source: trunk/third/nmh/uip/sendsbr.c @ 12455

/*
 * sendsbr.c -- routines to help WhatNow/Send along
 *
 * $Id: sendsbr.c,v 1.1.1.1 1999-02-07 18:14:17 danw Exp $
 */

#include <h/mh.h>
#include <h/signals.h>
#include <setjmp.h>
#include <signal.h>
#include <fcntl.h>
#include <h/mime.h>

int debugsw = 0;                /* global */
int forwsw  = 1;
int inplace = 1;
int pushsw  = 0;
int splitsw = -1;
int unique  = 0;
int verbsw  = 0;

char *altmsg   = NULL;          /*  .. */
char *annotext = NULL;
char *distfile = NULL;

static int armed = 0;
static jmp_buf env;

/*
 * external prototypes
 */
int sendsbr (char **, int, char *, struct stat *, int);
void done (int);
char *getusername (void);

/*
 * static prototypes
 */
static void alert (char *, int);
static int tmp_fd (void);
static void anno (int, struct stat *);
static void annoaux (int);
static int splitmsg (char **, int, char *, struct stat *, int);
static int sendaux (char **, int, char *, struct stat *);


/*
 * Entry point into (back-end) routines to send message.
 */

int
sendsbr (char **vec, int vecp, char *drft, struct stat *st, int rename_drft)
{
    int status;
    char buffer[BUFSIZ], file[BUFSIZ];
    struct stat sts;

    armed++;
    switch (setjmp (env)) {
    case OK: 
        /*
         * If given -push and -unique (which is undocumented), then
         * rename the draft file.  I'm not quite sure why.
         */
        if (pushsw && unique) {
            if (rename (drft, strncpy (file, m_scratch (drft, invo_name), sizeof(file)))
                    == NOTOK)
                adios (file, "unable to rename %s to", drft);
            drft = file;
        }

        /*
         * Check if we need to split the message into
         * multiple messages of type "message/partial".
         */
        if (splitsw >= 0 && !distfile && stat (drft, &sts) != NOTOK
                && sts.st_size >= CPERMSG) {
            status = splitmsg (vec, vecp, drft, st, splitsw) ? NOTOK : OK;
        } else {
            status = sendaux (vec, vecp, drft, st) ? NOTOK : OK;
        }

        /* rename the original draft */
        if (rename_drft && status == OK &&
                rename (drft, strncpy (buffer, m_backup (drft), sizeof(buffer))) == NOTOK)
            advise (buffer, "unable to rename %s to", drft);
        break;

    default: 
        status = DONE;
        break;
    }

    armed = 0;
    if (distfile)
        unlink (distfile);

    return status;
}


/*
 * Split large message into several messages of
 * type "message/partial" and send them.
 */

static int
splitmsg (char **vec, int vecp, char *drft, struct stat *st, int delay)
{
    int compnum, nparts, partno, state, status;
    long pos, start;
    time_t clock;
    char *cp, *dp, buffer[BUFSIZ], msgid[BUFSIZ];
    char subject[BUFSIZ];
    char name[NAMESZ], partnum[BUFSIZ];
    FILE *in;

    if ((in = fopen (drft, "r")) == NULL)
        adios (drft, "unable to open for reading");

    cp = dp = NULL;
    start = 0L;

    /*
     * Scan through the message and examine the various header fields,
     * as well as locate the beginning of the message body.
     */
    for (compnum = 1, state = FLD;;) {
        switch (state = m_getfld (state, name, buffer, sizeof(buffer), in)) {
            case FLD:
            case FLDPLUS:
            case FLDEOF:
                compnum++;

                /*
                 * This header field is discarded.
                 */
                if (!strcasecmp (name, "Message-ID")) {
                    while (state == FLDPLUS)
                        state = m_getfld (state, name, buffer, sizeof(buffer), in);
                } else if (uprf (name, XXX_FIELD_PRF)
                        || !strcasecmp (name, VRSN_FIELD)
                        || !strcasecmp (name, "Subject")
                        || !strcasecmp (name, "Encrypted")) {
                    /*
                     * These header fields are copied to the enclosed
                     * header of the first message in the collection
                     * of message/partials.  For the "Subject" header
                     * field, we also record it, so that a modified
                     * version of it, can be copied to the header
                     * of each messsage/partial in the collection.
                     */
                    if (!strcasecmp (name, "Subject")) {
                        size_t sublen;

