Started revising m_getfld() code to replace direct buffer

[nmh] / uip / sendsbr.c

/*
 * sendsbr.c -- routines to help WhatNow/Send along
 *
 * This code is Copyright (c) 2002, by the authors of nmh.  See the
 * COPYRIGHT file in the root directory of the nmh distribution for
 * complete copyright information.
 */

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

#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#endif
#include <time.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 jmp_buf env;

static  char    body_file_name[PATH_MAX + 1];           /* name of temporary file for body content */
static  char    composition_file_name[PATH_MAX + 1];    /* name of mhbuild composition temporary file */
static  int     field_size;                             /* size of header field buffer */
static  char    *field;                                 /* header field buffer */
static  FILE    *draft_file;                            /* draft file pointer */
static  FILE    *body_file;                             /* body file pointer */
static  FILE    *composition_file;                      /* composition file pointer */

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

/*
 * static prototypes
 */
static void armed_done (int) NORETURN;
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 *);

static  int     attach(char *, char *, int);
static  void    clean_up_temporary_files(void);
static  int     get_line(void);
static  void    make_mime_composition_file_entry(char *, int, char *);


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

int
sendsbr (char **vec, int vecp, char *drft, struct stat *st, int rename_drft, char *attachment_header_field_name, int attachformat)
{
    int status;
    char buffer[BUFSIZ], file[BUFSIZ];
    struct stat sts;
    char        *original_draft;                /* name of original draft file */
    char        *p;                             /* string pointer for building file name */

    /*
     *  Save the original name of the draft file.  The name of the draft file is changed
     *  to a temporary file containing the built MIME message if there are attachments.
     *  We need the original name so that it can be renamed after the message is sent.
     */

    original_draft = drft;

    /*
     *  There might be attachments if a header field name for attachments is supplied.
     *  Convert the draft to a MIME message.  Use the mhbuild composition file for the
     *  draft if there was a successful conversion because that now contains the MIME
     *  message.  A nice side effect of this is that it leaves the original draft file
     *  untouched so that it can be retrieved and modified if desired.
     */

    if (attachment_header_field_name != (char *)0) {
        switch (attach(attachment_header_field_name, drft, attachformat)) {
        case OK:
            drft = composition_file_name;
            break;

        case NOTOK:
            return (NOTOK);

        case DONE:
            break;
        }
    }

    done=armed_done;
    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) {
            char *cp = m_mktemp2(drft, invo_name, NULL, NULL);
            if (cp == NULL) {
                adios ("sendsbr", "unable to create temporary file");
            }
            if (rename (drft, strncpy(file, cp, 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 (original_draft, strncpy (buffer, m_backup (original_draft), sizeof(buffer))) == NOTOK)
            advise (buffer, "unable to rename %s to", drft);
        break;

    default: 
        status = DONE;
        break;
    }

    done=exit;
    if (distfile)
        unlink (distfile);

    /*
     *  Get rid of any temporary files that we created for attachments.  Also get rid of
     *  the renamed composition file that mhbuild leaves as a turd.  It looks confusing,
     *  but we use the body file name to help build the renamed composition file name.
     */

    if (drft == composition_file_name) {
        clean_up_temporary_files();

        if (strlen(composition_file_name) >= sizeof (composition_file_name) - 6)
            advise((char *)0, "unable to remove original composition file.");

        else {
            if ((p = strrchr(composition_file_name, '/')) == (char *)0)
                p = composition_file_name;
            else
                p++;
            
            (void)strcpy(body_file_name, p);
            *p++ = ',';
            (void)strcpy(p, body_file_name);
            (void)strcat(p, ".orig");
            
            (void)unlink(composition_file_name);
        }
    }

    return status;
}

static  int
attach(char *attachment_header_field_name, char *draft_file_name,
       int attachformat)
{
    char                buf[PATH_MAX + 6];      /* miscellaneous buffer */
    int                 c;                      /* current character for body copy */
    int                 has_attachment;         /* draft has at least one attachment */
    int                 has_body;               /* draft has a message body */
    int                 length;                 /* length of attachment header field name */
    char                *p;                     /* miscellaneous string pointer */
    FILE                *fp;                    /* pointer for mhn.defaults */

    /*
     *  Open up the draft file.
     */

    if ((draft_file = fopen(draft_file_name, "r")) == (FILE *)0)
        adios((char *)0, "can't open draft file `%s'.", draft_file_name);

