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/*
* mod_env.c
* version 0.0.5
* status beta
* Pass environment variables to CGI/SSI scripts.
*
* Andrew Wilson <Andrew.Wilson@cm.cf.ac.uk> 06.Dec.95
*
* Change log:
* 08.Dec.95 Now allows PassEnv directive to appear more than once in
* conf files.
* 10.Dec.95 optimisation. getenv() only called at startup and used
* to build a fast-to-access table. table used to build
* per-server environment for each request.
* robustness. better able to handle errors in configuration
* files:
* 1) PassEnv directive present, but no environment variable listed
* 2) PassEnv FOO present, but $FOO not present in environment
* 3) no PassEnv directive present
* 23.Dec.95 Now allows SetEnv directive with same semantics as 'sh' setenv:
* SetEnv Var sets Var to the empty string
* SetEnv Var Val sets Var to the value Val
* Values containing whitespace should be quoted, eg:
* SetEnv Var "this is some text"
* Environment variables take their value from the last instance
* of PassEnv / SetEnv to be reached in the configuration file.
* For example, the sequence:
* PassEnv FOO
* SetEnv FOO override
* Causes FOO to take the value 'override'.
* 23.Feb.96 Added UnsetEnv directive to allow environment variables
* to be removed.
* Virtual hosts now 'inherit' parent server environment which
* they're able to overwrite with their own directives or
* selectively ignore with UnsetEnv.
* *** IMPORTANT - the way that virtual hosts inherit their ***
* *** environment variables from the default server's ***
* *** configuration has changed. You should test your ***
* *** configuration carefully before accepting this ***
* *** version of the module in a live webserver which used ***
* *** older versions of the module. ***
*/
#include "httpd.h"
#include "http_config.h"
typedef struct {
table *vars;
char *unsetenv;
int vars_present;
} env_server_config_rec;
module MODULE_VAR_EXPORT env_module;
void *create_env_server_config (pool *p, server_rec *dummy)
{
env_server_config_rec *new =
(env_server_config_rec *) palloc (p, sizeof(env_server_config_rec));
new->vars = make_table (p, 50);
new->unsetenv = "";
new->vars_present = 0;
return (void *) new;
}
void *merge_env_server_configs (pool *p, void *basev, void *addv)
{
env_server_config_rec *base = (env_server_config_rec *)basev;
env_server_config_rec *add = (env_server_config_rec *)addv;
env_server_config_rec *new =
(env_server_config_rec *)palloc (p, sizeof(env_server_config_rec));
table *new_table;
table_entry *elts;
int i;
const char *uenv, *unset;
/*
* new_table = copy_table( p, base->vars );
* foreach $element ( @add->vars ) {
* table_set( new_table, $element.key, $element.val );
* };
* foreach $unsetenv ( @UNSETENV ) {
* table_unset( new_table, $unsetenv );
* }
*/
new_table = copy_table( p, base->vars );
elts = (table_entry *) add->vars->elts;
for ( i = 0; i < add->vars->nelts; ++i ) {
table_set( new_table, elts[i].key, elts[i].val );
}
unset = add->unsetenv;
uenv = getword_conf( p, &unset );
while ( uenv[0] != '\0' ) {
table_unset( new_table, uenv );
uenv = getword_conf( p, &unset );
}
new->vars = new_table;
new->vars_present = base->vars_present || add->vars_present;
return new;
}
const char *add_env_module_vars_passed (cmd_parms *cmd, char *struct_ptr,
const char *arg)
{
env_server_config_rec *sconf =
get_module_config (cmd->server->module_config, &env_module);
table *vars = sconf->vars;
char *env_var;
char *name_ptr;
while (*arg) {
name_ptr = getword_conf (cmd->pool, &arg);
env_var = getenv(name_ptr);
if ( env_var != NULL ) {
sconf->vars_present = 1;
table_set (vars, name_ptr, env_var);
}
}
return NULL;
}
const char *add_env_module_vars_set (cmd_parms *cmd, char *struct_ptr,
const char *arg)
{
env_server_config_rec *sconf =
get_module_config (cmd->server->module_config, &env_module);
table *vars = sconf->vars;
char *name, *value;
name = getword_conf( cmd->pool, &arg );
value = getword_conf( cmd->pool, &arg );
/* name is mandatory, value is optional. no value means
* set the variable to an empty string
*/
if ( (*name == '\0') || (*arg != '\0')) {
return "SetEnv takes one or two arguments. An environment variable name and an optional value to pass to CGI." ;
}
sconf->vars_present = 1;
table_set (vars, name, value);
return NULL;
}
const char *add_env_module_vars_unset (cmd_parms *cmd, char *struct_ptr,
char *arg)
{
env_server_config_rec *sconf =
get_module_config (cmd->server->module_config, &env_module);
sconf->unsetenv = sconf->unsetenv ?
pstrcat( cmd->pool, sconf->unsetenv, " ", arg, NULL ) :
pstrdup( cmd->pool, arg );
return NULL;
}
command_rec env_module_cmds[] = {
{ "PassEnv", add_env_module_vars_passed, NULL,
RSRC_CONF, RAW_ARGS, "a list of environment variables to pass to CGI." },
{ "SetEnv", add_env_module_vars_set, NULL,
RSRC_CONF, RAW_ARGS, "an environment variable name and a value to pass to CGI." },
{ "UnsetEnv", add_env_module_vars_unset, NULL,
RSRC_CONF, RAW_ARGS, "a list of variables to remove from the CGI environment." },
{ NULL },
};
int fixup_env_module(request_rec *r)
{
table *e = r->subprocess_env;
server_rec *s = r->server;
env_server_config_rec *sconf = get_module_config (s->module_config,
&env_module);
table *vars = sconf->vars;
if ( !sconf->vars_present ) return DECLINED;
r->subprocess_env = overlay_tables( r->pool, e, vars );
return OK;
}
module MODULE_VAR_EXPORT env_module = {
STANDARD_MODULE_STUFF,
NULL, /* initializer */
NULL, /* dir config creater */
NULL, /* dir merger --- default is to override */
create_env_server_config, /* server config */
merge_env_server_configs, /* merge server configs */
env_module_cmds, /* command table */
NULL, /* handlers */
NULL, /* filename translation */
NULL, /* check_user_id */
NULL, /* check auth */
NULL, /* check access */
NULL, /* type_checker */
fixup_env_module, /* fixups */
NULL, /* logger */
NULL, /* header parser */
NULL /* child_init */
};
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