mirror of
https://github.com/freebsd/freebsd-src
synced 2024-09-06 17:18:32 +00:00
Rewrite the rctl(8) utility to make it possible to add multiple rules
in a single run. This speeds up operation with large rulesets. MFC after: 1 month Sponsored by: The FreeBSD Foundation
This commit is contained in:
parent
b89def80f5
commit
0971623e61
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=291447
|
@ -25,7 +25,7 @@
|
|||
.\"
|
||||
.\" $FreeBSD$
|
||||
.\"
|
||||
.Dd November 5, 2015
|
||||
.Dd November 29, 2015
|
||||
.Dt RCTL 8
|
||||
.Os
|
||||
.Sh NAME
|
||||
|
@ -35,22 +35,22 @@
|
|||
.Nm
|
||||
.Op Fl h
|
||||
.Op Fl n
|
||||
.Op Ar filter
|
||||
.Op Ar filter Ar ...
|
||||
.Nm
|
||||
.Fl a
|
||||
.Ar rule
|
||||
.Ar rule Ar ...
|
||||
.Nm
|
||||
.Fl l
|
||||
.Op Fl h
|
||||
.Op Fl n
|
||||
.Ar filter
|
||||
.Ar filter Ar ...
|
||||
.Nm
|
||||
.Fl r
|
||||
.Ar filter
|
||||
.Ar filter Ar ...
|
||||
.Nm
|
||||
.Fl u
|
||||
.Op Fl h
|
||||
.Ar filter
|
||||
.Ar filter Ar ...
|
||||
.Pp
|
||||
.Nm
|
||||
requires the kernel to be compiled with:
|
||||
|
|
|
@ -43,6 +43,7 @@ __FBSDID("$FreeBSD$");
|
|||
#include <grp.h>
|
||||
#include <libutil.h>
|
||||
#include <pwd.h>
|
||||
#include <stdbool.h>
|
||||
#include <stdint.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
|
@ -50,97 +51,60 @@ __FBSDID("$FreeBSD$");
|
|||
|
||||
#define RCTL_DEFAULT_BUFSIZE 128 * 1024
|
||||
|
||||
static id_t
|
||||
parse_user(const char *s)
|
||||
static int
|
||||
parse_user(const char *s, id_t *uidp)
|
||||
{
|
||||
id_t id;
|
||||
char *end;
|
||||
struct passwd *pwd;
|
||||
|
||||
pwd = getpwnam(s);
|
||||
if (pwd != NULL)
|
||||
return (pwd->pw_uid);
|
||||
if (pwd != NULL) {
|
||||
*uidp = pwd->pw_uid;
|
||||
return (0);
|
||||
}
|
||||
|
||||
if (!isnumber(s[0]))
|
||||
errx(1, "uknown user '%s'", s);
|
||||
if (!isnumber(s[0])) {
|
||||
warnx("uknown user '%s'", s);
|
||||
return (1);
|
||||
}
|
||||
|
||||
id = strtod(s, &end);
|
||||
if ((size_t)(end - s) != strlen(s))
|
||||
errx(1, "trailing characters after numerical id");
|
||||
*uidp = strtod(s, &end);
|
||||
if ((size_t)(end - s) != strlen(s)) {
|
||||
warnx("trailing characters after numerical id");
|
||||
return (1);
|
||||
}
|
||||
|
||||
return (id);
|
||||
return (0);
|
||||
}
|
||||
|
||||
static id_t
|
||||
parse_group(const char *s)
|
||||
static int
|
||||
parse_group(const char *s, id_t *gidp)
|
||||
{
|
||||
id_t id;
|
||||
char *end;
|
||||
struct group *grp;
|
||||
|
||||
grp = getgrnam(s);
|
||||
if (grp != NULL)
|
||||
return (grp->gr_gid);
|
||||
if (grp != NULL) {
|
||||
*gidp = grp->gr_gid;
|
||||
return (0);
|
||||
}
|
||||
|
||||
if (!isnumber(s[0]))
|
||||
errx(1, "uknown group '%s'", s);
|
||||
if (!isnumber(s[0])) {
|
||||
warnx("uknown group '%s'", s);
|
||||
return (1);
|
||||
}
|
||||
|
||||
id = strtod(s, &end);
|
||||
if ((size_t)(end - s) != strlen(s))
|
||||
errx(1, "trailing characters after numerical id");
|
||||
*gidp = strtod(s, &end);
|
||||
if ((size_t)(end - s) != strlen(s)) {
|
||||
warnx("trailing characters after numerical id");
|
||||
return (1);
|
||||
}
|
||||
|
||||
return (id);
|
||||
return (0);
|
||||
}
|
||||
|
||||
/*
|
||||
* This routine replaces user/group name with numeric id.