    /*
     *  Allocate a buffer to hold the header components as they're read in.
     *  This buffer might need to be quite large, so we grow it as needed.
     */

    field = (char *)mh_xmalloc(field_size = 256);

    /*
     *  Scan the draft file for a header field name, with a non-empty
     *  body, that matches the -attach argument.  The existence of one
     *  indicates that the draft has attachments.  Bail out if there
     *  are no attachments because we're done.  Read to the end of the
     *  headers even if we have no attachments.
     */

    length = strlen(attachment_header_field_name);

    has_attachment = 0;

    while (get_line() != EOF && *field != '\0' && *field != '-') {
        if (strncasecmp(field, attachment_header_field_name, length) == 0 &&
            field[length] == ':') {
            for (p = field + length + 1; *p == ' ' || *p == '\t'; p++)
                ;
            if (strlen (p) > 0) {
                has_attachment = 1;
            }
        }
    }

    if (has_attachment == 0)
        return (DONE);

    /*
     *  We have at least one attachment.  Look for at least one non-blank line
     *  in the body of the message which indicates content in the body.
     */

    has_body = 0;

    while (get_line() != EOF) {
        for (p = field; *p != '\0'; p++) {
            if (*p != ' ' && *p != '\t') {
                has_body = 1;
                break;
            }
        }

        if (has_body)
            break;
    }

    /*
     *  Make names for the temporary files.
     */

    (void)strncpy(body_file_name,
                  m_mktemp(m_maildir(invo_name), NULL, NULL),
                  sizeof (body_file_name));
    (void)strncpy(composition_file_name,
                  m_mktemp(m_maildir(invo_name), NULL, NULL),
                  sizeof (composition_file_name));

    if (has_body)
        body_file = fopen(body_file_name, "w");

    composition_file = fopen(composition_file_name, "w");

    if ((has_body && body_file == (FILE *)0) || composition_file == (FILE *)0) {
        clean_up_temporary_files();
        adios((char *)0, "unable to open all of the temporary files.");
    }

    /*
     *  Start at the beginning of the draft file.  Copy all
     *  non-attachment header fields to the temporary composition
     *  file.  Then add the dashed line separator.
     */

    rewind(draft_file);

    while (get_line() != EOF && *field != '\0' && *field != '-')
        if (strncasecmp(field, attachment_header_field_name, length) != 0 ||
            field[length] != ':')
            (void)fprintf(composition_file, "%s\n", field);

    (void)fputs("--------\n", composition_file);

    /*
     *  Copy the message body to a temporary file.
     */

    if (has_body) {
        while ((c = getc(draft_file)) != EOF)
                putc(c, body_file);

        (void)fclose(body_file);
    }

    /*
     *  Add a mhbuild MIME composition file line for the body if there was one.
     *  Set the default content type to text/plain so that mhbuild takes care
     *  of any necessary encoding.
     */

    if (has_body)
        make_mime_composition_file_entry(body_file_name, attachformat,
                                         "text/plain");

    /*
     *  Now, go back to the beginning of the draft file and look for
     *  header fields that specify attachments.  Add a mhbuild MIME
     *  composition file for each.
     */

    if ((fp = fopen (p = etcpath ("mhn.defaults"), "r"))) {
        readconfig ((struct node **) NULL, fp, p, 0);
        fclose(fp);
    }

    rewind(draft_file);

    while (get_line() != EOF && *field != '\0' && *field != '-') {
        if (strncasecmp(field, attachment_header_field_name, length) == 0 &&
            field[length] == ':') {
            for (p = field + length + 1; *p == ' ' || *p == '\t'; p++)
                ;

            /* Skip empty attachment_header_field_name lines. */
            if (strlen (p) > 0) {
                struct stat st;
                if (stat (p, &st) == OK) {
                    if (S_ISREG (st.st_mode)) {
                      /* Don't set the default content type so take
                         make_mime_composition_file_entry() will try
                         to infer it from the file type. */
                        make_mime_composition_file_entry(p, attachformat, 0);
                    } else {
                        adios (NULL, "unable to attach %s, not a plain file",
                               p);
                    }
                } else {
                  adios (NULL, "unable to access file \"%s\"", p);
                }
            }
        }
    }

    (void)fclose(composition_file);

