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/* direvent - directory content watcher daemon
Copyright (C) 2012-2016 Sergey Poznyakoff
Direvent is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
Direvent is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with direvent. If not, see <http://www.gnu.org/licenses/>. */
#include "direvent.h"
#include "wordsplit.h"
#include <ctype.h>
extern char **environ; /* Environment */
#define DEBUG_ENVIRON(l,env) do { \
if (debug_level >= (l)) { \
diag(LOG_DEBUG, _("environment: ")); \
for (i = 0; (env)[i]; i++) \
diag(LOG_DEBUG, "%s ", (env)[i]); \
diag(LOG_DEBUG, "\n"); \
} \
} while (0)
static int
find_env_pos(char **env, char *name, size_t *idx, size_t *valoff)
{
size_t nlen = strcspn(name, "+=");
size_t i;
for (i = 0; env[i]; i++) {
size_t elen = strcspn(env[i], "=");
if (elen == nlen && memcmp(name, env[i], nlen) == 0) {
if (idx)
*idx = i;
if (valoff)
*valoff = elen + 1;
return 0;
}
}
return -1;
}
static char *
find_env_ptr(char **env, char *name, int val)
{
size_t i, j;
if (find_env_pos(env, name, &i, &j))
return NULL;
return val ? env[i] + j : env[i];
}
static int
var_is_unset(char **env, const char *name)
{
int i;
int nlen = strcspn(name, "=");
for (i = 0; env[i]; i++) {
if (env[i][0] == '-') {
size_t elen = strcspn(env[i] + 1, "=");
if (elen == nlen &&
memcmp(name, env[i] + 1, nlen) == 0) {
if (env[i][nlen + 1])
return strcmp(name + nlen,
env[i] + 1 + nlen) == 0;
else
return 1;
}
}
}
return 0;
}
static char *
env_concat(const char *name, size_t namelen, const char *a, const char *b)
{
char *res;
size_t len;
if (a && b) {
res = emalloc(namelen + 1 + strlen(a) + strlen(b) + 1);
strcpy(res + namelen + 1, a);
strcat(res + namelen + 1, b);
} else if (a) {
len = strlen(a);
if (ispunct(a[len-1]))
len--;
res = emalloc(namelen + 1 + len + 1);
memcpy(res + namelen + 1, a, len);
res[namelen + 1 + len] = 0;
}
else { /* if (a == NULL) */
if (ispunct(b[0]))
b++;
len = strlen(b);
res = emalloc(namelen + 1 + len + 1);
strcpy(res + namelen + 1, b);
}
memcpy(res, name, namelen);
res[namelen] = '=';
return res;
}
static char *defenv[] = {
"DIREVENT_SYSEV_CODE=${sysev_code}",
"DIREVENT_SYSEV_NAME=${sysev_name}",
"DIREVENT_GENEV_CODE=${genev_code}",
"DIREVENT_GENEV_NAME=${genev_name}",
"DIREVENT_FILE=${file}",
NULL
};
char **
environ_setup(char **hint, char **kve)
{
char *empty[1] = { NULL };
char **old_env = environ;
char **new_env;
char **addenv = defenv;
char *var;
size_t count, i, j, n;
struct wordsplit ws;
int wsflags = WRDSF_NOCMD | WRDSF_QUOTE | WRDSF_NOSPLIT |
WRDSF_ENV | WRDSF_ENV_KV;
ws.ws_env = (const char **) kve;
if (!hint)
hint = empty;
else if (strcmp(hint[0], "-") == 0 || strcmp(hint[0], "--") == 0) {
old_env = NULL;
if (hint[0][1] == '-')
addenv = empty;
hint++;
}
/* Count new environment size */
count = 0;
if (old_env)
for (i = 0; old_env[i]; i++)
count++;
for (i = 0; addenv[i]; i++)
count++;
for (i = 0; hint[i]; i++)
count++;
if (self_test_pid)
count++;
/* Allocate new environment. */
new_env = ecalloc(count + 1, sizeof new_env[0]);
/* Populate the environment. */
n = 0;
if (old_env)
for (i = 0; old_env[i]; i++) {
if (!var_is_unset(hint, old_env[i]))
new_env[n++] = old_env[i];
}
for (i = 0; addenv[i]; i++)
if (!var_is_unset(hint, addenv[i])) {
if (wordsplit(addenv[i], &ws, wsflags)) {
diag(LOG_CRIT, "wordsplit: %s",
wordsplit_strerror(&ws));
_exit(127);
}
wsflags |= WRDSF_REUSE;
new_env[n++] = estrdup(ws.ws_wordv[0]);
}
for (i = 0; hint[i]; i++) {
char *p;
if (hint[i][0] == '-') {
/* Skip unset directives. */
continue;
}
if (wordsplit(hint[i], &ws, wsflags)) {
diag(LOG_CRIT, "wordsplit: %s",
wordsplit_strerror(&ws));
_exit(127);
}
wsflags |= WRDSF_REUSE;
var = ws.ws_wordv[0];
/* Find the slot for the variable. Use next available
slot if there's no such variable in new_env */
if (find_env_pos(new_env, hint[i], &j, NULL))
j = n;
if ((p = strchr(var, '='))) {
if (p == var)
continue; /* Ignore erroneous entry */
if (p[-1] == '+')
new_env[j] = env_concat(var,
p - var - 1,
find_env_ptr(environ,
var, 1),
p + 1);
else if (p[1] == '+')
new_env[j] = env_concat(var,
p - var,
p + 2,
find_env_ptr(environ,
var, 1));
else
new_env[j] = estrdup(var);
} else if ((p = find_env_ptr(environ, hint[i], 0)))
new_env[j] = p;
else
continue;
/* Adjust environment size */
if (j == n)
++n;
}
if (self_test_pid) {
char buf[512];
snprintf(buf, sizeof buf, "DIREVENT_SELF_TEST_PID=%lu",
(unsigned long)self_test_pid);
new_env[n++] = estrdup(buf);;
}
new_env[n] = NULL;
if (wsflags & WRDSF_REUSE)
wordsplit_free(&ws);
return new_env;
}
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