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- /* movemail foo bar -- move file foo to file bar,
- locking file foo the way /bin/mail respects.
- Copyright (C) 1986 Free Software Foundation, Inc.
-
- This file is part of GNU Emacs.
-
- GNU Emacs is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 1, or (at your option)
- any later version.
-
- GNU Emacs is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with GNU Emacs; see the file COPYING. If not, write to
- the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /* Important notice: defining MAIL_USE_FLOCK *will cause loss of mail*
- if you do it on a system that does not normally use flock as its way of
- interlocking access to inbox files. The setting of MAIL_USE_FLOCK
- *must agree* with the system's own conventions.
- It is not a choice that is up to you.
-
- So, if your system uses lock files rather than flock, then the only way
- you can get proper operation is to enable movemail to write lockfiles there.
- This means you must either give that directory access modes
- that permit everyone to write lockfiles in it, or you must make movemail
- a setuid or setgid program. */
-
- /*
- * Modified January, 1986 by Michael R. Gretzinger (Project Athena)
- *
- * Added POP (Post Office Protocol) service. When compiled -DPOP
- * movemail will accept input filename arguments of the form
- * "po:username". This will cause movemail to open a connection to
- * a pop server running on $MAILHOST (environment variable). Movemail
- * must be setuid to root in order to work with POP.
- *
- * New module: popmail.c
- * Modified routines:
- * main - added code within #ifdef MAIL_USE_POP; added setuid (getuid ())
- * after POP code.
- * New routines in movemail.c:
- * get_errmsg - return pointer to system error message
- *
- */
-
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <sys/file.h>
- #include <errno.h>
- #define NO_SHORTNAMES /* Tell config not to load remap.h */
- #include "../src/config.h"
-
- #ifdef USG
- #include <fcntl.h>
- #include <unistd.h>
- #ifndef F_OK
- #define F_OK 0
- #define X_OK 1
- #define W_OK 2
- #define R_OK 4
- #endif
- #endif /* USG */
-
- #ifdef XENIX
- #include <sys/locking.h>
- #endif
-
- #ifdef MAIL_USE_MMDF
- extern int lk_open (), lk_close ();
- #endif
-
- /* Cancel substitutions made by config.h for Emacs. */
- #undef open
- #undef read
- #undef write
- #undef close
-
- char *concat ();
- extern int errno;
-
- /* Nonzero means this is name of a lock file to delete on fatal error. */
- char *delete_lockname;
-
- main (argc, argv)
- int argc;
- char **argv;
- {
- char *inname, *outname;
- int indesc, outdesc;
- char buf[1024];
- int nread;
-
- #ifndef MAIL_USE_FLOCK
- struct stat st;
- long now;
- int tem;
- char *lockname, *p;
- char *tempname;
- int desc;
- #endif /* not MAIL_USE_FLOCK */
-
- delete_lockname = 0;
-
- if (argc < 3)
- fatal ("two arguments required");
-
- inname = argv[1];
- outname = argv[2];
-
- #ifdef MAIL_USE_MMDF
- mmdf_init (argv[0]);
- #endif
-
- /* Check access to output file. */
- if (access (outname, F_OK) == 0 && access (outname, W_OK) != 0)
- pfatal_with_name (outname);
-
- /* Also check that outname's directory is writeable to the real uid. */
- {
- char *buf = (char *) malloc (strlen (outname) + 1);
- char *p, q;
- strcpy (buf, outname);
- p = buf + strlen (buf);
- while (p > buf && p[-1] != '/')
- *--p = 0;
- if (p == buf)
- *p++ = '.';
- if (access (buf, W_OK) != 0)
- pfatal_with_name (buf);
- free (buf);
- }
-
- #ifdef MAIL_USE_POP
- if (!bcmp (inname, "po:", 3))
- {
- int status; char *user;
-
- user = (char *) rindex (inname, ':') + 1;
- status = popmail (user, outname);
- exit (status);
- }
-
- setuid (getuid ());
- #endif /* MAIL_USE_POP */
-
- /* Check access to input file. */
- if (access (inname, R_OK | W_OK) != 0)
- pfatal_with_name (inname);
-
- #ifndef MAIL_USE_MMDF
- #ifndef MAIL_USE_FLOCK
- /* Use a lock file named /usr/spool/mail/$USER.lock:
- If it exists, the mail file is locked. */
- /* Note: this locking mechanism is *required* by the mailer
- (on systems which use it) to prevent loss of mail.
