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NetBSD/usr.bin/mail/send.c
christos 85c81c58a5 Jumbo mail patch from our anonymous user: 
1) Use editline [optional]:
   Most of this code was borrowed from src/usr.bin/ftp.  It does the
   appropriate editing, history, and completion for all mail commands
   (from cmdtab[]) and also does editing on header strings ('~h' inside
   the mail editor).

2) '-B' flag:
   This will suppress the "To:" line passed to sendmail.  In most
   configurations it will lead to sendmail adding "To: undisclosed
   recipients;".  Currently, AFAIK mail requires at least one exposed
   recipient address.

3) Comments in rcfile:
   Currently, comments in .mailrc are only supported if the first
   (non-white) character on a line is '#' followed by white space,
   i.e., '#' is a 'nop' command.  This (trivial) patch allows the more
   normal/expected use of '#' as a comment character.  It does not
   respect quoting, so that might be an objection which I should fix.

4) Sendmail option editing:
   This adds the sendmail option string to the strings editable by the
   '~h' command within the mail editor.  Currently, you can only set
   this string from the command-line, which is particularly annoying
   when replying to mail.

5) Reply from:
   When replying to a message, grab the "To:" address from the message
   and, if there is only one such address and it does not match a list of
   allowed addresses (set in the "ReplyFrom" variable), pass it to
   sendmail as the "From:" address for the reply (with the '-f' option).
   I often make aliases for myself so that my primary address is not
   given out; if the alias gets out, I know who to blame.  Unfortunately,
   a reply to such a message would normally use the primary address
   without this patch.  A warning is displayed when this is going to
   happen so that it can be modified with '~h'.

6) CC and BCC lists:
   Allow '-c' and '-b' to accept white-space or ',' delimited lists.
   Currently, a white-space delimited list of addresses work, but a
   list of aliases will not get expanded.  For example, currently:

	mail -c "foo bar" christos

   will fail to send mail to 'foo' and 'bar' if these are mail aliases
   (in ~/.mailrc); sendmail aliases (in /etc/aliases) do work.

7) pipe command:
   This pipes the current message into a shell command.  I use this for
   quick decoding of uuencoded mail, but I can imagine it might be
   useful for decrypting encrypted mail, too.

8) show command:
   This command takes a list of variables and shows their values.  It
   is probably stupid as the 'set' command without any argument
   displays all variable values.  Of course, if there are a lot of
   variables you have to sift through the list for the one(s) you want.
2006-09-18 19:46:21 +00:00