|
||||
*/
|
||||
static char *
|
||||
resolve_ids(char *rule)
|
||||
{
|
||||
id_t id;
|
||||
const char *subject, *textid, *rest;
|
||||
char *resolved;
|
||||
|
||||
subject = strsep(&rule, ":");
|
||||
textid = strsep(&rule, ":");
|
||||
if (textid == NULL)
|
||||
errx(1, "error in rule specification -- no subject");
|
||||
if (rule != NULL)
|
||||
rest = rule;
|
||||
else
|
||||
rest = "";
|
||||
|
||||
if (strcasecmp(subject, "u") == 0)
|
||||
subject = "user";
|
||||
else if (strcasecmp(subject, "g") == 0)
|
||||
subject = "group";
|
||||
else if (strcasecmp(subject, "p") == 0)
|
||||
subject = "process";
|
||||
else if (strcasecmp(subject, "l") == 0 ||
|
||||
strcasecmp(subject, "c") == 0 ||
|
||||
strcasecmp(subject, "class") == 0)
|
||||
subject = "loginclass";
|
||||
else if (strcasecmp(subject, "j") == 0)
|
||||
subject = "jail";
|
||||
|
||||
if (strcasecmp(subject, "user") == 0 && strlen(textid) > 0) {
|
||||
id = parse_user(textid);
|
||||
asprintf(&resolved, "%s:%d:%s", subject, (int)id, rest);
|
||||
} else if (strcasecmp(subject, "group") == 0 && strlen(textid) > 0) {
|
||||
id = parse_group(textid);
|
||||
asprintf(&resolved, "%s:%d:%s", subject, (int)id, rest);
|
||||
} else
|
||||
asprintf(&resolved, "%s:%s:%s", subject, textid, rest);
|
||||
|
||||
if (resolved == NULL)
|
||||
err(1, "asprintf");
|
||||
|
||||
return (resolved);
|
||||
}
|
||||
|
||||
/*
|
||||
* This routine replaces "human-readable" number with its expanded form.
|
||||
* Replace human-readable number with its expanded form.
|
||||
*/
|
||||
static char *
|
||||
expand_amount(char *rule)
|
||||
|
@ -150,8 +114,10 @@ expand_amount(char *rule)
|
|||
char *copy, *expanded;
|
||||
|
||||
copy = strdup(rule);
|
||||
if (copy == NULL)
|
||||
err(1, "strdup");
|
||||
if (copy == NULL) {
|
||||
warn("strdup");
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
subject = strsep(©, ":");
|
||||
subject_id = strsep(©, ":");
|
||||
|
@ -170,8 +136,11 @@ expand_amount(char *rule)
|
|||
assert(resource != NULL);
|
||||
assert(action != NULL);
|
||||
|
||||
if (expand_number(amount, &num))
|
||||
err(1, "expand_number");
|
||||
if (expand_number(amount, &num)) {
|
||||
warnx("invalid numeric value '%s'", amount);
|
||||
free(copy);
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
if (per == NULL)
|
||||
asprintf(&expanded, "%s:%s:%s:%s=%ju", subject, subject_id,
|
||||
|
@ -180,12 +149,72 @@ expand_amount(char *rule)
|
|||
asprintf(&expanded, "%s:%s:%s:%s=%ju/%s", subject, subject_id,
|
||||
resource, action, (uintmax_t)num, per);
|
||||
|
||||
if (expanded == NULL)
|
||||
err(1, "asprintf");
|
||||
if (expanded == NULL) {
|
||||
warn("asprintf");
|
||||
free(copy);
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
return (expanded);
|
||||
}
|
||||
|
||||
|
||||
static char *
|
||||
expand_rule(char *rule, bool resolve_ids)
|
||||
{
|
||||
id_t id;
|
||||
const char *subject, *textid, *rest;
|
||||
char *resolved;
|
||||
int error;
|
||||
|
||||
subject = strsep(&rule, ":");
|
||||
textid = strsep(&rule, ":");
|
||||
if (textid == NULL) {
|
||||
warnx("error in rule specification -- no subject");
|
||||
return (NULL);
|
||||
}
|
||||
if (rule != NULL)
|
||||
rest = rule;
|
||||
else
|
||||
rest = "";
|
||||
|
||||
if (strcasecmp(subject, "u") == 0)
|
||||
subject = "user";
|
||||
else if (strcasecmp(subject, "g") == 0)
|
||||
subject = "group";
|
||||
else if (strcasecmp(subject, "p") == 0)
|
||||
subject = "process";
|
||||
else if (strcasecmp(subject, "l") == 0 ||