-
- On systems that use a lock file, extracting the mail without locking
- WILL occasionally cause loss of mail due to timing errors!
-
- So, if creation of the lock file fails
- due to access permission on /usr/spool/mail,
- you simply MUST change the permission
- and/or make movemail a setgid program
- so it can create lock files properly.
-
- You might also wish to verify that your system is one
- which uses lock files for this purpose. Some systems use other methods.
-
- If your system uses the `flock' system call for mail locking,
- define MAIL_USE_FLOCK in config.h or the s-*.h file
- and recompile movemail. If the s- file for your system
- should define MAIL_USE_FLOCK but does not, send a bug report
- to bug-gnu-emacs@prep.ai.mit.edu so we can fix it. */
-
- lockname = concat (inname, ".lock", "");
- tempname = (char *) xmalloc (strlen (inname) + 20);
- strcpy (tempname, inname);
- p = tempname + strlen (tempname);
- while (p != tempname && p[-1] != '/')
- p--;
- *p = 0;
- strcpy (p, "EXXXXXX");
- mktemp (tempname);
- unlink (tempname);
-
- while (1)
- {
- /* Create the lock file, but not under the lock file name. */
- /* Give up if cannot do that. */
- desc = open (tempname, O_WRONLY | O_CREAT, 0666);
- if (desc < 0)
- pfatal_with_name ("lock file--see source file etc/movemail.c");
- close (desc);
-
- tem = link (tempname, lockname);
- unlink (tempname);
- if (tem >= 0)
- break;
- sleep (1);
-
- /* If lock file is a minute old, unlock it. */
- if (stat (lockname, &st) >= 0)
- {
- now = time (0);
- if (st.st_ctime < now - 60)
- unlink (lockname);
- }
- }
-
- delete_lockname = lockname;
- #endif /* not MAIL_USE_FLOCK */
-
- #ifdef MAIL_USE_FLOCK
- indesc = open (inname, O_RDWR);
- #else /* if not MAIL_USE_FLOCK */
- indesc = open (inname, O_RDONLY);
- #endif /* not MAIL_USE_FLOCK */
- #else /* MAIL_USE_MMDF */
- indesc = lk_open (inname, O_RDONLY, 0, 0, 10);
- #endif /* MAIL_USE_MMDF */
-
- if (indesc < 0)
- pfatal_with_name (inname);
-
- #if defined (BSD) || defined (XENIX)
- /* In case movemail is setuid to root, make sure the user can
- read the output file. */
- /* This is desirable for all systems
- but I don't want to assume all have the umask system call */
- umask (umask (0) & 0333);
- #endif /* BSD or Xenix */
- outdesc = open (outname, O_WRONLY | O_CREAT | O_EXCL, 0666);
- if (outdesc < 0)
- pfatal_with_name (outname);
- #ifdef MAIL_USE_FLOCK
- #ifdef XENIX
- if (locking (indesc, LK_RLCK, 0L) < 0) pfatal_with_name (inname);
- #else
- if (flock (indesc, LOCK_EX) < 0) pfatal_with_name (inname);
- #endif
- #endif /* MAIL_USE_FLOCK */
-
- while (1)
- {
- nread = read (indesc, buf, sizeof buf);
- if (nread != write (outdesc, buf, nread))
- {
- int saved_errno = errno;
- unlink (outname);
- errno = saved_errno;
- pfatal_with_name (outname);
- }
- if (nread < sizeof buf)
- break;
- }
-
- #ifdef BSD