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/* $NetBSD: send.c,v 1.25 2006/09/18 19:46:21 christos 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
#if 0
static char sccsid[] = "@(#)send.c 8.1 (Berkeley) 6/6/93";
#else
__RCSID("$NetBSD: send.c,v 1.25 2006/09/18 19:46:21 christos Exp $");
#endif
#endif /* not lint */
#include "rcv.h"
#include "extern.h"
/*
* Mail -- a mail program
*
* Mail to others.
*/
/*
* Send message described by the passed pointer to the
* passed output buffer. Return -1 on error.
* Adjust the status: field if need be.
* If doign is given, suppress ignored header fields.
* prefix is a string to prepend to each output line.
*/
int
sendmessage(struct message *mp, FILE *obuf, struct ignoretab *doign,
const char *prefix)
{
off_t len;
FILE *ibuf;
char line[LINESIZE];
int isheadflag, infld, ignoring = 0, dostat, firstline;
char *cp, *cp2;
int c = 0;
size_t length;
size_t prefixlen = 0;
/*
* Compute the prefix string, without trailing whitespace
*/
if (prefix != NULL) {
const char *dp, *dp2 = NULL;
for (dp = prefix; *dp; dp++)
if (*dp != ' ' && *dp != '\t')
dp2 = dp;
prefixlen = dp2 == 0 ? 0 : dp2 - prefix + 1;
}
ibuf = setinput(mp);
len = mp->m_size;
isheadflag = 1;
dostat = doign == 0 || !isign("status", doign);
infld = 0;
firstline = 1;
/*
* Process headers first
*/
while (len > 0 && isheadflag) {
if (fgets(line, LINESIZE, ibuf) == NULL)
break;
len -= length = strlen(line);
if (firstline) {
/*
* First line is the From line, so no headers
* there to worry about
*/
firstline = 0;
ignoring = doign == ignoreall;
} else if (line[0] == '\n') {
/*
* If line is blank, we've reached end of
* headers, so force out status: field
* and note that we are no longer in header
* fields
*/
if (dostat) {
statusput(mp, obuf, prefix);
dostat = 0;
}
isheadflag = 0;
ignoring = doign == ignoreall;
} else if (infld && (line[0] == ' ' || line[0] == '\t')) {
/*
* If this line is a continuation (via space or tab)
* of a previous header field, just echo it
* (unless the field should be ignored).
* In other words, nothing to do.
*/
} else {
/*
* Pick up the header field if we have one.
*/
for (cp = line; (c = *cp++) && c != ':' && !isspace(c);)
;
cp2 = --cp;
while (isspace((unsigned char)*cp++))
;
if (cp[-1] != ':') {
/*
* Not a header line, force out status:
* This happens in uucp style mail where
* there are no headers at all.
*/
if (dostat) {
statusput(mp, obuf, prefix);
dostat = 0;
}
if (doign != ignoreall)
/* add blank line */
(void)putc('\n', obuf);
isheadflag = 0;
ignoring = 0;
} else {
/*
* If it is an ignored field and
* we care about such things, skip it.
*/
*cp2 = 0; /* temporarily null terminate */
if (doign && isign(line, doign))
ignoring = 1;
else if ((line[0] == 's' || line[0] == 'S') &&
strcasecmp(line, "status") == 0) {
/*
* If the field is "status," go compute
* and print the real Status: field
*/
if (dostat) {
statusput(mp, obuf, prefix);
dostat = 0;
}
ignoring = 1;
} else {
ignoring = 0;
*cp2 = c; /* restore */
}
infld = 1;
}
}
if (!ignoring) {
/*
* Strip trailing whitespace from prefix
* if line is blank.
*/
if (prefix != NULL) {
if (length > 1)
(void)fputs(prefix, obuf);
else
(void)fwrite(prefix, sizeof *prefix,
prefixlen, obuf);
}
(void)fwrite(line, sizeof *line, length, obuf);
if (ferror(obuf))
return -1;
}
}
/*
* Copy out message body
*/
if (doign == ignoreall)
len--; /* skip final blank line */
if (prefix != NULL)
while (len > 0) {
if (fgets(line, LINESIZE, ibuf) == NULL) {
c = 0;
break;
}
len -= c = strlen(line);
/*
* Strip trailing whitespace from prefix
* if line is blank.
*/
if (c > 1)
(void)fputs(prefix, obuf);
else
(void)fwrite(prefix, sizeof *prefix,
prefixlen, obuf);
(void)fwrite(line, sizeof *line, (size_t)c, obuf);
if (ferror(obuf))
return -1;
}