|
||||
strcasecmp(subject, "c") == 0 ||
|
||||
strcasecmp(subject, "class") == 0)
|
||||
subject = "loginclass";
|
||||
else if (strcasecmp(subject, "j") == 0)
|
||||
subject = "jail";
|
||||
|
||||
if (resolve_ids &&
|
||||
strcasecmp(subject, "user") == 0 && strlen(textid) > 0) {
|
||||
error = parse_user(textid, &id);
|
||||
if (error != 0)
|
||||
return (NULL);
|
||||
asprintf(&resolved, "%s:%d:%s", subject, (int)id, rest);
|
||||
} else if (resolve_ids &&
|
||||
strcasecmp(subject, "group") == 0 && strlen(textid) > 0) {
|
||||
error = parse_group(textid, &id);
|
||||
if (error != 0)
|
||||
return (NULL);
|
||||
asprintf(&resolved, "%s:%d:%s", subject, (int)id, rest);
|
||||
} else {
|
||||
asprintf(&resolved, "%s:%s:%s", subject, textid, rest);
|
||||
}
|
||||
|
||||
if (resolved == NULL) {
|
||||
warn("asprintf");
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
return (expand_amount(resolved));
|
||||
}
|
||||
|
||||
static char *
|
||||
humanize_ids(char *rule)
|
||||
{
|
||||
|
@ -330,8 +359,8 @@ enosys(void)
|
|||
errx(1, "RACCT/RCTL present, but disabled; enable using kern.racct.enable=1 tunable");
|
||||
}
|
||||
|
||||
static void
|
||||
add_rule(char *rule)
|
||||
static int
|
||||
add_rule(const char *rule)
|
||||
{
|
||||
int error;
|
||||
|
||||
|
@ -339,13 +368,14 @@ add_rule(char *rule)
|
|||
if (error != 0) {
|
||||
if (errno == ENOSYS)
|
||||
enosys();
|
||||
err(1, "rctl_add_rule");
|
||||
warn("rctl_add_rule");
|
||||
}
|
||||
free(rule);
|
||||
|
||||
return (error);
|
||||
}
|
||||
|
||||
static void
|
||||
show_limits(char *filter, int hflag, int nflag)
|
||||
static int
|
||||
show_limits(const char *filter, int hflag, int nflag)
|
||||
{
|
||||
int error;
|
||||
char *outbuf = NULL;
|
||||
|
@ -362,17 +392,18 @@ show_limits(char *filter, int hflag, int nflag)
|
|||
if (error && errno != ERANGE) {
|
||||
if (errno == ENOSYS)
|
||||
enosys();
|
||||
err(1, "rctl_get_limits");
|
||||
warn("rctl_get_limits");
|
||||
}
|
||||
} while (error && errno == ERANGE);
|
||||
|
||||
print_rules(outbuf, hflag, nflag);
|
||||
free(filter);
|
||||
free(outbuf);
|
||||
|
||||
return (error);
|
||||
}
|
||||
|
||||
static void
|
||||
remove_rule(char *filter)
|
||||
static int
|
||||
remove_rule(const char *filter)
|
||||
{
|
||||
int error;
|
||||
|
||||
|
@ -380,9 +411,10 @@ remove_rule(char *filter)
|
|||
if (error != 0) {
|
||||
if (errno == ENOSYS)
|
||||
enosys();
|
||||
err(1, "rctl_remove_rule");
|
||||
warn("rctl_remove_rule");
|
||||
}
|
||||
free(filter);
|
||||
|
||||
return (error);
|
||||
}
|
||||
|
||||
static char *
|
||||
|
@ -419,8 +451,8 @@ humanize_usage_amount(char *usage)
|
|||
/*
|
||||
* Query the kernel about a resource usage and print it out.
|
||||
*/
|
||||
static void
|
||||
show_usage(char *filter, int hflag)
|
||||
static int
|
||||
show_usage(const char *filter, int hflag)
|
||||
{
|
||||
int error;
|
||||
char *outbuf = NULL, *tmp;
|
||||
|
@ -437,7 +469,7 @@ show_usage(char *filter, int hflag)
|
|||
if (error && errno != ERANGE) {
|
||||
if (errno == ENOSYS)
|
||||
enosys();
|
||||
err(1, "rctl_get_racct");
|
||||
warn("rctl_get_racct");
|
||||
}
|
||||
} while (error && errno == ERANGE);
|
||||
|
||||
|
@ -451,15 +483,16 @@ show_usage(char *filter, int hflag)
|
|||
printf("%s\n", tmp);
|
||||
}
|
||||
|
||||
free(filter);
|
||||
free(outbuf);
|
||||
|
||||
return (error);
|
||||
}
|
||||
|
||||
/*
|
||||
* Query the kernel about resource limit rules and print them out.
