Ultrix-3.1/src/cmd/mail.c
/**********************************************************************
* Copyright (c) Digital Equipment Corporation 1984, 1985, 1986. *
* All Rights Reserved. *
* Reference "/usr/src/COPYRIGHT" for applicable restrictions. *
**********************************************************************/
static char Sccsid[] = "@(#)mail.c 3.0 4/21/86";
/* Based on: @(#)mail.c 1.4 (ULTRIX-32) 12/10/84 */
/*
* "binmail" /usr/binmail
*
* "@(#)mail.c 4.18 (Berkeley) 9/9/83";
*
* bagwill 8/5/85 -- ported to ULTRIX-11
*
* aps00 10/26/83 -- added check for UID of uucp otherwise, would
* fail if mail is comming from off system,
* via uucp.
* 02-Apr-84 mah. Fix for ghostname for queued file. This
* is to reflect 4.21 (Berkeley).
*
*/
#include <ctype.h>
#include <stdio.h>
#include <pwd.h>
#include <utmp.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <setjmp.h>
#include "sysexits.h"
#define SENDMAIL "/usr/lib/sendmail"
#define BINMAIL "/bin/mail"
/*copylet flags */
/*remote mail, add rmtmsg */
#define REMOTE 1
/* zap header and trailing empty line */
#define ZAP 3
#define ORDINARY 2
#define FORWARD 4
#define LSIZE 256
#define MAXLET 300 /* maximum number of letters */
#define MAILMODE (~0600) /* mode of created mail */
char line[LSIZE];
char resp[LSIZE];
struct let {
long adr;
char change;
} let[MAXLET];
int nlet = 0;
char lfil[50];
long iop, time();
char *getenv();
char *index();
char lettmp[] = "/tmp/maXXXXX";
char maildir[] = "/usr/spool/mail/";
char mailfile[] = "/usr/spool/mail/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
char dead[] = "dead.letter";
char *netname = "pdp";
char forwmsg[] = " forwarded\n";
FILE *tmpf;
FILE *malf;
char *my_name;
char *getlogin();
struct passwd *getpwuid();
int error;
int changed;
int forward;
char from[] = "From ";
long ftell();
int delete();
char *ctime();
int flgf;
int flgp;
int delflg = 1;
int hseqno;
jmp_buf sjbuf;
int rmail;
main(argc, argv)
char **argv;
{
register i;
char sobuf[BUFSIZ];
setbuf(stdout, sobuf);
mktemp(lettmp);
unlink(lettmp);
my_name = getlogin();
if (my_name == NULL || strlen(my_name) == 0) {
struct passwd *pwent;
pwent = getpwuid(getuid());
if (pwent==NULL)
my_name = "???";
else
my_name = pwent->pw_name;
}
if(setjmp(sjbuf)) done();
for (i=SIGHUP; i<=SIGTERM; i++)
setsig(i, delete);
tmpf = fopen(lettmp, "w");
if (tmpf == NULL) {
fprintf(stderr, "mail: cannot open %s for writing\n", lettmp);
done();
}
if (argv[0][0] == 'r')
rmail++;
/*
* If called with first arg == "-i", then we were
* originally targeted for sendmail, ("-i" is always
* set up by UCB Mail if targeting for sendmail),
* but for some reason the sendmail exec failed and
* we ended up here. This is why "-i" is required
* below, in addition to the original "rhd" flags.
