Initial revision

1 files changed, 642 insertions, 0 deletions

diff --git a/lib-src/movemail.c b/lib-src/movemail.c
new file mode 100644
index 00000000000..32e4039d519
--- /dev/null
+++ b/lib-src/movemail.c
@@ -0,0 +1,642 @@
+/* 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 distributed in the hope that it will be useful,
+but without any warranty.  No author or distributor
+accepts responsibility to anyone for the consequences of using it
+or for whether it serves any particular purpose or works at all,
+unless he says so in writing.
+
+Everyone is granted permission to copy, modify and redistribute
+GNU Emacs, but only under the conditions described in the
+document "GNU Emacs copying permission notice".   An exact copy
+of the document is supposed to have been given to you along with
+GNU Emacs so that you can know how you may redistribute it all.
+It should be in a file named COPYING.  Among other things, the
+copyright notice and this notice must be preserved on all copies.  */
+
+/*
+ * 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>
+#endif /* USG */
+
+#ifdef XENIX
+#include <sys/locking.h>
+#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[40];
+  int desc;
+#endif /* not MAIL_USE_FLOCK */
+
+  delete_lockname = 0;
+
+  if (argc < 3)
+    fatal ("two arguments required");
+
+  inname = argv[1];
+  outname = argv[2];
+
+  /* Check access to input and output file.  */
+  if (access (inname, R_OK | W_OK) != 0)
+    pfatal_with_name (inname);
+  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 */
+
+#ifndef MAIL_USE_FLOCK
+  /* Use a lock file named /usr/spool/mail/$USER.lock:
+     If it exists, the mail file is locked.  */
+  lockname = concat (inname, ".lock", "");
+  strcpy (tempname, inname);
+  p = tempname + strlen (tempname);
+  while (p != tempname && p[-1] != '/')
+    p--;
+  *p = 0;
+  strcpy (p, "EXXXXXX");
+  mktemp (tempname);
+  (void) 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 (concat ("temporary file \"", tempname, "\""));
+      close (desc);
+
+      tem = link (tempname, lockname);
+      (void) 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)
+	    (void) 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 */
+  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;
+	  (void) unlink (outname);
+	  errno = saved_errno;
+	  pfatal_with_name (outname);
+	}
+      if (nread < sizeof buf)
+	break;
+    }
+
+#ifdef BSD
+  fsync (outdesc);
+#endif
+
+  /* Check to make sure no errors before we zap the inbox.  */
+  if (close (outdesc) != 0)
+    {
+      int saved_errno = errno;
+      (void) unlink (outname);
+      errno = saved_errno;
+      pfatal_with_name (outname);
+  }
+
+#ifdef MAIL_USE_FLOCK
+#if defined(STRIDE) || defined(XENIX)
+  /* Stride, xenix have file locking, but no ftruncate.  This mess will do. */
+  (void) close (open (inname, O_CREAT | O_TRUNC | O_RDWR, 0666));
+#else
+  (void) ftruncate (indesc, 0L);
+#endif /* STRIDE or XENIX */
+#endif /* MAIL_USE_FLOCK */
+  close (indesc);
+
+#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);
+  (void) unlink (lockname);
+#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)
+     char *s1, *s2;
+{
+  printf ("movemail: ");
+  printf (s1, s2);
+  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);
+}
+
+/* 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>
+
+#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;
+
+popmail(user, outfile)
+char *user;
+char *outfile;
+{
+    char *host;
+    int nmsgs, nbytes;
+    char response[128];
+    register int i;
+    int mbfi;
+    FILE *mbf;
+    char *getenv();
+    int mbx_write();
+    char *get_errmsg();
+
+    host = getenv("MAILHOST");
+    if (host == NULL) {
+	fatal("no MAILHOST defined");
+    }
+
+    if (pop_init(host) == NOTOK) {
+	error(Errmsg);
+	return(1);
+    }
+
+    if (getline(response, sizeof response, sfi) != OK) {
+	error(response);
+	return(1);
+    }
+
+    if (pop_command("USER %s", user) == NOTOK || 
+	pop_command("RPOP %s", user) == NOTOK) {
+	error(Errmsg);
+	pop_command("QUIT");
+	return(1);
+    }
+
+    if (pop_stat(&nmsgs, &nbytes) == NOTOK) {
+	error(Errmsg);
+	pop_command("QUIT");
+	return(1);
+    }
+
+    if (!nmsgs)
+      {
+	pop_command("QUIT");
+	return(0);
+      }
+
+    mbfi = open (outfile, O_WRONLY | O_CREAT | O_EXCL, 0666);
+    if (mbfi < 0)
+      {
+	pop_command("QUIT");
+	error("Error in open: %s, %s", get_errmsg(), outfile);
+	return(1);
+      }
+    fchown(mbfi, getuid(), -1);
+
+    if ((mbf = fdopen(mbfi, "w")) == NULL)
+      {
+	pop_command("QUIT");
+	error("Error in fdopen: %s", get_errmsg());
+	close(mbfi);
+	unlink(outfile);
+	return(1);
+      }
+
+    for (i = 1; i <= nmsgs; i++) {
+	mbx_delimit_begin(mbf);
+	if (pop_retr(i, mbx_write, mbf) != OK) {
+	    error(Errmsg);
+	    pop_command("QUIT");
+	    close(mbfi);
+	    return(1);
+	}
+	mbx_delimit_end(mbf);
+	fflush(mbf);
+    }
+
+    for (i = 1; i <= nmsgs; i++) {
+	if (pop_command("DELE %d", i) == NOTOK) {
+	    error(Errmsg);
+	    pop_command("QUIT");
+	    close(mbfi);
+	    return(1);
+	}
+    }
+
+    pop_command("QUIT");
+    close(mbfi);
+    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;
+    char *get_errmsg();
+
+    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 */