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-rw-r--r--src/libsystemd-basic/src/rlimit-util.c321
1 files changed, 321 insertions, 0 deletions
diff --git a/src/libsystemd-basic/src/rlimit-util.c b/src/libsystemd-basic/src/rlimit-util.c
new file mode 100644
index 0000000000..88792292da
--- /dev/null
+++ b/src/libsystemd-basic/src/rlimit-util.c
@@ -0,0 +1,321 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <sys/resource.h>
+
+#include "systemd-basic/alloc-util.h"
+#include "systemd-basic/extract-word.h"
+#include "systemd-basic/formats-util.h"
+#include "systemd-basic/macro.h"
+#include "systemd-basic/missing.h"
+#include "systemd-basic/rlimit-util.h"
+#include "systemd-basic/string-table.h"
+#include "systemd-basic/time-util.h"
+
+int setrlimit_closest(int resource, const struct rlimit *rlim) {
+ struct rlimit highest, fixed;
+
+ assert(rlim);
+
+ if (setrlimit(resource, rlim) >= 0)
+ return 0;
+
+ if (errno != EPERM)
+ return -errno;
+
+ /* So we failed to set the desired setrlimit, then let's try
+ * to get as close as we can */
+ assert_se(getrlimit(resource, &highest) == 0);
+
+ fixed.rlim_cur = MIN(rlim->rlim_cur, highest.rlim_max);
+ fixed.rlim_max = MIN(rlim->rlim_max, highest.rlim_max);
+
+ if (setrlimit(resource, &fixed) < 0)
+ return -errno;
+
+ return 0;
+}
+
+static int rlimit_parse_u64(const char *val, rlim_t *ret) {
+ uint64_t u;
+ int r;
+
+ assert(val);
+ assert(ret);
+
+ if (streq(val, "infinity")) {
+ *ret = RLIM_INFINITY;
+ return 0;
+ }
+
+ /* setrlimit(2) suggests rlim_t is always 64bit on Linux. */
+ assert_cc(sizeof(rlim_t) == sizeof(uint64_t));
+
+ r = safe_atou64(val, &u);
+ if (r < 0)
+ return r;
+ if (u >= (uint64_t) RLIM_INFINITY)
+ return -ERANGE;
+
+ *ret = (rlim_t) u;
+ return 0;
+}
+
+static int rlimit_parse_size(const char *val, rlim_t *ret) {
+ uint64_t u;
+ int r;
+
+ assert(val);
+ assert(ret);
+
+ if (streq(val, "infinity")) {
+ *ret = RLIM_INFINITY;
+ return 0;
+ }
+
+ r = parse_size(val, 1024, &u);
+ if (r < 0)
+ return r;
+ if (u >= (uint64_t) RLIM_INFINITY)
+ return -ERANGE;
+
+ *ret = (rlim_t) u;
+ return 0;
+}
+
+static int rlimit_parse_sec(const char *val, rlim_t *ret) {
+ uint64_t u;
+ usec_t t;
+ int r;
+
+ assert(val);
+ assert(ret);
+
+ if (streq(val, "infinity")) {
+ *ret = RLIM_INFINITY;
+ return 0;
+ }
+
+ r = parse_sec(val, &t);
+ if (r < 0)
+ return r;
+ if (t == USEC_INFINITY) {
+ *ret = RLIM_INFINITY;
+ return 0;
+ }
+
+ u = (uint64_t) DIV_ROUND_UP(t, USEC_PER_SEC);
+ if (u >= (uint64_t) RLIM_INFINITY)
+ return -ERANGE;
+
+ *ret = (rlim_t) u;
+ return 0;
+}
+
+static int rlimit_parse_usec(const char *val, rlim_t *ret) {
+ usec_t t;
+ int r;
+
+ assert(val);
+ assert(ret);
+
+ if (streq(val, "infinity")) {
+ *ret = RLIM_INFINITY;
+ return 0;
+ }
+
+ r = parse_time(val, &t, 1);
+ if (r < 0)
+ return r;
+ if (t == USEC_INFINITY) {
+ *ret = RLIM_INFINITY;
+ return 0;
+ }
+
+ *ret = (rlim_t) t;
+ return 0;
+}
+
+static int rlimit_parse_nice(const char *val, rlim_t *ret) {
+ uint64_t rl;
+ int r;
+
+ /* So, Linux is weird. The range for RLIMIT_NICE is 40..1, mapping to the nice levels -20..19. However, the
+ * RLIMIT_NICE limit defaults to 0 by the kernel, i.e. a value that maps to nice level 20, which of course is
+ * bogus and does not exist. In order to permit parsing the RLIMIT_NICE of 0 here we hence implement a slight
+ * asymmetry: when parsing as positive nice level we permit 0..19. When parsing as negative nice level, we
+ * permit -20..0. But when parsing as raw resource limit value then we also allow the special value 0.
