mutt_header.c

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#include "config.h"
#include <stddef.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include "mutt/lib.h"
#include "email/lib.h"
#include "core/lib.h"
#include "alias/lib.h"
#include "gui/lib.h"
#include "mutt.h"
#include "mutt_header.h"
#include "enter/lib.h"
#include "index/lib.h"
#include "ncrypt/lib.h"
#include "postpone/lib.h"
#include "send/lib.h"
#include "globals.h" // IWYU pragma: keep
#include "muttlib.h"
 
static void label_ref_dec(struct Mailbox *m, char *label)
{
  struct HashElem *he = mutt_hash_find_elem(m->label_hash, label);
  if (!he)
    return;
 
  uintptr_t count = (uintptr_t) he->data;
  if (count <= 1)
  {
    mutt_hash_delete(m->label_hash, label, NULL);
    return;
  }
 
  count--;
  he->data = (void *) count;
}
 
static void label_ref_inc(struct Mailbox *m, char *label)
{
  uintptr_t count;
 
  struct HashElem *he = mutt_hash_find_elem(m->label_hash, label);
  if (!he)
  {
    count = 1;
    mutt_hash_insert(m->label_hash, label, (void *) count);
    return;
  }
 
  count = (uintptr_t) he->data;
  count++;
  he->data = (void *) count;
}
 
static bool label_message(struct Mailbox *m, struct Email *e, char *new_label)
{
  if (!e)
    return false;
  if (mutt_str_equal(e->env->x_label, new_label))
    return false;
 
  if (e->env->x_label)
    label_ref_dec(m, e->env->x_label);
  if (mutt_str_replace(&e->env->x_label, new_label))
    label_ref_inc(m, e->env->x_label);
 
  e->changed = true;
  e->env->changed |= MUTT_ENV_CHANGED_XLABEL;
  return true;
}
 
int mutt_label_message(struct Mailbox *m, struct EmailList *el)
{
  if (!m || !el)
    return 0;
 
  int changed = 0;
  struct Buffer *buf = mutt_buffer_pool_get();
 
  struct EmailNode *en = STAILQ_FIRST(el);
  if (!STAILQ_NEXT(en, entries))
  {
    // If there's only one email, use its label as a template
    if (en->email->env->x_label)
      mutt_buffer_strcpy(buf, en->email->env->x_label);
  }
 
  if (mutt_buffer_get_field("Label: ", buf, MUTT_COMP_LABEL /* | MUTT_COMP_CLEAR */,
                            false, NULL, NULL, NULL) != 0)
  {
    goto done;
  }
 
  char *new_label = buf->data;
  SKIPWS(new_label);
  if (*new_label == '\0')
    new_label = NULL;
 
  STAILQ_FOREACH(en, el, entries)
  {
    if (label_message(m, en->email, new_label))
    {
      changed++;
      mutt_set_header_color(m, en->email);
    }
  }
 
done:
  mutt_buffer_pool_release(&buf);
  return changed;
}
 
void mutt_edit_headers(const char *editor, const char *body, struct Email *e,
                       struct Buffer *fcc)
{
  struct Buffer *path = mutt_buffer_pool_get();
  mutt_buffer_mktemp(path);
  FILE *fp_out = mutt_file_fopen(mutt_buffer_string(path), "w");
  if (!fp_out)
  {
    mutt_perror(mutt_buffer_string(path));
    goto cleanup;
  }
 
  mutt_env_to_local(e->env);
  mutt_rfc822_write_header(fp_out, e->env, NULL, MUTT_WRITE_HEADER_EDITHDRS,
                           false, false, NeoMutt->sub);
  fputc('\n', fp_out); /* tie off the header. */
 