*/
if (argv[0][0] != 'r' && /* no favors for rmail*/
(argc == 1 || argv[1][0] == '-' && !any(argv[1][1], "irhd")))
printmail(argc, argv);
else
bulkmail(argc, argv);
done();
}
setsig(i, f)
int i;
int (*f)();
{
if(signal(i, SIG_IGN)!=SIG_IGN)
signal(i, f);
}
any(c, str)
register int c;
register char *str;
{
while (*str)
if (c == *str++)
return(1);
return(0);
}
printmail(argc, argv)
char **argv;
{
int flg, i, j, print;
char *p, *getarg();
struct stat statb;
setuid(getuid());
cat(mailfile, maildir, my_name);
if (stat(mailfile, &statb) >= 0
&& (statb.st_mode & S_IFMT) == S_IFDIR) {
strcat(mailfile, "/");
strcat(mailfile, my_name);
}
for (; argc>1; argv++, argc--) {
if (argv[1][0]=='-') {
if (argv[1][1]=='q')
delflg = 0;
else if (argv[1][1]=='p') {
flgp++;
delflg = 0;
} else if (argv[1][1]=='f') {
if (argc>=3) {
strcpy(mailfile, argv[2]);
argv++;
argc--;
}
} else if (argv[1][1]=='r') {
forward = 1;
} else if (argv[1][1]=='h') {
forward = 1;
} else {
fprintf(stderr, "mail: unknown option %c\n", argv[1][1]);
done();
}
} else
break;
}
malf = fopen(mailfile, "r");
if (malf == NULL) {
fprintf(stdout, "No mail.\n");
return;
}
lock(mailfile);
copymt(malf, tmpf);
fclose(malf);
fclose(tmpf);
unlock();
tmpf = fopen(lettmp, "r");
changed = 0;
print = 1;
for (i = 0; i < nlet; ) {
j = forward ? i : nlet - i - 1;
if(setjmp(sjbuf)) {
print=0;
} else {
if (print)
copylet(j, stdout, ORDINARY);
print = 1;
}
if (flgp) {
i++;
continue;
}
setjmp(sjbuf);
fprintf(stdout, "? ");
fflush(stdout);
if (fgets(resp, LSIZE, stdin) == NULL)
break;
switch (resp[0]) {
default:
fprintf(stderr, "usage\n");
case '?':
print = 0;
fprintf(stderr, "q\tquit\n");
fprintf(stderr, "x\texit without changing mail\n");
fprintf(stderr, "p\tprint\n");
fprintf(stderr, "s[file]\tsave (default mbox)\n");
fprintf(stderr, "w[file]\tsame without header\n");
fprintf(stderr, "-\tprint previous\n");
fprintf(stderr, "d\tdelete\n");
fprintf(stderr, "+\tnext (no delete)\n");
fprintf(stderr, "m user\tmail to user\n");
fprintf(stderr, "! cmd\texecute cmd\n");
break;
case '+':
case 'n':
case '\n':
i++;
break;
case 'x':
changed = 0;
case 'q':
goto donep;
case 'p':
break;
case '^':
case '-':
if (--i < 0)
i = 0;
break;
case 'y':
case 'w':
case 's':
flg = 0;
if (resp[1] != '\n' && resp[1] != ' ') {
printf("illegal\n");
flg++;
print = 0;
continue;
}
if (resp[1] == '\n' || resp[1] == '\0') {
p = getenv("HOME");
if(p != 0)
cat(resp+1, p, "/mbox");
else
cat(resp+1, "", "mbox");
}
for (p = resp+1; (p = getarg(lfil, p)) != NULL; ) {
malf = fopen(lfil, "a");
if (malf == NULL) {
fprintf(stdout, "mail: cannot append to %s\n", lfil);
flg++;
continue;
}
copylet(j, malf, resp[0]=='w'? ZAP: ORDINARY);
fclose(malf);
}
if (flg)
print = 0;
else {
let[j].change = 'd';
changed++;
i++;
}
break;
case 'm':
flg = 0;
if (resp[1] == '\n' || resp[1] == '\0') {
i++;
continue;
}
if (resp[1] != ' ') {
printf("invalid command\n");
flg++;
print = 0;
continue;
}
for (p = resp+1; (p = getarg(lfil, p)) != NULL; )
if (!sendrmt(j, lfil, "/bin/mail")) /* couldn't send it */
flg++;
if (flg)
print = 0;
else {
let[j].change = 'd';
changed++;
i++;
}
break;
case '!':
system(resp+1);
printf("!\n");
print = 0;
break;
case 'd':
let[j].change = 'd';
changed++;
i++;
if (resp[1] == 'q')
goto donep;
break;
}
}
donep:
if (changed)
copyback();
}
copyback() /* copy temp or whatever back to /usr/spool/mail */
{
register i, n, c;
int new = 0;
struct stat stbuf;
signal(SIGINT, SIG_IGN);
signal(SIGHUP, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
lock(mailfile);
stat(mailfile, &stbuf);
