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/* $OpenBSD: env.c,v 1.32 2015/11/04 20:28:17 millert Exp $ */
/* Copyright 1988,1990,1993,1994 by Paul Vixie
* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 1997,2000 by Internet Software Consortium, Inc.
*
* 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 ISC DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC 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/types.h>
#include <bitstring.h> /* for structs.h */
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h> /* for structs.h */
#include "macros.h"
#include "structs.h"
#include "funcs.h"
#include "globals.h"
char **
env_init(void)
{
char **p = malloc(sizeof(char *));
if (p != NULL)
p[0] = NULL;
return (p);
}
void
env_free(char **envp)
{
char **p;
for (p = envp; *p != NULL; p++)
free(*p);
free(envp);
}
char **
env_copy(char **envp)
{
int count, i, save_errno;
char **p;
for (count = 0; envp[count] != NULL; count++)
continue;
p = reallocarray(NULL, count+1, sizeof(char *)); /* 1 for the NULL */
if (p != NULL) {
for (i = 0; i < count; i++)
if ((p[i] = strdup(envp[i])) == NULL) {
save_errno = errno;
while (--i >= 0)
free(p[i]);
free(p);
errno = save_errno;
return (NULL);
}
p[count] = NULL;
}
return (p);
}
static char *
env_find(char *name, char **envp, size_t *count)
{
char **ep, *p, *q;
size_t len;
/*
* Find name in envp and return its value along with the
* index it was found at or the length of envp if not found.
* We treat a '=' in name as end of string for env_set().
*/
for (p = name; *p && *p != '='; p++)
continue;
len = (size_t)(p - name);
for (ep = envp; (p = *ep) != NULL; ep++) {
if ((q = strchr(p, '=')) == NULL)
continue;
if ((size_t)(q - p) == len && strncmp(p, name, len) == 0) {
p = q + 1;
break;
}
}
*count = (size_t)(ep - envp);
return (p);
}
char *
env_get(char *name, char **envp)
{
size_t count;
return (env_find(name, envp, &count));
}
char **
env_set(char **envp, char *envstr)
{
size_t count;
char **p, *envcopy;
if ((envcopy = strdup(envstr)) == NULL)
return (NULL);
/* Replace existing name if found. */
if (env_find(envstr, envp, &count) != NULL) {
free(envp[count]);
envp[count] = envcopy;
return (envp);
}
/* Realloc envp and append new variable. */
p = reallocarray(envp, count + 2, sizeof(char **));
if (p == NULL) {
free(envcopy);
return (NULL);
}
p[count++] = envcopy;
p[count] = NULL;
return (p);
}
/* The following states are used by load_env(), traversed in order: */
enum env_state {
NAMEI, /* First char of NAME, may be quote */
NAME, /* Subsequent chars of NAME */
EQ1, /* After end of name, looking for '=' sign */
EQ2, /* After '=', skipping whitespace */
VALUEI, /* First char of VALUE, may be quote */
VALUE, /* Subsequent chars of VALUE */
FINI, /* All done, skipping trailing whitespace */
ERROR /* Error */
};
/* return -1 = end of file
* FALSE = not an env setting (file was repositioned)
* TRUE = was an env setting
*/
int
load_env(char *envstr, FILE *f)
{
long filepos;
int fileline;
enum env_state state;
char name[MAX_ENVSTR], val[MAX_ENVSTR];
char quotechar, *c, *str;
filepos = ftell(f);
fileline = LineNumber;
skip_comments(f);
if (EOF == get_string(envstr, MAX_ENVSTR, f, "\n"))
return (-1);
bzero(name, sizeof name);
bzero(val, sizeof val);
str = name;
state = NAMEI;
quotechar = '\0';
c = envstr;
while (state != ERROR && *c) {
switch (state) {
case NAMEI:
case VALUEI:
if (*c == '\'' || *c == '"')
quotechar = *c++;
state++;
/* FALLTHROUGH */
case NAME:
case VALUE:
if (quotechar) {
if (*c == quotechar) {
state++;
c++;
break;
}
if (state == NAME && *c == '=') {
state = ERROR;
break;
}
} else {
if (state == NAME) {
if (isspace((unsigned char)*c)) {
c++;
state++;
break;
}
if (*c == '=') {
state++;
break;
}
}
}
*str++ = *c++;
break;
case EQ1:
if (*c == '=') {
state++;
str = val;
quotechar = '\0';
} else {
if (!isspace((unsigned char)*c))
state = ERROR;
}
c++;
break;
case EQ2:
case FINI:
if (isspace((unsigned char)*c))
c++;
else
state++;
break;
case ERROR:
/* handled below */
break;
}
}
if (state != FINI && !(state == VALUE && !quotechar)) {
fseek(f, filepos, SEEK_SET);
Set_LineNum(fileline);
return (FALSE);
}
if (state == VALUE) {
/* End of unquoted value: trim trailing whitespace */
c = val + strlen(val);
while (c > val && isspace((unsigned char)c[-1]))
*(--c) = '\0';
}
/* 2 fields from parser; looks like an env setting */
/*
* This can't overflow because get_string() limited the size of the
* name and val fields. Still, it doesn't hurt to be careful...
*/
if (snprintf(envstr, MAX_ENVSTR, "%s=%s", name, val) >= MAX_ENVSTR)
return (FALSE);
return (TRUE);
}
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