    /*
     *  We're ready to roll!  Run mhbuild on the composition file.
     *  Note that mhbuild is in the context as buildmimeproc.
     */

    (void)sprintf(buf, "%s %s", buildmimeproc, composition_file_name);

    if (system(buf) != 0) {
        clean_up_temporary_files();
        return (NOTOK);
    }

    return (OK);
}

static  void
clean_up_temporary_files(void)
{
    (void)unlink(body_file_name);
    (void)unlink(composition_file_name);

    return;
}

static  int
get_line(void)
{
    int         c;      /* current character */
    int         n;      /* number of bytes in buffer */
    char        *p;     /* buffer pointer */

    /*
     *  Get a line from the input file, growing the field buffer as needed.  We do this
     *  so that we can fit an entire line in the buffer making it easy to do a string
     *  comparison on both the field name and the field body which might be a long path
     *  name.
     */

    for (n = 0, p = field; (c = getc(draft_file)) != EOF; *p++ = c) {
        if (c == '\n' && (c = getc(draft_file)) != ' ' && c != '\t') {
            (void)ungetc(c, draft_file);
            c = '\n';
            break;
        }

        if (++n >= field_size - 1) {
            field = (char *)mh_xrealloc((void *)field, field_size += 256);

            p = field + n - 1;
        }
    }

    /*
     *  NUL-terminate the field..
     */

    *p = '\0';

    return (c);
}

static  void
make_mime_composition_file_entry(char *file_name, int attachformat,
                                 char *default_content_type)
{
    int                 binary;                 /* binary character found flag */
    int                 c;                      /* current character */
    char                cmd[PATH_MAX + 6];      /* file command buffer */
    char                *content_type;          /* mime content type */
    FILE                *fp;                    /* content and pipe file pointer */
    struct      node    *np;                    /* context scan node pointer */
    char                *p;                     /* miscellaneous string pointer */
    struct      stat    st;                     /* file status buffer */

    content_type = default_content_type;

    /*
     *  Check the file name for a suffix.  Scan the context for that suffix on a
     *  mhshow-suffix- entry.  We use these entries to be compatible with mhnshow,
     *  and there's no reason to make the user specify each suffix twice.  Context
     *  entries of the form "mhshow-suffix-contenttype" in the name have the suffix
     *  in the field, including the dot.
     */

    if ((p = strrchr(file_name, '.')) != (char *)0) {
        for (np = m_defs; np; np = np->n_next) {
            if (strncasecmp(np->n_name, "mhshow-suffix-", 14) == 0 && mh_strcasecmp(p, np->n_field) == 0) {
                content_type = np->n_name + 14;
                break;
            }
        }
    }

    /*
     *  No content type was found, either because there was no matching entry in the
     *  context or because the file name has no suffix.  Open the file and check for
     *  non-ASCII characters.  Choose the content type based on this check.
     */

    if (content_type == (char *)0) {
        if ((fp = fopen(file_name, "r")) == (FILE *)0) {
            clean_up_temporary_files();
            adios((char *)0, "unable to access file \"%s\"", file_name);
        }

        binary = 0;

        while ((c = getc(fp)) != EOF) {
            if (c > 127 || c < 0) {
                binary = 1;
                break;
            }
        }

        (void)fclose(fp);

        content_type = binary ? "application/octet-stream" : "text/plain";
    }

    /*
     *  Make sure that the attachment file exists and is readable.  Append a mhbuild
     *  directive to the draft file.  This starts with the content type.  Append a
     *  file name attribute and a private x-unix-mode attribute.  Also append a
     *  description obtained (if possible) by running the "file" command on the file.
     */

    if (stat(file_name, &st) == -1 || access(file_name, R_OK) != 0) {
        clean_up_temporary_files();
        adios((char *)0, "unable to access file \"%s\"", file_name);
    }

    switch (attachformat) {
    case 0:
        /* Insert name, file mode, and Content-Id. */
        (void)fprintf(composition_file, "#%s; name=\"%s\"; x-unix-mode=0%.3ho",
            content_type, ((p = strrchr(file_name, '/')) == (char *)0) ? file_name : p + 1, (unsigned short)(st.st_mode & 0777));

        if (strlen(file_name) > PATH_MAX) {
            clean_up_temporary_files();
            adios((char *)0, "attachment file name `%s' too long.", file_name);
        }