if (stbuf.st_size != let[nlet].adr) { /* new mail has arrived */
malf = fopen(mailfile, "r");
if (malf == NULL) {
fprintf(stdout, "mail: can't re-read %s\n", mailfile);
done();
}
fseek(malf, let[nlet].adr, 0);
fclose(tmpf);
tmpf = fopen(lettmp, "a");
fseek(tmpf, let[nlet].adr, 0);
while ((c = fgetc(malf)) != EOF)
fputc(c, tmpf);
fclose(malf);
fclose(tmpf);
tmpf = fopen(lettmp, "r");
let[++nlet].adr = stbuf.st_size;
new = 1;
}
malf = fopen(mailfile, "w");
if (malf == NULL) {
fprintf(stderr, "mail: can't rewrite %s\n", lfil);
done();
}
n = 0;
for (i = 0; i < nlet; i++)
if (let[i].change != 'd') {
copylet(i, malf, ORDINARY);
n++;
}
fclose(malf);
if (new)
fprintf(stdout, "new mail arrived\n");
unlock();
}
copymt(f1, f2) /* copy mail (f1) to temp (f2) */
FILE *f1, *f2;
{
long nextadr;
nlet = nextadr = 0;
let[0].adr = 0;
while (fgets(line, LSIZE, f1) != NULL) {
if (isfrom(line))
let[nlet++].adr = nextadr;
nextadr += strlen(line);
fputs(line, f2);
}
let[nlet].adr = nextadr; /* last plus 1 */
}
copylet(n, f, type)
FILE *f;
{
int ch;
long k;
fseek(tmpf, let[n].adr, 0);
k = let[n+1].adr - let[n].adr;
while(k-- > 1 && (ch=fgetc(tmpf))!='\n')
if(type!=ZAP) fputc(ch,f);
if(type==REMOTE) {
char hostname[32];
ghostname(hostname, sizeof (hostname));
fprintf(f, " remote from %s\n", hostname);
} else if (type==FORWARD)
fprintf(f, forwmsg);
else if(type==ORDINARY)
fputc(ch,f);
while(k-->1)
fputc(ch=fgetc(tmpf), f);
if(type!=ZAP || ch!= '\n')
fputc(fgetc(tmpf), f);
}
isfrom(lp)
register char *lp;
{
register char *p;
for (p = from; *p; )
if (*lp++ != *p++)
return(0);
return(1);
}
bulkmail(argc, argv)
char **argv;
{
char truename[100];
int first;
register char *cp;
int gaver = 0;
char *newargv[1000];
register char **ap;
register char **vp;
int dflag;
dflag = 0;
if (argc < 1)
fprintf(stderr, "puke\n");
for (vp = argv, ap = newargv + 1; (*ap = *vp++) != 0; ap++)
{
if (ap[0][0] == '-' && ap[0][1] == 'd')
dflag++;
}
if (!dflag)
{
/* give it to sendmail, rah rah! */
unlink(lettmp);
ap = newargv+1;
if (rmail)
*ap-- = "-s";
*ap = "-sendmail";
setuid(getuid());
execv(SENDMAIL, ap);
/* perror(SENDMAIL); */
/*
* sendmail exec failed for some reason (not
* enough memory?) so we call ourselves (binmail)
* with the "-d" flag (deliver directly).
*/
if (rmail) {
*ap++ = "send-mail"; /* overwrite "-sendmail" */
*ap = "-d"; /* overwrite "-s" with "-d" */
} else {
*ap-- = "-d"; /* overwrite "-sendmail" */
*ap = "send-mail"; /* "send-mail" prefix */
}
execv(BINMAIL, ap); /* call ourselves with "-d" */
perror(BINMAIL); /* will never happen */
exit(EX_UNAVAILABLE);
}
truename[0] = 0;
line[0] = '\0';
/*
* When we fall out of this, argv[1] should be first name,
* argc should be number of names + 1.
*/
while (argc > 1 && *argv[1] == '-') {
cp = *++argv;
argc--;
switch (cp[1]) {
case 'r':
if (argc <= 0) {
fprintf(stderr,
"r flag needs more arguments\n");
usage();
done();
}
gaver++;
strcpy(truename, argv[1]);
fgets(line, LSIZE, stdin);
if (strncmp("From", line, 4) == 0)
line[0] = '\0';
argv++;
argc--;
break;
case 'h':
if (argc <= 0) {
fprintf(stderr,
"h flag needs more arguments\n");
usage();
done();
}
hseqno = atoi(argv[1]);
argv++;
argc--;
break;
case 'd':
break;
/*
* These options are intended for sendmail (initiated
* from UCB Mail) but, upon reaching here, binmail
* couldn't handle them. This is because binmail was
* exec'd with same option letters as were originally
* intended for sendmail exec (following the failure
* of the sendmail exec). Since binmail did not under-
* stand these 3 flags, we now recognize them, and pass
* them through untouched (ie. ignore them).