- if (fsync (outdesc) < 0)
- pfatal_and_delete (outname);
- #endif
-
- /* Check to make sure no errors before we zap the inbox. */
- if (close (outdesc) != 0)
- pfatal_and_delete (outname);
-
- #ifdef MAIL_USE_FLOCK
- #if defined (STRIDE) || defined (XENIX)
- /* Stride, xenix have file locking, but no ftruncate. This mess will do. */
- close (open (inname, O_CREAT | O_TRUNC | O_RDWR, 0666));
- #else
- ftruncate (indesc, 0L);
- #endif /* STRIDE or XENIX */
- #endif /* MAIL_USE_FLOCK */
-
- #ifdef MAIL_USE_MMDF
- lk_close (indesc, 0, 0, 0);
- #else
- close (indesc);
- #endif
-
- #ifndef MAIL_USE_FLOCK
- /* Delete the input file; if we can't, at least get rid of its contents. */
- if (unlink (inname) < 0)
- if (errno != ENOENT)
- creat (inname, 0666);
- #ifndef MAIL_USE_MMDF
- unlink (lockname);
- #endif /* not MAIL_USE_MMDF */
- #endif /* not MAIL_USE_FLOCK */
- exit (0);
- }
-
- /* Print error message and exit. */
-
- fatal (s1, s2)
- char *s1, *s2;
- {
- if (delete_lockname)
- unlink (delete_lockname);
- error (s1, s2);
- exit (1);
- }
-
- /* Print error message. `s1' is printf control string, `s2' is arg for it. */
-
- error (s1, s2, s3)
- char *s1, *s2, *s3;
- {
- printf ("movemail: ");
- printf (s1, s2, s3);
- printf ("\n");
- }
-
- pfatal_with_name (name)
- char *name;
- {
- extern int errno, sys_nerr;
- extern char *sys_errlist[];
- char *s;
-
- if (errno < sys_nerr)
- s = concat ("", sys_errlist[errno], " for %s");
- else
- s = "cannot open %s";
- fatal (s, name);
- }
-
- pfatal_and_delete (name)
- char *name;
- {
- extern int errno, sys_nerr;
- extern char *sys_errlist[];
- char *s;
-
- if (errno < sys_nerr)
- s = concat ("", sys_errlist[errno], " for %s");
- else
- s = "cannot open %s";
-
- unlink (name);
- fatal (s, name);
- }
-
- /* Return a newly-allocated string whose contents concatenate those of s1, s2, s3. */
-
- char *
- concat (s1, s2, s3)
- char *s1, *s2, *s3;
- {
- int len1 = strlen (s1), len2 = strlen (s2), len3 = strlen (s3);
- char *result = (char *) xmalloc (len1 + len2 + len3 + 1);
-
- strcpy (result, s1);
- strcpy (result + len1, s2);
- strcpy (result + len1 + len2, s3);
- *(result + len1 + len2 + len3) = 0;
-
- return result;
- }
-
- /* Like malloc but get fatal error if memory is exhausted. */
-
- int
- xmalloc (size)
- int size;
- {
- int result = malloc (size);
- if (!result)
- fatal ("virtual memory exhausted", 0);
- return result;
- }
-
- /* This is the guts of the interface to the Post Office Protocol. */
-
- #ifdef MAIL_USE_POP
-
- #include <sys/socket.h>
- #include <netinet/in.h>
- #include <netdb.h>
- #include <stdio.h>
- #include <pwd.h>
-
- #ifdef USG
- #include <fcntl.h>
- /* Cancel substitutions made by config.h for Emacs. */
- #undef open
- #undef read
- #undef write
- #undef close
- #endif /* USG */
-
- #define NOTOK (-1)
- #define OK 0
- #define DONE 1
-
- char *progname;