                        strncpy (subject, buffer, BUFSIZ);
                        sublen = strlen (subject);
                        if (sublen > 0 && subject[sublen - 1] == '\n')
                            subject[sublen - 1] = '\0';
                    }

                    dp = add (concat (name, ":", buffer, NULL), dp);
                    while (state == FLDPLUS) {
                        state = m_getfld (state, name, buffer, sizeof(buffer), in);
                        dp = add (buffer, dp);
                    }
                } else {
                    /*
                     * These header fields are copied to the header of
                     * each message/partial in the collection.
                     */
                    cp = add (concat (name, ":", buffer, NULL), cp);
                    while (state == FLDPLUS) {
                        state = m_getfld (state, name, buffer, sizeof(buffer), in);
                        cp = add (buffer, cp);
                    }
                }

                if (state != FLDEOF) {
                    start = ftell (in) + 1;
                    continue;
                }
                /* else fall... */

           case BODY:
           case BODYEOF:
           case FILEEOF:
                break;

           case LENERR:
           case FMTERR:
                adios (NULL, "message format error in component #%d", compnum);

           default:
                adios (NULL, "getfld () returned %d", state);
        }

        break;
    }
    if (cp == NULL)
        adios (NULL, "headers missing from draft");

    nparts = 1;
    pos = start;
    while (fgets (buffer, sizeof(buffer) - 1, in)) {
        long len;

        if ((pos += (len = strlen (buffer))) > CPERMSG) {
            nparts++;
            pos = len;
        }
    }

    /* Only one part, nothing to split */
    if (nparts == 1) {
        free (cp);
        if (dp)
            free (dp);

        fclose (in);
        return sendaux (vec, vecp, drft, st);
    }

    if (!pushsw) {
        printf ("Sending as %d Partial Messages\n", nparts);
        fflush (stdout);
    }
    status = OK;

    vec[vecp++] = "-partno";
    vec[vecp++] = partnum;
    if (delay == 0)
        vec[vecp++] = "-queued";

    time (&clock);
    snprintf (msgid, sizeof(msgid), "<%d.%ld@%s>",
                (int) getpid(), (long) clock, LocalName());

    fseek (in, start, SEEK_SET);
    for (partno = 1; partno <= nparts; partno++) {
        char tmpdrf[BUFSIZ];
        FILE *out;

        strncpy (tmpdrf, m_scratch (drft, invo_name), sizeof(tmpdrf));
        if ((out = fopen (tmpdrf, "w")) == NULL)
            adios (tmpdrf, "unable to open for writing");
        chmod (tmpdrf, 0600);

        /*
         * Output the header fields
         */
        fputs (cp, out);
        fprintf (out, "Subject: %s (part %d of %d)\n", subject, partno, nparts);
        fprintf (out, "%s: %s\n", VRSN_FIELD, VRSN_VALUE);
        fprintf (out, "%s: message/partial; id=\"%s\";\n", TYPE_FIELD, msgid);
        fprintf (out, "\tnumber=%d; total=%d\n", partno, nparts);
        fprintf (out, "%s: part %d of %d\n\n", DESCR_FIELD, partno, nparts);

        /*
         * If this is the first in the collection, output the
         * header fields we are encapsulating at the beginning
         * of the body of the first message.
         */
        if (partno == 1) {
            if (dp)
                fputs (dp, out);
            fprintf (out, "Message-ID: %s\n", msgid);
            fprintf (out, "\n");
        }

        pos = 0;
        for (;;) {
            long len;

            if (!fgets (buffer, sizeof(buffer) - 1, in)) {
                if (partno == nparts)
                    break;
                adios (NULL, "premature eof");
            }
            
            if ((pos += (len = strlen (buffer))) > CPERMSG) {
                fseek (in, -len, SEEK_CUR);
                break;
            }

            fputs (buffer, out);
        }

        if (fflush (out))
            adios (tmpdrf, "error writing to");

        fclose (out);

        if (!pushsw && verbsw) {
            printf ("\n");
            fflush (stdout);
        }

        /* Pause here, if a delay is specified */
        if (delay > 0 && 1 < partno && partno <= nparts) {
            if (!pushsw) {
                printf ("pausing %d seconds before sending part %d...\n",
                        delay, partno);
                fflush (stdout);
            }
            sleep ((unsigned int) delay);
        }

        snprintf (partnum, sizeof(partnum), "%d", partno);
        status = sendaux (vec, vecp, tmpdrf, st);
        unlink (tmpdrf);
        if (status != OK)
            break;

