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deliver-rewrite.c

/* $Id: deliver-rewrite.c,v 1.47 2007/03/28 19:59:57 nicm Exp $ */

/*
 * Copyright (c) 2006 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>
#include <sys/wait.h>

#include <errno.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "fdm.h"
#include "deliver.h"

int    deliver_rewrite_deliver(struct deliver_ctx *, struct actitem *);
void   deliver_rewrite_desc(struct actitem *, char *, size_t);

struct deliver deliver_rewrite = {
      "rewrite",
      DELIVER_WRBACK,
      deliver_rewrite_deliver,
      deliver_rewrite_desc
};

int
deliver_rewrite_deliver(struct deliver_ctx *dctx, struct actitem *ti)
{
      struct account                *a = dctx->account;
      struct mail             *m = dctx->mail;
      struct deliver_rewrite_data   *data = ti->data;
      struct mail             *md = &dctx->wr_mail;
        char                        *s, *cause, *out, *err;
      size_t                         len;
      int                      status;
      struct cmd              *cmd;
      char                    *lbuf;
      size_t                         llen;

      s = replacepath(&data->cmd, m->tags, m, &m->rml);
        if (s == NULL || *s == '\0') {
            log_warnx("%s: empty command", a->name);
            if (s != NULL)
                  xfree(s);
                return (DELIVER_FAILURE);
        }

      log_debug2("%s: rewriting using \"%s\"", a->name, s);

      md->size = 0;

      cmd = cmd_start(s, CMD_IN|CMD_OUT|CMD_ONCE, conf.timeout, m->data,
          m->size, &cause);
      if (cmd == NULL) {
            log_warnx("%s: %s: %s", a->name, s, cause);
            xfree(cause);
            goto error;
      }
      log_debug3("%s: %s: started", a->name, s);

      llen = IO_LINESIZE;
      lbuf = xmalloc(llen);

      do {
            status = cmd_poll(cmd, &out, &err, &lbuf, &llen, &cause);
            if (status > 0) {
                  log_warnx("%s: %s: %s", a->name, s, cause);
                  xfree(cause);
                  xfree(lbuf);
                  goto error;
            }
                  if (status == 0) {
                  if (err != NULL)
                        log_warnx("%s: %s: %s", a->name, s, err);
                  if (out != NULL) {
                        log_debug3("%s: %s: out: %s", a->name, s, out);

                        len = strlen(out);
                        if (len == 0 && md->body == -1)
                              md->body = md->size + 1;

                        if (mail_resize(md, md->size + len + 1) != 0) {
                              log_warn("%s: failed to resize mail",
                                  a->name);
                              goto error;
                        }

                        if (len > 0)
                              memcpy(md->data + md->size, out, len);

                        /* append an LF */
                        md->data[md->size + len] = '\n';
                        md->size += len + 1;
                  }
            }
      } while (status >= 0);

      xfree(lbuf);

      status = -1 - status;
      if (status != 0) {
            log_warnx("%s: %s: command returned %d", a->name, s, status);
            goto error;
      }

      if (md->size == 0) {
            log_warnx("%s: %s: empty mail returned", a->name, s);
            goto error;
      }

      cmd_free(cmd);
      xfree(s);
      return (DELIVER_SUCCESS);

error:
      cmd_free(cmd);
      xfree(s);
      return (DELIVER_FAILURE);
}

void
deliver_rewrite_desc(struct actitem *ti, char *buf, size_t len)
{
      struct deliver_rewrite_data   *data = ti->data;

      xsnprintf(buf, len, "rewrite \"%s\"", data->cmd.str);
}

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