* libmisc/limits.c: Re-indent.
* libmisc/limits.c: Reformat the documentation. Avoid personal comments. * man/limits.5.xml: Document the new features.
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nekral-guest
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13
ChangeLog
13
ChangeLog
@ -1,10 +1,15 @@
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2010-03-18 Nicolas François <nicolas.francois@centraliens.net>
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* libmisc/limits.c: Re-indent.
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* libmisc/limits.c: Reformat the documentation. Avoid personal
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comments.
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* man/limits.5.xml: Document the new features.
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2010-03-18 Thomas Orgis <thomas@orgis.org>
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* NEWS, libmisc/limits.c: Fix parsing of limits.
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* NEWS, libmisc/limits.c, man/limits.5.xml: Add support for
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infinite limits.
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* NEWS, libmisc/limits.c, man/limits.5.xml: Add support for @group
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syntax.
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* NEWS, libmisc/limits.c: Add support for infinite limits.
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* NEWS, libmisc/limits.c: Add support for @group syntax.
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2010-03-18 Nicolas François <nicolas.francois@centraliens.net>
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135
libmisc/limits.c
135
libmisc/limits.c
@ -33,7 +33,7 @@
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/*
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* Separated from setup.c. --marekm
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* Resource limits thanks to Cristian Gafton.
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* Enhancements of resource limit code by Thomas Orgis <thomas@orgis.org> ("thor").
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* Enhancements of resource limit code by Thomas Orgis <thomas@orgis.org>
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*/
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#include <config.h>
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@ -66,36 +66,40 @@
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* value - string value to be read
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* multiplier - value*multiplier is the actual limit
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*/
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static int
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setrlimit_value (unsigned int resource, const char *value,
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static int setrlimit_value (unsigned int resource,
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const char *value,
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unsigned int multiplier)
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{
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struct rlimit rlim;
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rlim_t limit;
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/* The "-" is special, not belonging to a strange negative limit.
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It is infinity, in a controlled way. --thor */
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if(value[0] == '-') {
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* It is infinity, in a controlled way.
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*/
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if ('-' == value[0]) {
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limit = RLIM_INFINITY;
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}
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else {
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/* We cannot use getlong here because it fails when there
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is more to the value than just this number!
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Also, we are limited to base 10 here (hex numbers will not
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work with the limit string parser as is anyway) --thor */
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* is more to the value than just this number!
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* Also, we are limited to base 10 here (hex numbers will not
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* work with the limit string parser as is anyway)
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*/
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char *endptr;
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long longlimit = strtol (value, &endptr, 10);
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if ((0 == longlimit) && (value == endptr)) {
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/* No argument at all. No-op.
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We could instead throw an error, though. --thor */
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* FIXME: We could instead throw an error, though.
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*/
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return 0;
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}
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longlimit *= multiplier;
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limit = (rlim_t)longlimit;
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if (longlimit != limit)
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{
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/* Again, silent error handling... I left it that way.
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Wouldn't screaming make more sense? --thor */
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/* FIXME: Again, silent error handling...
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* Wouldn't screaming make more sense?
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*/
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return 0;
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}
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}
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@ -221,8 +225,8 @@ static int check_logins (const char *name, const char *maxlogins)
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* [Ii]: i = RLIMIT_NICE max nice value (0..39 translates to 20..-19)
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* [Oo]: o = RLIMIT_RTPRIO max real time priority (linux/sched.h 0..MAX_RT_PRIO)
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*
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* Remember to extend the "no-limits" string below when adding a new limit...
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* --thor
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* NOTE: Remember to extend the "no-limits" string below when adding a new
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* limit...
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*
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* Return value:
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* 0 = okay, of course
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@ -239,17 +243,22 @@ static int do_user_limits (const char *buf, const char *name)
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bool reported = false;
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pp = buf;
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/* Skip leading whitespace. --thor */
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while(*pp == ' ' || *pp == '\t') ++pp;
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/* Skip leading whitespace. */
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while ((' ' == *pp) || ('\t' == *pp)) {
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pp++;
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}
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/* The special limit string "-" results in no limit for all known limits.
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We achieve that by parsing a full limit string, parts of it being ignored
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if a limit type is not known to the system.
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Though, there will be complaining for unknown limit types. --thor */
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/* The special limit string "-" results in no limit for all known
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* limits.
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* We achieve that by parsing a full limit string, parts of it
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* being ignored if a limit type is not known to the system.
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* Though, there will be complaining for unknown limit types.
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*/
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if (strcmp (pp, "-") == 0) {
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/* Remember to extend this, too, when adding new limits!
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Oh... but "unlimited" does not make sense for umask, or does it?
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--thor */
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* Oh... but "unlimited" does not make sense for umask,
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* or does it?
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*/
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pp = "A- C- D- F- M- N- R- S- T- P- I- O-";
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}
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@ -354,10 +363,12 @@ static int do_user_limits (const char *buf, const char *name)
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break;
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default:
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/* Only report invalid strings once */
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/* Note: A string can be invalid just because a specific (theoretically
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valid) setting is not supported by this build.