*/
case 'i':
case 'm':
case 'v':
break;
default:
fprintf(stderr, "Unknown flag\n");
usage();
done();
}
}
if (argc <= 1) {
usage();
done();
}
if (gaver == 0)
strcpy(truename, my_name);
/*
if (argc > 4 && strcmp(argv[1], "-r") == 0) {
strcpy(truename, argv[2]);
argc -= 2;
argv += 2;
fgets(line, LSIZE, stdin);
if (strcmpn("From", line, 4) == 0)
line[0] = '\0';
} else
strcpy(truename, my_name);
*/
time(&iop);
fprintf(tmpf, "%s%s %s", from, truename, ctime(&iop));
iop = ftell(tmpf);
flgf = 1;
for (first = 1;; first = 0) {
if (first && line[0] == '\0' && fgets(line, LSIZE, stdin) == NULL)
break;
if (!first && fgets(line, LSIZE, stdin) == NULL)
break;
if (line[0] == '.' && line[1] == '\n' && isatty(fileno(stdin)))
break;
if (isfrom(line))
fputs(">", tmpf);
fputs(line, tmpf);
flgf = 0;
}
fputs("\n", tmpf);
nlet = 1;
let[0].adr = 0;
let[1].adr = ftell(tmpf);
fclose(tmpf);
if (flgf)
return;
tmpf = fopen(lettmp, "r");
if (tmpf == NULL) {
fprintf(stderr, "mail: cannot reopen %s for reading\n", lettmp);
return;
}
while (--argc > 0) {
if (!sendmail(0, *++argv, truename))
error++;
}
if (error && safefile(dead)) {
setuid(getuid());
malf = fopen(dead, "w");
if (malf == NULL) {
fprintf(stdout, "mail: cannot open %s\n", dead);
fclose(tmpf);
return;
}
copylet(0, malf, ZAP);
fclose(malf);
fprintf(stdout, "Mail saved in %s\n", dead);
}
fclose(tmpf);
}
sendrmt(n, name, rcmd)
char *name;
char *rcmd;
{
FILE *rmf, *popen();
register char *p;
char rsys[64], cmd[64];
register local, pid;
int sts;
local = 0;
if (index(name, '^')) {
while (p = index(name, '^'))
*p = '!';
if (strncmp(name, "researc", 7)) {
strcpy(rsys, "research");
if (*name != '!')
--name;
goto skip;
}
}
if (*name=='!')
name++;
for(p=rsys; *name!='!'; *p++ = *name++)
if (*name=='\0') {
local++;
break;
}
*p = '\0';
if ((!local && *name=='\0') || (local && *rsys=='\0')) {
fprintf(stdout, "null name\n");
return(0);
}
skip:
if ((pid = fork()) == -1) {
fprintf(stderr, "mail: can't create proc for remote\n");
return(0);
}
if (pid) {
while (wait(&sts) != pid) {
if (wait(&sts)==-1)
return(0);
}
return(!sts);
}
setuid(getuid());
if (local)
sprintf(cmd, "%s %s", rcmd, rsys);
else {
if (index(name+1, '!'))