        (void)sprintf(cmd, "file '%s'", file_name);

        if ((fp = popen(cmd, "r")) != (FILE *)0 && fgets(cmd, sizeof (cmd), fp) != (char *)0) {
            *strchr(cmd, '\n') = '\0';

            /*
             *  The output of the "file" command is of the form
             *
             *          file:   description
             *
             *  Strip off the "file:" and subsequent white space.
             */

            for (p = cmd; *p != '\0'; p++) {
                if (*p == ':') {
                    for (p++; *p != '\0'; p++) {
                        if (*p != '\t')
                            break;
                    }
                    break;
                }
            }

            if (*p != '\0')
                /* Insert Content-Description. */
                (void)fprintf(composition_file, " [ %s ]", p);

            (void)pclose(fp);
        }

        break;
    case 1:
        if (stringdex (m_maildir(invo_name), file_name) == 0) {
            /* Content had been placed by send into a temp file.
               Don't generate Content-Disposition header, because
               it confuses Microsoft Outlook, Build 10.0.6626, at
               least. */
            (void) fprintf (composition_file, "#%s <>", content_type);
        } else {
            /* Suppress Content-Id, insert simple Content-Disposition
               and Content-Description with filename. */
            p = strrchr(file_name, '/');
            (void) fprintf (composition_file,
                            "#%s; name=\"%s\" <> [%s]{attachment}",
                            content_type,
                            (p == (char *)0) ? file_name : p + 1,
                            (p == (char *)0) ? file_name : p + 1);
        }

        break;
    case 2:
        if (stringdex (m_maildir(invo_name), file_name) == 0) {
            /* Content had been placed by send into a temp file.
               Don't generate Content-Disposition header, because
               it confuses Microsoft Outlook, Build 10.0.6626, at
               least. */
            (void) fprintf (composition_file, "#%s <>", content_type);
        } else {
            /* Suppress Content-Id, insert Content-Disposition with
               modification date and Content-Description wtih filename. */
            p = strrchr(file_name, '/');
            (void) fprintf (composition_file,
                            "#%s; name=\"%s\" <>[%s]{attachment; modification-date=\"%s\"}",
                            content_type,
                            (p == (char *)0) ? file_name : p + 1,
                            (p == (char *)0) ? file_name : p + 1,
                            dtime (&st.st_mtime, 0));
        }

        break;
    default:
        adios ((char *)0, "unsupported attachformat %d", attachformat);
    }

    /*
     *  Finish up with the file name.
     */

    (void)fprintf(composition_file, " %s\n", file_name);

    return;
}

/*
 * 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;;) {
        int bufsz = sizeof buffer;
        switch (state = m_getfld (state, name, buffer, &bufsz, in)) {
            case FLD:
            case FLDPLUS:
            case FLDEOF:
                compnum++;

                /*
                 * This header field is discarded.
                 */
                if (!mh_strcasecmp (name, "Message-ID")) {
                    while (state == FLDPLUS) {
                        bufsz = sizeof buffer;
                        state = m_getfld (state, name, buffer, &bufsz, in);
                    }
                } else if (uprf (name, XXX_FIELD_PRF)
                        || !mh_strcasecmp (name, VRSN_FIELD)
                        || !mh_strcasecmp (name, "Subject")
                        || !mh_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 (!mh_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) {
                        bufsz = sizeof buffer;
                        state = m_getfld (state, name, buffer, &bufsz, 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) {
                        bufsz = sizeof buffer;
                        state = m_getfld (state, name, buffer, &bufsz, 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), "%s", message_id (clock, 0));

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

        char *cp = m_mktemp2(drft, invo_name, NULL, &out);
        if (cp == NULL) {
            adios (drft, "unable to create temporary file for");
        }
        strncpy(tmpdrf, cp, sizeof(tmpdrf));
        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 *tfile = NULL;

    tfile = m_mktemp2(NULL, invo_name, &fd, NULL);
    if (tfile == NULL) return NOTOK;
    fchmod(fd, 0600);

    if (debugsw)
        advise (NULL, "temporary file %s selected", tfile);
    else
        if (unlink (tfile) == NOTOK)
            advise (tfile, "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", folder);
        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, -2, 0);
        }
    }

    free (cp);

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


static void
armed_done (int status)
{
    longjmp (env, status ? status : NOTOK);

    exit (status);
}