- FILE *sfi;
- FILE *sfo;
- char Errmsg[80];
-
- static int debug = 0;
-
- char *get_errmsg ();
- char *getenv ();
- int mbx_write ();
-
- popmail (user, outfile)
- char *user;
- char *outfile;
- {
- char *host;
- int nmsgs, nbytes;
- char response[128];
- register int i;
- int mbfi;
- FILE *mbf;
- struct passwd *pw = (struct passwd *) getpwuid (getuid ());
- if (pw == NULL)
- fatal ("cannot determine user name");
-
- host = getenv ("MAILHOST");
- if (host == NULL)
- {
- fatal ("no MAILHOST defined");
- }
-
- if (pop_init (host) == NOTOK)
- {
- fatal (Errmsg);
- }
-
- if (getline (response, sizeof response, sfi) != OK)
- {
- fatal (response);
- }
-
- if (pop_command ("USER %s", user) == NOTOK
- || pop_command ("RPOP %s", pw->pw_name) == NOTOK)
- {
- pop_command ("QUIT");
- fatal (Errmsg);
- }
-
- if (pop_stat (&nmsgs, &nbytes) == NOTOK)
- {
- pop_command ("QUIT");
- fatal (Errmsg);
- }
-
- if (!nmsgs)
- {
- pop_command ("QUIT");
- return 0;
- }
-
- mbfi = open (outfile, O_WRONLY | O_CREAT | O_EXCL, 0666);
- if (mbfi < 0)
- {
- pop_command ("QUIT");
- pfatal_and_delete (outfile);
- }
- fchown (mbfi, getuid (), -1);
-
- if ((mbf = fdopen (mbfi, "w")) == NULL)
- {
- pop_command ("QUIT");
- pfatal_and_delete (outfile);
- }
-
- for (i = 1; i <= nmsgs; i++)
- {
- mbx_delimit_begin (mbf);
- if (pop_retr (i, mbx_write, mbf) != OK)
- {
- pop_command ("QUIT");
- close (mbfi);
- unlink (outfile);
- fatal (Errmsg);
- }
- mbx_delimit_end (mbf);
- fflush (mbf);
- }
-
- if (fsync (mbfi) < 0)
- {
- pop_command ("QUIT");
- pfatal_and_delete (outfile);
- }
-
- if (close (mbfi) == -1)
- {
- pop_command ("QUIT");
- pfatal_and_delete (outfile);
- }
-
- for (i = 1; i <= nmsgs; i++)
- {
- if (pop_command ("DELE %d", i) == NOTOK)
- {
- /* Better to ignore this failure. */
- }
- }
-
- pop_command ("QUIT");
- return (0);
- }
-
- pop_init (host)
- char *host;
- {
- register struct hostent *hp;
- register struct servent *sp;
- int lport = IPPORT_RESERVED - 1;
- struct sockaddr_in sin;
- register int s;
-
- hp = gethostbyname (host);
- if (hp == NULL)
- {
- sprintf (Errmsg, "MAILHOST unknown: %s", host);
- return NOTOK;
- }
-
- sp = getservbyname ("pop", "tcp");
- if (sp == 0)
- {
- strcpy (Errmsg, "tcp/pop: unknown service");
- return NOTOK;
- }
-
- sin.sin_family = hp->h_addrtype;
- bcopy (hp->h_addr, (char *)&sin.sin_addr, hp->h_length);
- sin.sin_port = sp->s_port;
- s = rresvport (&lport);
- if (s < 0)
- {
- sprintf (Errmsg, "error creating socket: %s", get_errmsg ());
- return NOTOK;
- }
-
- if (connect (s, (char *)&sin, sizeof sin) < 0)
- {
- sprintf (Errmsg, "error during connect: %s", get_errmsg ());
- close (s);
- return NOTOK;
- }
-
- sfi = fdopen (s, "r");
- sfo = fdopen (s, "w");
- if (sfi == NULL || sfo == NULL)
- {
- sprintf (Errmsg, "error in fdopen: %s", get_errmsg ());
- close (s);
- return NOTOK;
- }
-
- return OK;
- }
