz, "Goto %d", i);
return(--i);
}
void
ask(const char *prompt)
{
char inch;
int n, cmsg;
off_t oldpos;
FILE *cpfrom, *cpto;
printf("%s ", prompt);
fflush(stdout);
intrpflg = NO;
(void) fgets(inbuf, sizeof inbuf, stdin);
if ((n = strlen(inbuf)) > 0 && inbuf[n - 1] == '\n')
inbuf[n - 1] = '\0';
if (intrpflg)
inbuf[0] = 'x';
/*
* Handle 'mail' and 'save' here.
*/
if (((inch = inbuf[0]) == 's' || inch == 'm') && !restricted) {
if (inbuf[1] == '-')
cmsg = prevmsg;
else if (isdigit((unsigned char)inbuf[1]))
cmsg = atoi(&inbuf[1]);
else
cmsg = msg;
snprintf(fname, sizeof (fname), "%s/%d", _PATH_MSGS, cmsg);
oldpos = ftell(newmsg);
cpfrom = fopen(fname, "r");
if (!cpfrom) {
printf("Message %d not found\n", cmsg);
ask (prompt);
return;
}
if (inch == 's') {
in = nxtfld(inbuf);
if (*in) {
for (n=0; in[n] > ' '; n++) { /* sizeof fname? */
fname[n] = in[n];
}
fname[n] = '\0';
}
else
strlcpy(fname, "Messages", sizeof(fname));
}
else {
int fd;
strlcpy(fname, _PATH_TMP, sizeof(fname));
fd = mkstemp(fname);
if (fd == -1)
err(1, "mkstemp failed");
close(fd);
snprintf(cmdbuf, sizeof (cmdbuf), _PATH_MAIL, fname);
mailing = YES;
}
cpto = fopen(fname, "a");
if (!cpto) {
perror(fname);
mailing = NO;
fseek(newmsg, oldpos, 0);
fclose(cpfrom);
ask(prompt);
return;
}
while ((n = fread(inbuf, 1, sizeof inbuf, cpfrom)) != 0)
fwrite(inbuf, 1, n, cpto);
fclose(cpfrom);
fclose(cpto);
fseek(newmsg, oldpos, 0); /* reposition current message */
if (inch == 's')
printf("Message %d saved in \"%s\"\n", cmsg, fname);
else {
system(cmdbuf);
unlink(fname);
mailing = NO;
}
ask(prompt);
}
}
void
gfrsub(FILE *infile)
{
off_t frompos;
seensubj = seenfrom = NO;
local = YES;
subj[0] = from[0] = date[0] = 0;
/*
* Is this a normal message?
*/
if (fgets(inbuf, sizeof inbuf, infile)) {
if (strncmp(inbuf, "From", 4)==0) {
/*
* expected form starts with From
*/
seenfrom = YES;
frompos = ftell(infile);
ptr = from;
in = nxtfld(inbuf);
if (*in) while (*in && *in > ' ') {
if (*in == ':' || *in == '@' || *in == '!')
local = NO;
*ptr++ = *in++;
/* what about sizeof from ? */
}
*ptr = '\0';
if (*(in = nxtfld(in)))
strncpy(date, in, sizeof date);
else {
date[0] = '\n';
date[1] = '\0';
}
}
else {
/*
* not the expected form
*/
fseek(infile, 0L, 0);
return;
}
}
else
/*
* empty file ?
*/
return;
/*
* look for Subject line until EOF or a blank line
*/
while (fgets(inbuf, sizeof inbuf, infile)
&& !(blankline = (inbuf[0] == '\n'))) {
/*
* extract Subject line
*/
if (!seensubj && strncmp(inbuf, "Subj", 4)==0) {
seensubj = YES;
frompos = ftell(infile);
strncpy(subj, nxtfld(inbuf), sizeof subj);
}
}
if (!blankline)
/*
* ran into EOF
*/
fseek(infile, frompos, 0);
if (!seensubj)
/*
* for possible use with Mail
*/
strncpy(subj, "(No Subject)\n", sizeof subj);
}
char *
nxtfld(char *s)
{
if (*s) while (*s && *s > ' ') s++; /* skip over this field */
if (*s) while (*s && *s <= ' ') s++; /* find start of next field */
return (s);
}
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