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It is just a warning in syslog anyway. The line is still processed
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--thor */
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/* Note: A string can be invalid just because a
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* specific (theoretically valid) setting is not
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* supported by this build.
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* It is just a warning in syslog anyway. The line
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* is still processed
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*/
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if (!reported) {
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SYSLOG ((LOG_WARN,
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"Invalid limit string: '%s'",
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@ -366,13 +377,18 @@ static int do_user_limits (const char *buf, const char *name)
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retval |= LOGIN_ERROR_RLIMIT;
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}
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}
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/* After parsing one limit setting (or just complaining about it),
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one still needs to skip its argument to prevent a bogus warning on
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trying to parse that as limit specification.
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So, let's skip all digits, "-" and our limited set of whitespace.
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--thor */
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while(isdigit(*pp) || *pp == '-' || *pp == ' ' || *pp == '\t') {
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++pp;
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/* After parsing one limit setting (or just complaining
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* about it), one still needs to skip its argument to
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* prevent a bogus warning on trying to parse that as
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* limit specification.
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* So, let's skip all digits, "-" and our limited set of
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* whitespace.
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*/
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while ( isdigit (*pp)
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|| ('-' == *pp)
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|| (' ' == *pp)
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|| ('\t' ==*pp)) {
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pp++;
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}
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}
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return retval;
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@ -381,32 +397,28 @@ static int do_user_limits (const char *buf, const char *name)
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/* Check if user uname is in the group gname.
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* Can I be sure that gr_mem contains no UID as string?
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* Returns true when user is in the group, false when not.
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* Any error is treated as false. --thor
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* Any error is treated as false.
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*/
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static bool user_in_group (const char *uname, const char *gname)
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{
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struct group *groupdata;
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char **member;
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if (uname == NULL || gname == NULL){
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return false;
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}
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/* We are not claiming to be re-entrant!
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* In case of paranoia or a multithreaded login program,
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* one needs to add some mess for getgrnam_r. */
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groupdata = getgrnam (gname);
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if(groupdata == NULL) {
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SYSLOG ((LOG_WARN, "Nonexisting group `%s' in limits file.", gname));
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if (NULL == groupdata) {
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SYSLOG ((LOG_WARN, "Nonexisting group `%s' in limits file.",
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gname));
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return false;
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}
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/* Now look for our user in the list of members. */
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member = groupdata->gr_mem;
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while(*member != NULL) {
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if(strcmp(*member, uname) == 0) {
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return true;
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}
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++member;
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}
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return false;
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return is_on_list (groupdata->gr_mem, uname);
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}
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static int setup_user_limits (const char *uname)
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@ -432,8 +444,10 @@ static int setup_user_limits (const char *uname)
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}
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/* The limits file have the following format:
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* - '#' (comment) chars only as first chars on a line;
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* - username must start on first column (or *, or @group --thor)
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* A better (smarter) checking should be done --cristiang */
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* - username must start on first column (or *, or @group)
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*
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* FIXME: A better (smarter) checking should be done
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*/
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while (fgets (buf, 1024, fil) != NULL) {
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if (('#' == buf[0]) || ('\n' == buf[0])) {
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continue;
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@ -445,15 +459,20 @@ static int setup_user_limits (const char *uname)
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* username L2 D2048 R4096
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* where spaces={' ',\t}. Also, we reject invalid limits.
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* Imposing a limit should be done with care, so a wrong
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* entry means no care anyway :-). A '-' as a limits
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* strings means no limits --cristiang */
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/* In addition to the handling of * as name which was alrady present,
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I added handling of the @group syntax.
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To clarify: The first entry with matching user name rules,
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everything after it is ignored. If there is no user entry,
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the last encountered entry for a matching group rules.
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If there is no matching group entry, the default limits rule.
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--thor. */
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* entry means no care anyway :-).
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*
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* A '-' as a limits strings means no limits
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*
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* The username can also be:
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* '*': the default limits (only the last is taken into
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* account)
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* @group: the limit applies to the members of the group
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*
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* To clarify: The first entry with matching user name rules,
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* everything after it is ignored. If there is no user entry,
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* the last encountered entry for a matching group rules.
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* If there is no matching group entry, the default limits rule.
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*/
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if (sscanf (buf, "%s%[ACDFMNRSTULPIOacdfmnrstulpio0-9 \t-]",
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name, tempbuf) == 2) {
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if (strcmp (name, uname) == 0) {
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@ -462,8 +481,10 @@ static int setup_user_limits (const char *uname)
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} else if (strcmp (name, "*") == 0) {
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strcpy (deflimits, tempbuf);
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} else if (name[0] == '@') {
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/* If the user is in the group, the group limits apply unless
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later a line for the specific user is found. --thor */
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/* If the user is in the group, the group
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* limits apply unless later a line for
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* the specific user is found.
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*/
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if (user_in_group (uname, name+1)) {
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strcpy (limits, tempbuf);
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}
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