diff options
Diffstat (limited to 'crypto/kerberosIV/appl/bsd/sysv_environ.c')
| -rw-r--r-- | crypto/kerberosIV/appl/bsd/sysv_environ.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/crypto/kerberosIV/appl/bsd/sysv_environ.c b/crypto/kerberosIV/appl/bsd/sysv_environ.c new file mode 100644 index 0000000..f5e782d --- /dev/null +++ b/crypto/kerberosIV/appl/bsd/sysv_environ.c @@ -0,0 +1,192 @@ +/* Author: Wietse Venema <wietse@wzv.win.tue.nl> */ + +#include "bsd_locl.h" + +RCSID("$Id: sysv_environ.c,v 1.21 1997/05/14 17:34:15 joda 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; + long limit_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 = ""; + k_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) { + 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(); +} + |