-
- pop_command (fmt, a, b, c, d)
- char *fmt;
- {
- char buf[128];
- char errmsg[64];
-
- sprintf (buf, fmt, a, b, c, d);
-
- if (debug) fprintf (stderr, "---> %s\n", buf);
- if (putline (buf, Errmsg, sfo) == NOTOK) return NOTOK;
-
- if (getline (buf, sizeof buf, sfi) != OK)
- {
- strcpy (Errmsg, buf);
- return NOTOK;
- }
-
- if (debug)
- fprintf (stderr, "<--- %s\n", buf);
- if (*buf != '+')
- {
- strcpy (Errmsg, buf);
- return NOTOK;
- }
- else
- {
- return OK;
- }
- }
-
-
- pop_stat (nmsgs, nbytes)
- int *nmsgs, *nbytes;
- {
- char buf[128];
-
- if (debug)
- fprintf (stderr, "---> STAT\n");
- if (putline ("STAT", Errmsg, sfo) == NOTOK)
- return NOTOK;
-
- if (getline (buf, sizeof buf, sfi) != OK)
- {
- strcpy (Errmsg, buf);
- return NOTOK;
- }
-
- if (debug) fprintf (stderr, "<--- %s\n", buf);
- if (*buf != '+')
- {
- strcpy (Errmsg, buf);
- return NOTOK;
- }
- else
- {
- sscanf (buf, "+OK %d %d", nmsgs, nbytes);
- return OK;
- }
- }
-
- pop_retr (msgno, action, arg)
- int (*action)();
- {
- char buf[128];
-
- sprintf (buf, "RETR %d", msgno);
- if (debug) fprintf (stderr, "%s\n", buf);
- if (putline (buf, Errmsg, sfo) == NOTOK) return NOTOK;
-
- if (getline (buf, sizeof buf, sfi) != OK)
- {
- strcpy (Errmsg, buf);
- return NOTOK;
- }
-
- while (1)
- {
- switch (multiline (buf, sizeof buf, sfi))
- {
- case OK:
- (*action)(buf, arg);
- break;
- case DONE:
- return OK;
- case NOTOK:
- strcpy (Errmsg, buf);
- return NOTOK;
- }
- }
- }
-
- getline (buf, n, f)
- char *buf;
- register int n;
- FILE *f;
- {
- register char *p;
- int c;
-
- p = buf;
- while (--n > 0 && (c = fgetc (f)) != EOF)
- if ((*p++ = c) == '\n') break;
-
- if (ferror (f))
- {
- strcpy (buf, "error on connection");
- return NOTOK;
- }
-
- if (c == EOF && p == buf)
- {
- strcpy (buf, "connection closed by foreign host");
- return DONE;
- }
-
- *p = NULL;
- if (*--p == '\n') *p = NULL;
- if (*--p == '\r') *p = NULL;
- return OK;
- }
-
- multiline (buf, n, f)
- char *buf;
- register int n;
- FILE *f;
- {
- if (getline (buf, n, f) != OK)
- return NOTOK;
- if (*buf == '.')
- {
- if (*(buf+1) == NULL)
- return DONE;
- else
- strcpy (buf, buf+1);
- }
- return OK;
- }
-
- char *
- get_errmsg ()
- {
- extern int errno, sys_nerr;
- extern char *sys_errlist[];
- char *s;
-
- if (errno < sys_nerr)
- s = sys_errlist[errno];
- else
- s = "unknown error";
- return (s);
- }
-
- putline (buf, err, f)
- char *buf;
- char *err;
- FILE *f;
- {
- fprintf (f, "%s\r\n", buf);
- fflush (f);
- if (ferror (f))
- {
- strcpy (err, "lost connection");
- return NOTOK;
- }
- return OK;
- }
-
- mbx_write (line, mbf)
- char *line;
- FILE *mbf;
- {
- fputs (line, mbf);
- fputc (0x0a, mbf);
- }
-
- mbx_delimit_begin (mbf)
- FILE *mbf;
- {
- fputs ("\f\n0, unseen,,\n", mbf);
- }
-
- mbx_delimit_end (mbf)
- FILE *mbf;
- {
- putc ('\037', mbf);
- }
-
- #endif /* MAIL_USE_POP */
-