        /*
         * This is so sendaux will only annotate
         * the altmsg the first time it is called.
         */
        annotext = NULL;
    }

    free (cp);
    if (dp)
        free (dp);

    fclose (in);        /* close the draft */
    return status;
}


/*
 * Annotate original message, and
 * call `postproc' to send message.
 */

static int
sendaux (char **vec, int vecp, char *drft, struct stat *st)
{
    pid_t child_id;
    int i, status, fd, fd2;
    char backup[BUFSIZ], buf[BUFSIZ];

    fd = pushsw ? tmp_fd () : NOTOK;
    fd2 = NOTOK;

    vec[vecp++] = drft;
    if (annotext) {
        if ((fd2 = tmp_fd ()) != NOTOK) {
            vec[vecp++] = "-idanno";
            snprintf (buf, sizeof(buf), "%d", fd2);
            vec[vecp++] = buf;
        } else {
            admonish (NULL, "unable to create file for annotation list");
        }
    }
    if (distfile && distout (drft, distfile, backup) == NOTOK)
        done (1);
    vec[vecp] = NULL;

    for (i = 0; (child_id = vfork()) == NOTOK && i < 5; i++)
        sleep (5);

    switch (child_id) {
    case -1:
        /* oops -- fork error */
        adios ("fork", "unable to");
        break;  /* NOT REACHED */

    case 0:
        /*
         * child process -- send it
         *
         * If fd is ok, then we are pushing and fd points to temp
         * file, so capture anything on stdout and stderr there.
         */
        if (fd != NOTOK) {
            dup2 (fd, fileno (stdout));
            dup2 (fd, fileno (stderr));
            close (fd);
        }
        execvp (postproc, vec);
        fprintf (stderr, "unable to exec ");
        perror (postproc);
        _exit (-1);
        break;  /* NOT REACHED */

    default:
        /*
         * parent process -- wait for it
         */
        if ((status = pidwait(child_id, NOTOK)) == OK) {
            if (annotext && fd2 != NOTOK)
                anno (fd2, st);
        } else {
            /*
             * If postproc failed, and we have good fd (which means
             * we pushed), then mail error message (and possibly the
             * draft) back to the user.
             */
            if (fd != NOTOK) {
                alert (drft, fd);
                close (fd);
            } else {
                advise (NULL, "message not delivered to anyone");
            }
            if (annotext && fd2 != NOTOK)
                close (fd2);
            if (distfile) {
                unlink (drft);
                if (rename (backup, drft) == NOTOK)
                    advise (drft, "unable to rename %s to", backup);
            }
        }
        break;
    }

    return status;
}


/*
 * Mail error notification (and possibly a copy of the
 * message) back to the user, using the mailproc
 */

static void
alert (char *file, int out)
{
    pid_t child_id;
    int i, in;
    char buf[BUFSIZ];

    for (i = 0; (child_id = fork()) == NOTOK && i < 5; i++)
        sleep (5);

    switch (child_id) {
        case NOTOK:
            /* oops -- fork error */
            advise ("fork", "unable to");

        case OK:
            /* child process -- send it */
            SIGNAL (SIGHUP, SIG_IGN);
            SIGNAL (SIGINT, SIG_IGN);
            SIGNAL (SIGQUIT, SIG_IGN);
            SIGNAL (SIGTERM, SIG_IGN);
            if (forwsw) {
                if ((in = open (file, O_RDONLY)) == NOTOK) {
                    admonish (file, "unable to re-open");
                } else {
                    lseek (out, (off_t) 0, SEEK_END);
                    strncpy (buf, "\nMessage not delivered to anyone.\n", sizeof(buf));
                    write (out, buf, strlen (buf));
                    strncpy (buf, "\n------- Unsent Draft\n\n", sizeof(buf));
                    write (out, buf, strlen (buf));
                    cpydgst (in, out, file, "temporary file");
                    close (in);
                    strncpy (buf, "\n------- End of Unsent Draft\n", sizeof(buf));
                    write (out, buf, strlen (buf));
                    if (rename (file, strncpy (buf, m_backup (file), sizeof(buf))) == NOTOK)
                        admonish (buf, "unable to rename %s to", file);
                }
            }
            lseek (out, (off_t) 0, SEEK_SET);
            dup2 (out, fileno (stdin));
            close (out);
            /* create subject for error notification */
            snprintf (buf, sizeof(buf), "send failed on %s",
                        forwsw ? "enclosed draft" : file);

            execlp (mailproc, r1bindex (mailproc, '/'), getusername (),
                    "-subject", buf, NULL);
            fprintf (stderr, "unable to exec ");
            perror (mailproc);
            _exit (-1);

        default:                /* no waiting... */
            break;
    }
}


static int
tmp_fd (void)
{
    int fd;
    char tmpfil[BUFSIZ];