  /* now copy the body of the message. */
  FILE *fp_in = fopen(body, "r");
  if (!fp_in)
  {
    mutt_perror(body);
    mutt_file_fclose(&fp_out);
    goto cleanup;
  }
 
  mutt_file_copy_stream(fp_in, fp_out);
 
  mutt_file_fclose(&fp_in);
  mutt_file_fclose(&fp_out);
 
  struct stat st = { 0 };
  if (stat(mutt_buffer_string(path), &st) == -1)
  {
    mutt_perror(mutt_buffer_string(path));
    goto cleanup;
  }
 
  time_t mtime = mutt_file_decrease_mtime(mutt_buffer_string(path), &st);
  if (mtime == (time_t) -1)
  {
    mutt_perror(mutt_buffer_string(path));
    goto cleanup;
  }
 
  mutt_edit_file(editor, mutt_buffer_string(path));
  if ((stat(mutt_buffer_string(path), &st) != 0) || (mtime == st.st_mtime))
  {
    mutt_debug(LL_DEBUG1, "temp file was not modified\n");
    /* the file has not changed! */
    mutt_file_unlink(mutt_buffer_string(path));
    goto cleanup;
  }
 
  mutt_file_unlink(body);
  mutt_list_free(&e->env->userhdrs);
 
  /* Read the temp file back in */
  fp_in = fopen(mutt_buffer_string(path), "r");
  if (!fp_in)
  {
    mutt_perror(mutt_buffer_string(path));
    goto cleanup;
  }
 
  fp_out = mutt_file_fopen(body, "w");
  if (!fp_out)
  {
    /* intentionally leak a possible temporary file here */
    mutt_file_fclose(&fp_in);
    mutt_perror(body);
    goto cleanup;
  }
 
  struct Envelope *env_new = NULL;
  char buf[1024] = { 0 };
  env_new = mutt_rfc822_read_header(fp_in, NULL, true, false);
  int bytes_read;
  while ((bytes_read = fread(buf, 1, sizeof(buf), fp_in)) > 0)
    fwrite(buf, 1, bytes_read, fp_out);
  mutt_file_fclose(&fp_out);
  mutt_file_fclose(&fp_in);
  mutt_file_unlink(mutt_buffer_string(path));
 
  /* in case the user modifies/removes the In-Reply-To header with
   * $edit_headers set, we remove References: as they're likely invalid;
   * we can simply compare strings as we don't generate References for
   * multiple Message-Ids in IRT anyways */
#ifdef USE_NNTP
  if (!OptNewsSend)
#endif
  {
    if (!STAILQ_EMPTY(&e->env->in_reply_to) &&
        (STAILQ_EMPTY(&env_new->in_reply_to) ||
         !mutt_str_equal(STAILQ_FIRST(&env_new->in_reply_to)->data,
                         STAILQ_FIRST(&e->env->in_reply_to)->data)))
    {
      mutt_list_free(&e->env->references);
    }
  }
 
  /* restore old info. */
  mutt_list_free(&env_new->references);
  STAILQ_SWAP(&env_new->references, &e->env->references, ListNode);
 
  mutt_env_free(&e->env);
  e->env = env_new;
  env_new = NULL;
 
  mutt_expand_aliases_env(e->env);
 
  /* search through the user defined headers added to see if
   * fcc: or attach: or pgp: or smime: was specified */
 
  struct ListNode *np = NULL, *tmp = NULL;
  STAILQ_FOREACH_SAFE(np, &e->env->userhdrs, entries, tmp)
  {
    bool keep = true;
    size_t plen = 0;
 
    // Check for header names: most specific first
    if (fcc && ((plen = mutt_istr_startswith(np->data, "X-Mutt-Fcc:")) ||
                (plen = mutt_istr_startswith(np->data, "Mutt-Fcc:")) ||
                (plen = mutt_istr_startswith(np->data, "fcc:"))))
    {
      const char *p = mutt_str_skip_email_wsp(np->data + plen);
      if (*p)
      {
        mutt_buffer_strcpy(fcc, p);
        mutt_buffer_pretty_mailbox(fcc);
      }
      keep = false;
    }
    // Check for header names: most specific first
    else if ((plen = mutt_istr_startswith(np->data, "X-Mutt-Attach:")) ||
             (plen = mutt_istr_startswith(np->data, "Mutt-Attach:")) ||
             (plen = mutt_istr_startswith(np->data, "attach:")))
    {
      struct Body *body2 = NULL;
      struct Body *parts = NULL;
 