sprintf(cmd, "uux - %s!rmail \\(%s\\)", rsys, name+1);
else
sprintf(cmd, "uux - %s!rmail %s", rsys, name+1);
}
if ((rmf=popen(cmd, "w")) == NULL)
exit(1);
copylet(n, rmf, local ? !strcmp(rcmd, "/bin/mail") ? FORWARD : ORDINARY : REMOTE);
exit(pclose(rmf) != 0);
}
usage()
{
error = EX_USAGE; /* I can't believe they forgot this */
fprintf(stderr, "Usage: mail [ -f ] people . . .\n");
}
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
struct sockaddr_in biffaddr;
sendmail(n, name, fromaddr)
int n;
char *name;
char *fromaddr;
{
char file[100];
register char *p;
register mask;
struct passwd *pw, *getpwnam();
struct stat statb;
char buf[128];
int f;
struct hostent *hp = NULL;
struct servent *sp = NULL;
for(p=name; *p!='!'&&*p!='^' &&*p!='\0'; p++)
;
if (*p == '!'|| *p=='^')
return(sendrmt(n, name, 0));
if ((pw = getpwnam(name)) == NULL) {
fprintf(stdout, "mail: can't send to %s\n", name);
return(0);
}
cat(file, maildir, name);
if (stat(file, &statb) >= 0 && (statb.st_mode & S_IFMT) == S_IFDIR) {
strcat(file, "/");
strcat(file, name);
}
mask = umask(MAILMODE);
if (!safefile(file))
return(0);
lock(file);
malf = fopen(file, "a");
umask(mask);
if (malf == NULL) {
unlock();
fprintf(stdout, "mail: cannot append to %s\n", file);
return(0);
}
chown(file, pw->pw_uid, pw->pw_gid);
{
char hostbuf[256];
ghostname(hostbuf, sizeof (hostbuf));
hp = gethostbyname(hostbuf);
sp = getservbyname("biff", "udp");
if (hp && sp) {
f = socket(AF_INET, SOCK_DGRAM, 0, 0);
sprintf(buf, "%s@%d\n", name, ftell(malf));
}
}
copylet(n, malf, ORDINARY);
fclose(malf);
if (hp && sp) {
biffaddr.sin_family = hp->h_addrtype;
bcopy(hp->h_addr, &biffaddr.sin_addr, hp->h_length);
biffaddr.sin_port = sp->s_port;
sendto(f, buf, strlen(buf)+1, 0, &biffaddr, sizeof (biffaddr));
close(f);
}
unlock();
return(1);
}
delete(i)
{
setsig(i, delete);
fprintf(stderr, "\n");
if(delflg)
longjmp(sjbuf, 1);
done();
}
/*
* Lock the specified mail file by setting the file mailfile.lock.
* We must, of course, be careful to unlink the lock file by a call
* to unlock before we stop. The algorithm used here is to see if
* the lock exists, and if it does, to check its modify time. If it
* is older than 30 seconds, we assume error and set our own file.
* Otherwise, we wait for 5 seconds and try again.
*/
char *maillock = ".lock"; /* Lock suffix for mailname */
char *lockname = "/usr/spool/mail/tmXXXXXX";
char locktmp[30]; /* Usable lock temporary */
char curlock[50]; /* Last used name of lock */
int locked; /* To note that we locked it */
lock(file)
char *file;
{
register int f;
struct stat sbuf;
long curtime;
int statfailed;
if (locked || flgf)
return(0);
strcpy(curlock, file);
strcat(curlock, maillock);
strcpy(locktmp, lockname);
mktemp(locktmp);
unlink(locktmp);
statfailed = 0;
for (;;) {
f = lock1(locktmp, curlock);
if (f == 0) {
locked = 1;
return(0);
}
if (stat(curlock, &sbuf) < 0) {
if (statfailed++ > 5)
return(-1);
sleep(5);
continue;
}
statfailed = 0;
time(&curtime);
if (curtime < sbuf.st_ctime + 30) {
sleep(5);
continue;
}
unlink(curlock);
}
}
/*
* Remove the mail lock, and note that we no longer
* have it locked.
*/
unlock()
{
unlink(curlock);
locked = 0;
}
/*
* Attempt to set the lock by creating the temporary file,
* then doing a link/unlink. If it fails, return -1 else 0
*/
lock1(tempfile, name)
char tempfile[], name[];
{
register int fd;
fd = creat(tempfile, 0);
if (fd < 0)
return(-1);
close(fd);
if (link(tempfile, name) < 0) {
unlink(tempfile);
return(-1);
}
unlink(tempfile);
return(0);
}
done()
{
if(locked)
unlock();
unlink(lettmp);
unlink(locktmp);
exit(error);
}
cat(to, from1, from2)
char *to, *from1, *from2;
{
int i, j;
j = 0;
for (i=0; from1[i]; i++)
to[j++] = from1[i];
for (i=0; from2[i]; i++)
to[j++] = from2[i];
to[j] = 0;
}
char *getarg(s, p) /* copy p... into s, update p */
register char *s, *p;
{
while (*p == ' ' || *p == '\t')
p++;
if (*p == '\n' || *p == '\0')
return(NULL);
while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0')
*s++ = *p++;
*s = '\0';
return(p);
}
safefile(f)
char *f;
{
struct stat statb;
if (lstat(f, &statb) < 0)
return (1);
if (statb.st_nlink != 1 || (statb.st_mode & S_IFMT) == S_IFLNK) {
fprintf(stderr, "mail: %s has more than one link or is a symbolic link\n", f);
return (0);
}
return (1);
}