    strncpy (tmpfil, m_tmpfil (invo_name), sizeof(tmpfil));
    if ((fd = open (tmpfil, O_RDWR | O_CREAT | O_TRUNC, 0600)) == NOTOK)
        return NOTOK;
    if (debugsw)
        advise (NULL, "temporary file %s selected", tmpfil);
    else
        if (unlink (tmpfil) == NOTOK)
            advise (tmpfil, "unable to remove");

    return fd;
}


static void
anno (int fd, struct stat *st)
{
    pid_t child_id;
    sigset_t set, oset;
    static char *cwd = NULL;
    struct stat st2;

    if (altmsg &&
            (stat (altmsg, &st2) == NOTOK
                || st->st_mtime != st2.st_mtime
                || st->st_dev != st2.st_dev
                || st->st_ino != st2.st_ino)) {
        if (debugsw)
            admonish (NULL, "$mhaltmsg mismatch");
        return;
    }

    child_id = debugsw ? NOTOK : fork ();
    switch (child_id) {
        case NOTOK:             /* oops */
            if (!debugsw)
                advise (NULL,
                            "unable to fork, so doing annotations by hand...");
            if (cwd == NULL)
                cwd = getcpy (pwd ());

        case OK: 
            /* block a few signals */
            sigemptyset (&set);
            sigaddset (&set, SIGHUP);
            sigaddset (&set, SIGINT);
            sigaddset (&set, SIGQUIT);
            sigaddset (&set, SIGTERM);
            SIGPROCMASK (SIG_BLOCK, &set, &oset);

            annoaux (fd);
            if (child_id == OK)
                _exit (0);

            /* reset the signal mask */
            SIGPROCMASK (SIG_SETMASK, &oset, &set);

            chdir (cwd);
            break;

        default:                /* no waiting... */
            close (fd);
            break;
    }
}


static void
annoaux (int fd)
{
    int fd2, fd3, msgnum;
    char *cp, *folder, *maildir;
    char buffer[BUFSIZ], **ap;
    FILE *fp;
    struct msgs *mp;

    if ((folder = getenv ("mhfolder")) == NULL || *folder == 0) {
        if (debugsw)
            admonish (NULL, "$mhfolder not set");
        return;
    }
    maildir = m_maildir (folder);
    if (chdir (maildir) == NOTOK) {
        if (debugsw)
            admonish (maildir, "unable to change directory to");
        return;
    }
    if (!(mp = folder_read (folder))) {
        if (debugsw)
            admonish (NULL, "unable to read folder %s");
        return;
    }

    /* check for empty folder */
    if (mp->nummsg == 0) {
        if (debugsw)
            admonish (NULL, "no messages in %s", folder);
        goto oops;
    }

    if ((cp = getenv ("mhmessages")) == NULL || *cp == 0) {
        if (debugsw)
            admonish (NULL, "$mhmessages not set");
        goto oops;
    }
    if (!debugsw                        /* MOBY HACK... */
            && pushsw
            && (fd3 = open ("/dev/null", O_RDWR)) != NOTOK
            && (fd2 = dup (fileno (stderr))) != NOTOK) {
        dup2 (fd3, fileno (stderr));
        close (fd3);
    }
    else
        fd2 = NOTOK;
    for (ap = brkstring (cp = getcpy (cp), " ", NULL); *ap; ap++)
        m_convert (mp, *ap);
    free (cp);
    if (fd2 != NOTOK)
        dup2 (fd2, fileno (stderr));
    if (mp->numsel == 0) {
        if (debugsw)
            admonish (NULL, "no messages to annotate");
        goto oops;
    }

    lseek (fd, (off_t) 0, SEEK_SET);
    if ((fp = fdopen (fd, "r")) == NULL) {
        if (debugsw)
            admonish (NULL, "unable to fdopen annotation list");
        goto oops;
    }
    cp = NULL;
    while (fgets (buffer, sizeof(buffer), fp) != NULL)
        cp = add (buffer, cp);
    fclose (fp);

    if (debugsw)
        advise (NULL, "annotate%s with %s: \"%s\"",
                inplace ? " inplace" : "", annotext, cp);
    for (msgnum = mp->lowsel; msgnum <= mp->hghsel; msgnum++) {
        if (is_selected(mp, msgnum)) {
            if (debugsw)
                advise (NULL, "annotate message %d", msgnum);
            annotate (m_name (msgnum), annotext, cp, inplace, 1);
        }
    }

    free (cp);

oops:
    folder_free (mp);   /* free folder/message structure */
}


void
done (int status)
{
    if (armed)
        longjmp (env, status ? status : NOTOK);

    exit (status);
}