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/* Author: Wietse Venema <wietse@wzv.win.tue.nl> */
#include "bsd_locl.h"
RCSID("$Id: sysv_environ.c,v 1.23 1997/12/14 23:50:44 assar Exp $");
#ifdef HAVE_ULIMIT_H
#include <ulimit.h>
#endif
#ifndef UL_SETFSIZE
#define UL_SETFSIZE 2
#endif
#include "sysv_default.h"
/*
* Set
*/
static void
read_etc_environment (void)
{
FILE *f;
char buf[BUFSIZ];
f = fopen(_PATH_ETC_ENVIRONMENT, "r");
if (f) {
char *val;
while (fgets (buf, sizeof(buf), f) != NULL) {
if (buf[0] == '\n' || buf[0] == '#')
continue;
buf[strlen(buf) - 1] = '\0';
val = strchr (buf, '=');
if (val == NULL)
continue;
*val = '\0';
setenv(buf, val + 1, 1);
}
fclose (f);
}
}
/*
* Environment variables that are preserved (but may still be overruled by
* other means). Only TERM and TZ appear to survive (SunOS 5.1). These are
* typically inherited from the ttymon process.
*/
static struct preserved {
char *name;
char *value;
} preserved[] = {
{"TZ", 0},
{"TERM", 0},
{0},
};
/*
* Environment variables that are not preserved and that cannot be specified
* via commandline or stdin. Except for the LD_xxx (runtime linker) stuff,
* the list applies to most SYSV systems. The manpage mentions only that
* SHELL and PATH are censored. HOME, LOGNAME and MAIL are always
* overwritten; they are in the list to make the censoring explicit.
*/
static struct censored {
char *prefix;
int length;
} censored[] = {
{"SHELL=", sizeof("SHELL=") - 1},
{"HOME=", sizeof("HOME=") - 1},
{"LOGNAME=", sizeof("LOGNAME=") - 1},
{"MAIL=", sizeof("MAIL=") - 1},
{"CDPATH=", sizeof("CDPATH=") - 1},
{"IFS=", sizeof("IFS=") - 1},
{"PATH=", sizeof("PATH=") - 1},
{"LD_", sizeof("LD_") - 1},
{0},
};
/* sysv_newenv - set up final environment after logging in */
void sysv_newenv(int argc, char **argv, struct passwd *pwd,
char *term, int pflag)
{
unsigned umask_val;
char buf[BUFSIZ];
int count = 0;
struct censored *cp;
struct preserved *pp;
/* Preserve a selection of the environment. */
for (pp = preserved; pp->name; pp++)
pp->value = getenv(pp->name);
/*
* Note: it is a bad idea to assign a static array to the global environ
* variable. Reason is that putenv() can run into problems when it tries
* to realloc() the environment table. Instead, we just clear environ[0]
* and let putenv() work things out.
*/
if (!pflag && environ)
environ[0] = 0;
/* Restore preserved environment variables. */
for (pp = preserved; pp->name; pp++)
if (pp->value)
setenv(pp->name, pp->value, 1);
/* The TERM definition from e.g. rlogind can override an existing one. */
if (term[0])
setenv("TERM", term, 1);
/*
* Environment definitions from the command line overrule existing ones,
* but can be overruled by definitions from stdin. Some variables are
* censored.
*
* Omission: we do not support environment definitions from stdin.
*/
#define STREQN(x,y,l) (x[0] == y[0] && strncmp(x,y,l) == 0)
while (argc && *argv) {
if (strchr(*argv, '=') == 0) {
snprintf(buf, sizeof(buf), "L%d", count++);
setenv(buf, *argv, 1);
} else {
for (cp = censored; cp->prefix; cp++)
if (STREQN(*argv, cp->prefix, cp->length))
break;
if (cp->prefix == 0)
putenv(*argv);
}
argc--, argv++;
}
/* PATH is always reset. */
setenv("PATH", pwd->pw_uid ? default_path : default_supath, 1);
/* Undocumented: HOME, MAIL and LOGNAME are always reset (SunOS 5.1). */
setenv("HOME", pwd->pw_dir, 1);
{
char *sep = "/";
if(KRB4_MAILDIR[strlen(KRB4_MAILDIR) - 1] == '/')
sep = "";
roken_concat(buf, sizeof(buf), KRB4_MAILDIR, sep, pwd->pw_name, NULL);
}
setenv("MAIL", buf, 1);
setenv("LOGNAME", pwd->pw_name, 1);
setenv("USER", pwd->pw_name, 1);
/*
* Variables that may be set according to specifications in the defaults
* file. HZ and TZ are set only if they are still uninitialized.
*
* Extension: when ALTSHELL=YES, we set the SHELL variable even if it is
* /bin/sh.
*/
if (strcasecmp(default_altsh, "YES") == 0)
setenv("SHELL", pwd->pw_shell, 1);
if (default_hz)
setenv("HZ", default_hz, 0);
if (default_timezone)
setenv("TZ", default_timezone, 0);
/* Non-environment stuff. */
if (default_umask) {
if (sscanf(default_umask, "%o", &umask_val) == 1 && umask_val)
umask(umask_val);
}
#ifdef HAVE_ULIMIT
if (default_ulimit) {
long limit_val;
if (sscanf(default_ulimit, "%ld", &limit_val) == 1 && limit_val)
if (ulimit(UL_SETFSIZE, limit_val) < 0)
warn ("ulimit(UL_SETFSIZE, %ld)", limit_val);
}
#endif
read_etc_environment();
}
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