else
while (len > 0) {
c = (int)(len < LINESIZE ? len : LINESIZE);
if ((c = fread(line, sizeof *line, (size_t)c, ibuf)) <= 0)
break;
len -= c;
if (fwrite(line, sizeof *line, (size_t)c, obuf) != c)
return -1;
}
if (doign == ignoreall && c > 0 && line[c - 1] != '\n')
/* no final blank line */
if ((c = getc(ibuf)) != EOF && putc(c, obuf) == EOF)
return -1;
return 0;
}
/*
* Output a reasonable looking status field.
*/
void
statusput(struct message *mp, FILE *obuf, const char *prefix)
{
char statout[3];
char *cp = statout;
if (mp->m_flag & MREAD)
*cp++ = 'R';
if ((mp->m_flag & MNEW) == 0)
*cp++ = 'O';
*cp = 0;
if (statout[0])
(void)fprintf(obuf, "%sStatus: %s\n",
prefix == NULL ? "" : prefix, statout);
}
/*
* Interface between the argument list and the mail1 routine
* which does all the dirty work.
*/
int
mail(struct name *to, struct name *cc, struct name *bcc,
struct name *smopts, char *subject)
{
struct header head;
head.h_to = to;
head.h_subject = subject;
head.h_cc = cc;
head.h_bcc = bcc;
head.h_smopts = smopts;
mail1(&head, 0);
return(0);
}
/*
* Send mail to a bunch of user names. The interface is through
* the mail routine below.
*/
int
sendmail(void *v)
{
char *str = v;
struct header head;
head.h_to = extract(str, GTO);
head.h_subject = NULL;
head.h_cc = NULL;
head.h_bcc = NULL;
head.h_smopts = NULL;
mail1(&head, 0);
return(0);
}
/*
* Mail a message on standard input to the people indicated
* in the passed header. (Internal interface).
*/
void
mail1(struct header *hp, int printheaders)
{
const char *cp;
int pid;
const char **namelist;
struct name *to;
FILE *mtf;
/*
* Collect user's mail from standard input.
* Get the result as mtf.
*/
if ((mtf = collect(hp, printheaders)) == NULL)
return;
if (value("interactive") != NULL) {
if (value("askcc") != NULL || value("askbcc") != NULL) {
if (value("askcc") != NULL)
(void)grabh(hp, GCC);
if (value("askbcc") != NULL)
(void)grabh(hp, GBCC);
} else {
(void)printf("EOT\n");
(void)fflush(stdout);
}
}
if (fsize(mtf) == 0) {
if (value("dontsendempty") != NULL)
goto out;
if (hp->h_subject == NULL)
(void)printf("No message, no subject; hope that's ok\n");
else
(void)printf("Null message body; hope that's ok\n");
}
/*
* Now, take the user names from the combined
* to and cc lists and do all the alias
* processing.
*/
senderr = 0;
to = usermap(cat(hp->h_bcc, cat(hp->h_to, hp->h_cc)));
if (to == NULL) {
(void)printf("No recipients specified\n");
senderr++;
}
/*
* Look through the recipient list for names with /'s
* in them which we write to as files directly.
*/
to = outof(to, mtf, hp);
if (senderr)
savedeadletter(mtf);
to = elide(to);
if (count(to) == 0)
goto out;
fixhead(hp, to);
if ((mtf = infix(hp, mtf)) == NULL) {
(void)fprintf(stderr, ". . . message lost, sorry.\n");
return;
}
namelist = unpack(cat(hp->h_smopts, to));
if (debug) {
const char **t;
(void)printf("Sendmail arguments:");
for (t = namelist; *t != NULL; t++)
(void)printf(" \"%s\"", *t);
(void)printf("\n");
goto out;
}
if ((cp = value("record")) != NULL)
(void)savemail(expand(cp), mtf, hp->h_to);
/*
* Fork, set up the temporary mail file as standard
* input for "mail", and exec with the user list we generated
* far above.
*/
pid = fork();
if (pid == -1) {
warn("fork");
savedeadletter(mtf);
goto out;
}
if (pid == 0) {
sigset_t nset;
(void)sigemptyset(&nset);
(void)sigaddset(&nset, SIGHUP);
(void)sigaddset(&nset, SIGINT);
(void)sigaddset(&nset, SIGQUIT);
(void)sigaddset(&nset, SIGTSTP);
(void)sigaddset(&nset, SIGTTIN);
(void)sigaddset(&nset, SIGTTOU);
prepare_child(&nset, fileno(mtf), -1);
if ((cp = value("sendmail")) != NULL)
cp = expand(cp);
else
cp = _PATH_SENDMAIL;
(void)execv(cp, (char *const *)__UNCONST(namelist));
warn("%s", cp);
_exit(1);
}
if (value("verbose") != NULL)
