V7M/src/cmd/mail.c
#include <stdio.h>
#include <pwd.h>
#include <utmp.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <setjmp.h>
#include <whoami.h>
/*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 (~0644) /* 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 lettmp[] = "/tmp/maXXXXX";
char maildir[] = "/usr/spool/mail/";
char mailfile[] = "/usr/spool/mail/xxxxxxxxxxxxxxxxxxxxxxx";
char dead[] = "dead.letter";
char *thissys = sysname;
char forwmsg[] = " forwarded\n";
char *curlock;
int lockerror;
FILE *tmpf;
FILE *malf;
char *my_name;
char *getlogin();
struct passwd *getpwuid();
int error;
int locked;
int changed;
int forward;
char from[] = "From ";
long ftell();
int delete();
char *ctime();
int flgf;
int flgp;
int delflg = 1;
jmp_buf sjbuf;
main(argc, argv)
char **argv;
{
register i;
char sobuf[BUFSIZ];
setbuf(stdout, sobuf);
mktemp(lettmp);
unlink(lettmp);
my_name = getlogin();
if (my_name == NULL) {
struct passwd *pwent;
pwent = getpwuid(getuid());
if (pwent==NULL)
my_name = "???";
else
my_name = pwent->pw_name;
}
if(setjmp(sjbuf)) done();
for (i=0; i<20; 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' && /* no favors for rmail*/
(argc == 1 || argv[1][0] == '-'))
printmail(argc, argv);
else
sendmail(argc, argv);
done();
}
setsig(i, f)
int i;
int (*f)();
{
if(signal(i, SIG_IGN)!=SIG_IGN)
signal(i, f);
}
printmail(argc, argv)
char **argv;
{
int flg, i, j, print;
char *p, *getarg();
setuid(getuid());
cat(mailfile, maildir, 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 {
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')
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)) /* 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)
fprintf(f, " remote from %s\n", thissys);
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);
}
sendmail(argc, argv)
char **argv;
{
time(&iop);
fprintf(tmpf, "%s%s %s", from, my_name, ctime(&iop));
iop = ftell(tmpf);
flgf = 1;
while (fgets(line, LSIZE, stdin) != NULL) {
if (line[0] == '.' && line[1] == '\n')
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 (!send(0, *++argv)) /* couldn't send to him */
error++;
if (error) {
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)
char *name;
{
FILE *rmf, *popen();
register char *p;
char rsys[64], cmd[64];
register local, pid;
int sts;
local = 0;
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);
}
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, "mail %s", 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? FORWARD: REMOTE);
pclose(rmf);
exit(0);
}
send(n, name) /* send letter n to name */
int n;
char *name;
{
char file[50];
register char *p;
register mask;
struct passwd *pw, *getpwnam();
for(p=name; *p!='!' &&*p!='\0'; p++)
;
if (*p == '!')
return(sendrmt(n, name));
if ((pw = getpwnam(name)) == NULL) {
fprintf(stdout, "mail: can't send to %s\n", name);
return(0);
}
cat(file, maildir, name);
mask = umask(MAILMODE);
malf = fopen(file, "a");
umask(mask);
if (malf == NULL) {
fprintf(stdout, "mail: cannot append to %s\n", file);
return(0);
}
lock(file);
chown(file, pw->pw_uid, pw->pw_gid);
copylet(n, malf, ORDINARY);
fclose(malf);
unlock();
return(1);
}
delete(i)
{
setsig(i, delete);
fprintf(stderr, "\n");
if(delflg)
longjmp(sjbuf, 1);
done();
}
done()
{
if(!lockerror)
unlock();
unlink(lettmp);
exit(error+lockerror);
}
lock(file)
char *file;
{
struct stat stbuf;
if (locked || flgf)
return;
if (stat(file, &stbuf)<0)
return;
if (stbuf.st_mode&01) { /* user x bit is the lock */
if (stbuf.st_ctime+60 >= time((long *)0)) {
fprintf(stderr, "%s busy; try again in a minute\n", file);
lockerror++;
done();
}
}
locked = stbuf.st_mode & ~01;
curlock = file;
chmod(file, stbuf.st_mode|01);
}
unlock()
{
if (locked)
chmod(curlock, locked);
locked = 0;
}
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);
}