      const char *p = mutt_str_skip_email_wsp(np->data + plen);
      if (*p)
      {
        mutt_buffer_reset(path);
        for (; (p[0] != '\0') && (p[0] != ' ') && (p[0] != '\t'); p++)
        {
          if (p[0] == '\\')
          {
            if (p[1] == '\0')
              break;
            p++;
          }
          mutt_buffer_addch(path, *p);
        }
        p = mutt_str_skip_email_wsp(p);
 
        mutt_buffer_expand_path(path);
        body2 = mutt_make_file_attach(mutt_buffer_string(path), NeoMutt->sub);
        if (body2)
        {
          body2->description = mutt_str_dup(p);
          for (parts = e->body; parts->next; parts = parts->next)
            ; // do nothing
 
          parts->next = body2;
        }
        else
        {
          mutt_buffer_pretty_mailbox(path);
          mutt_error(_("%s: unable to attach file"), mutt_buffer_string(path));
        }
      }
      keep = false;
    }
    // Check for header names: most specific first
    else if (((WithCrypto & APPLICATION_PGP) != 0) &&
             ((plen = mutt_istr_startswith(np->data, "X-Mutt-PGP:")) ||
              (plen = mutt_istr_startswith(np->data, "Mutt-PGP:")) ||
              (plen = mutt_istr_startswith(np->data, "pgp:"))))
    {
      SecurityFlags sec = mutt_parse_crypt_hdr(np->data + plen, false, APPLICATION_PGP);
      if (sec != SEC_NO_FLAGS)
        sec |= APPLICATION_PGP;
      if (sec != e->security)
      {
        e->security = sec;
        notify_send(e->notify, NT_EMAIL, NT_EMAIL_CHANGE, NULL);
      }
      keep = false;
    }
    // Check for header names: most specific first
    else if (((WithCrypto & APPLICATION_SMIME) != 0) &&
             ((plen = mutt_istr_startswith(np->data, "X-Mutt-SMIME:")) ||
              (plen = mutt_istr_startswith(np->data, "Mutt-SMIME:")) ||
              (plen = mutt_istr_startswith(np->data, "smime:"))))
    {
      SecurityFlags sec = mutt_parse_crypt_hdr(np->data + plen, false, APPLICATION_SMIME);
      if (sec != SEC_NO_FLAGS)
        sec |= APPLICATION_SMIME;
      if (sec != e->security)
      {
        e->security = sec;
        notify_send(e->notify, NT_EMAIL, NT_EMAIL_CHANGE, NULL);
      }
      keep = false;
    }
#ifdef MIXMASTER
    // Check for header names: most specific first
    else if ((plen = mutt_istr_startswith(np->data, "X-Mutt-Mix:")) ||
             (plen = mutt_istr_startswith(np->data, "Mutt-Mix:")))
    {
      mutt_list_free(&e->chain);
 
      char *t = strtok(np->data + plen, ", \t\n");
      while (t)
      {
        mutt_list_insert_tail(&e->chain, mutt_str_dup(t));
        t = strtok(NULL, ", \t\n");
      }
      keep = false;
    }
#endif
 
    if (!keep)
    {
      STAILQ_REMOVE(&e->env->userhdrs, np, ListNode, entries);
      FREE(&np->data);
      FREE(&np);
    }
  }
 
cleanup:
  mutt_buffer_pool_release(&path);
}
 
void mutt_make_label_hash(struct Mailbox *m)
{
  /* 131 is just a rough prime estimate of how many distinct
   * labels someone might have in a m.  */
  m->label_hash = mutt_hash_new(131, MUTT_HASH_STRDUP_KEYS);
}
 
void mutt_label_hash_add(struct Mailbox *m, struct Email *e)
{
  if (!m || !m->label_hash)
    return;
  if (e->env->x_label)
    label_ref_inc(m, e->env->x_label);
}
 
void mutt_label_hash_remove(struct Mailbox *m, struct Email *e)
{
  if (!m || !m->label_hash)
    return;
  if (e->env->x_label)
    label_ref_dec(m, e->env->x_label);
}