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/*
* Copyright (c) 2015 Paul Fariello <paul@fariello.eu>
*
* 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 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/wait.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "editor.h"
#include "error.h"
#include "log.h"
static kp_error_t kp_editor_get_tmp(struct kp_ctx *, struct kp_safe *, char *, size_t);
/*
* Open editor on the given safe.
* Fork, exec $EDITOR and wait for it to return.
* The safe must be open.
*/
kp_error_t
kp_edit(struct kp_ctx *ctx, struct kp_safe *safe)
{
kp_error_t ret;
FILE *fd = NULL;
const char *editor;
char path[PATH_MAX];
pid_t pid;
size_t metadata_len;
assert(safe->open);
kp_editor_get_tmp(ctx, safe, path, PATH_MAX);
editor = getenv("EDITOR");
if (editor == NULL) editor = "vi";
pid = fork();
if (pid == 0) {
if (execlp(editor, editor, path, NULL) < 0) {
ret = KP_ERRNO;
kp_warn(ret, "cannot run editor");
goto clean;
}
}
wait(NULL);
fd = fopen(path, "r");
if (fd == NULL) {
ret = KP_ERRNO;
kp_warn(ret, "cannot open temporary clear text file %s", path);
goto clean;
}
clearerr(fd);
metadata_len = fread(safe->metadata, 1, KP_METADATA_MAX_LEN, fd);
safe->metadata[metadata_len] = '\0';
if ((errno = ferror(fd)) != 0) {
ret = KP_ERRNO;
kp_warn(ret, "error while reading temporary clear text file %s", path);
goto clean;
}
if (!feof(fd)) {
errno = ENOMEM;
ret = KP_ERRNO;
kp_warn(ret, "safe too long, storing only %lu bytes", metadata_len);
goto clean;
}
ret = KP_SUCCESS;
clean:
fclose(fd);
if (unlink(path) < 0) {
kp_warn(KP_ERRNO, "cannot delete temporary clear text file %s"
"ensure to delete it manually to avoid metadata leak",
path);
}
return ret;
}
/*
* Create and open a temporary file in current workspace for later edition.
*/
static kp_error_t
kp_editor_get_tmp(struct kp_ctx *ctx, struct kp_safe *safe, char *path, size_t size)
{
int fd;
size_t metadata_len;
kp_error_t ret;
if (strlcpy(path, ctx->ws_path, size) >= size) {
errno = ENOMEM;
ret = KP_ERRNO;
kp_warn(ret, "memory error");
return ret;
}
if (strlcat(path, "/.kpXXXXXX", size) >= size) {
errno = ENOMEM;
ret = KP_ERRNO;
kp_warn(ret, "memory error");
return ret;
}
if ((fd = mkstemp(path)) < 0) {
ret = KP_ERRNO;
kp_warn(ret, "cannot create temporary file %s", path);
return ret;
}
metadata_len = strlen(safe->metadata);
if (write(fd, safe->metadata, metadata_len) != metadata_len) {
ret = KP_ERRNO;
kp_warn(ret, "cannot dump safe on temp file %s for edition", path);
return ret;
}
if (close(fd) < 0) {
ret = KP_ERRNO;
kp_warn(ret, "cannot close temp file %s with plain safe", path);
return ret;
}
return KP_SUCCESS;
}
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