(void)wait_child(pid);
else
free_child(pid);
out:
(void)Fclose(mtf);
}
/*
* Fix the header by glopping all of the expanded names from
* the distribution list into the appropriate fields.
*/
void
fixhead(struct header *hp, struct name *tolist)
{
struct name *np;
hp->h_to = NULL;
hp->h_cc = NULL;
hp->h_bcc = NULL;
for (np = tolist; np != NULL; np = np->n_flink) {
if (np->n_type & GDEL)
continue; /* Don't copy deleted addresses to the header */
if ((np->n_type & GMASK) == GTO)
hp->h_to =
cat(hp->h_to, nalloc(np->n_name, np->n_type));
else if ((np->n_type & GMASK) == GCC)
hp->h_cc =
cat(hp->h_cc, nalloc(np->n_name, np->n_type));
else if ((np->n_type & GMASK) == GBCC)
hp->h_bcc =
cat(hp->h_bcc, nalloc(np->n_name, np->n_type));
}
}
/*
* Prepend a header in front of the collected stuff
* and return the new file.
*/
FILE *
infix(struct header *hp, FILE *fi)
{
FILE *nfo, *nfi;
int c, fd;
char tempname[PATHSIZE];
(void)snprintf(tempname, sizeof(tempname),
"%s/mail.RsXXXXXXXXXX", tmpdir);
if ((fd = mkstemp(tempname)) == -1 ||
(nfo = Fdopen(fd, "w")) == NULL) {
if (fd != -1)
(void)close(fd);
warn("%s", tempname);
return(fi);
}
if ((nfi = Fopen(tempname, "r")) == NULL) {
warn("%s", tempname);
(void)Fclose(nfo);
(void)rm(tempname);
return(fi);
}
(void)rm(tempname);
(void)puthead(hp, nfo, GTO|GSUBJECT|GCC|GBCC|GNL|GCOMMA);
c = getc(fi);
while (c != EOF) {
(void)putc(c, nfo);
c = getc(fi);
}
if (ferror(fi)) {
warn("read");
rewind(fi);
return(fi);
}
(void)fflush(nfo);
if (ferror(nfo)) {
warn("%s", tempname);
(void)Fclose(nfo);
(void)Fclose(nfi);
rewind(fi);
return(fi);
}
(void)Fclose(nfo);
(void)Fclose(fi);
rewind(nfi);
return(nfi);
}
/*
* Dump the to, subject, cc header on the
* passed file buffer.
*/
int
puthead(struct header *hp, FILE *fo, int w)
{
int gotcha;
gotcha = 0;
if (hp->h_to != NULL && w & GTO)
if (!Bflag)
fmt("To:", hp->h_to, fo, w&GCOMMA), gotcha++;
if (hp->h_subject != NULL && w & GSUBJECT)
(void)fprintf(fo, "Subject: %s\n", hp->h_subject), gotcha++;
if (hp->h_smopts != NULL && w & GSMOPTS)
(void)fprintf(fo, "(sendmail options: %s)\n", detract(hp->h_smopts, GSMOPTS)), gotcha++;
if (hp->h_cc != NULL && w & GCC)
fmt("Cc:", hp->h_cc, fo, w&GCOMMA), gotcha++;
if (hp->h_bcc != NULL && w & GBCC)
fmt("Bcc:", hp->h_bcc, fo, w&GCOMMA), gotcha++;
if (gotcha && w & GNL)
(void)putc('\n', fo);
return(0);
}
/*
* Format the given header line to not exceed 72 characters.
*/
void
fmt(const char *str, struct name *np, FILE *fo, int comma)
{
int col, len;
comma = comma ? 1 : 0;
col = strlen(str);
if (col)
(void)fputs(str, fo);
for (; np != NULL; np = np->n_flink) {
if (np->n_flink == NULL)
comma = 0;
len = strlen(np->n_name);
col++; /* for the space */
if (col + len + comma > 72 && col > 4) {
(void)fputs("\n ", fo);
col = 4;
} else
(void)putc(' ', fo);
(void)fputs(np->n_name, fo);
if (comma)
(void)putc(',', fo);
col += len + comma;
}
(void)putc('\n', fo);
}
/*
* Save the outgoing mail on the passed file.
*/
/*ARGSUSED*/
int
savemail(const char name[], FILE *fi, struct name *to)
{
FILE *fo;
char buf[BUFSIZ];
int i;
time_t now;
mode_t m;
m = umask(077);
fo = Fopen(name, "a");
(void)umask(m);
if (fo == NULL) {
warn("%s", name);
return (-1);
}
(void)time(&now);
(void)fprintf(fo, "From %s %s", myname, ctime(&now));
if (Bflag) { /* Make sure we save a "To:" line if -B is set */
struct name *n;
(void)fputs("To: undisclosed-recipients:", fo);
for (n = to; n != NULL; n = n->n_flink)
if ((n->n_type & GDEL) == 0)
(void)fprintf(fo, " %s", n->n_name);
(void)putc('\n', fo);
}
while ((i = fread(buf, 1, sizeof buf, fi)) > 0)
(void)fwrite(buf, 1, (size_t)i, fo);
(void)putc('\n', fo);
(void)fflush(fo);
if (ferror(fo))
warn("%s", name);
(void)Fclose(fo);
rewind(fi);
return (0);
}
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