|
||||
*/
|
||||
static void
|
||||
show_rules(char *filter, int hflag, int nflag)
|
||||
static int
|
||||
show_rules(const char *filter, int hflag, int nflag)
|
||||
{
|
||||
int error;
|
||||
char *outbuf = NULL;
|
||||
|
@ -480,12 +513,14 @@ show_rules(char *filter, int hflag, int nflag)
|
|||
if (error && errno != ERANGE) {
|
||||
if (errno == ENOSYS)
|
||||
enosys();
|
||||
err(1, "rctl_get_rules");
|
||||
warn("rctl_get_rules");
|
||||
}
|
||||
} while (error && errno == ERANGE);
|
||||
|
||||
print_rules(outbuf, hflag, nflag);
|
||||
free(outbuf);
|
||||
|
||||
return (error);
|
||||
}
|
||||
|
||||
static void
|
||||
|
@ -503,30 +538,27 @@ main(int argc __unused, char **argv __unused)
|
|||
int ch, aflag = 0, hflag = 0, nflag = 0, lflag = 0, rflag = 0,
|
||||
uflag = 0;
|
||||
char *rule = NULL;
|
||||
int i, cumulated_error;
|
||||
|
||||
while ((ch = getopt(argc, argv, "a:hl:nr:u:")) != -1) {
|
||||
while ((ch = getopt(argc, argv, "ahlnru")) != -1) {
|
||||
switch (ch) {
|
||||
case 'a':
|
||||
aflag = 1;
|
||||
rule = strdup(optarg);
|
||||
break;
|
||||
case 'h':
|
||||
hflag = 1;
|
||||
break;
|
||||
case 'l':
|
||||
lflag = 1;
|
||||
rule = strdup(optarg);
|
||||
break;
|
||||
case 'n':
|
||||
nflag = 1;
|
||||
break;
|
||||
case 'r':
|
||||
rflag = 1;
|
||||
rule = strdup(optarg);
|
||||
break;
|
||||
case 'u':
|
||||
uflag = 1;
|
||||
rule = strdup(optarg);
|
||||
break;
|
||||
|
||||
case '?':
|
||||
|
@ -537,44 +569,55 @@ main(int argc __unused, char **argv __unused)
|
|||
|
||||
argc -= optind;
|
||||
argv += optind;
|
||||
|
||||
if (aflag + lflag + rflag + uflag > 1)
|
||||
errx(1, "at most one of -a, -l, -r, or -u may be specified");
|
||||
|
||||
if (argc > 1)
|
||||
usage();
|
||||
|
||||
if (rule == NULL) {
|
||||
if (argc == 1)
|
||||
rule = strdup(argv[0]);
|
||||
else
|
||||
if (argc == 0) {
|
||||
if (aflag + lflag + rflag + uflag == 0) {
|
||||
rule = strdup("::");
|
||||
show_rules(rule, hflag, nflag);
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
||||
usage();
|
||||
}
|
||||
|
||||
if (aflag + lflag + rflag + uflag + argc > 1)
|
||||
errx(1, "only one flag or argument may be specified "
|
||||
"at the same time");
|
||||
cumulated_error = 0;
|
||||
|
||||
rule = resolve_ids(rule);
|
||||
rule = expand_amount(rule);
|
||||
for (i = 0; i < argc; i++) {
|
||||
rule = argv[i];
|
||||
|
||||
if (aflag) {
|
||||
add_rule(rule);
|
||||
return (0);
|
||||
/*
|
||||
* Skip resolving if passed -n _and_ -a. Ignore -n otherwise,
|
||||
* so we can still do "rctl -n u:root" and see the rules without
|
||||
* resolving the UID.
|
||||
*/
|
||||
if (aflag != 0 && nflag != 0)
|
||||
rule = expand_rule(rule, false);
|
||||
else
|
||||
rule = expand_rule(rule, true);
|
||||
|
||||
if (rule == NULL) {
|
||||
cumulated_error++;
|
||||
continue;
|
||||
}
|
||||
|
||||
if (aflag) {
|
||||
cumulated_error += add_rule(rule);
|
||||
} else if (lflag) {
|
||||
cumulated_error += show_limits(rule, hflag, nflag);
|
||||
} else if (rflag) {
|
||||
cumulated_error += remove_rule(rule);
|
||||
} else if (uflag) {
|
||||
cumulated_error += show_usage(rule, hflag);
|
||||
} else {
|
||||
cumulated_error += show_rules(rule, hflag, nflag);
|
||||
}
|
||||
|
||||
free(rule);
|
||||
}
|
||||
|
||||
if (lflag) {
|
||||
show_limits(rule, hflag, nflag);
|
||||
return (0);
|
||||
}
|
||||
|
||||
if (rflag) {
|
||||
remove_rule(rule);
|
||||
return (0);
|
||||
}
|
||||
|
||||
if (uflag) {
|
||||
show_usage(rule, hflag);
|
||||
return (0);
|
||||
}
|
||||
|
||||
show_rules(rule, hflag, nflag);
|
||||
return (0);
|
||||
return (cumulated_error);
|
||||
}
|
||||
|
|
Loading…
Reference in a new issue