+ *
+ * Yeah, Linux is quality engineering sometimes... */
+
+ if (val[0] == '+') {
+
+ /* Prefixed with "+": Parse as positive user-friendly nice value */
+ r = safe_atou64(val + 1, &rl);
+ if (r < 0)
+ return r;
+
+ if (rl >= PRIO_MAX)
+ return -ERANGE;
+
+ rl = 20 - rl;
+
+ } else if (val[0] == '-') {
+
+ /* Prefixed with "-": Parse as negative user-friendly nice value */
+ r = safe_atou64(val + 1, &rl);
+ if (r < 0)
+ return r;
+
+ if (rl > (uint64_t) (-PRIO_MIN))
+ return -ERANGE;
+
+ rl = 20 + rl;
+ } else {
+
+ /* Not prefixed: parse as raw resource limit value */
+ r = safe_atou64(val, &rl);
+ if (r < 0)
+ return r;
+
+ if (rl > (uint64_t) (20 - PRIO_MIN))
+ return -ERANGE;
+ }
+
+ *ret = (rlim_t) rl;
+ return 0;
+}
+
+static int (*const rlimit_parse_table[_RLIMIT_MAX])(const char *val, rlim_t *ret) = {
+ [RLIMIT_CPU] = rlimit_parse_sec,
+ [RLIMIT_FSIZE] = rlimit_parse_size,
+ [RLIMIT_DATA] = rlimit_parse_size,
+ [RLIMIT_STACK] = rlimit_parse_size,
+ [RLIMIT_CORE] = rlimit_parse_size,
+ [RLIMIT_RSS] = rlimit_parse_size,
+ [RLIMIT_NOFILE] = rlimit_parse_u64,
+ [RLIMIT_AS] = rlimit_parse_size,
+ [RLIMIT_NPROC] = rlimit_parse_u64,
+ [RLIMIT_MEMLOCK] = rlimit_parse_size,
+ [RLIMIT_LOCKS] = rlimit_parse_u64,
+ [RLIMIT_SIGPENDING] = rlimit_parse_u64,
+ [RLIMIT_MSGQUEUE] = rlimit_parse_size,
+ [RLIMIT_NICE] = rlimit_parse_nice,
+ [RLIMIT_RTPRIO] = rlimit_parse_u64,
+ [RLIMIT_RTTIME] = rlimit_parse_usec,
+};
+
+int rlimit_parse_one(int resource, const char *val, rlim_t *ret) {
+ assert(val);
+ assert(ret);
+
+ if (resource < 0)
+ return -EINVAL;
+ if (resource >= _RLIMIT_MAX)
+ return -EINVAL;
+
+ return rlimit_parse_table[resource](val, ret);
+}
+
+int rlimit_parse(int resource, const char *val, struct rlimit *ret) {
+ _cleanup_free_ char *hard = NULL, *soft = NULL;
+ rlim_t hl, sl;
+ int r;
+
+ assert(val);
+ assert(ret);
+
+ r = extract_first_word(&val, &soft, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ return -EINVAL;
+
+ r = rlimit_parse_one(resource, soft, &sl);
+ if (r < 0)
+ return r;
+
+ r = extract_first_word(&val, &hard, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
+ if (r < 0)
+ return r;
+ if (!isempty(val))
+ return -EINVAL;
+ if (r == 0)
+ hl = sl;
+ else {
+ r = rlimit_parse_one(resource, hard, &hl);
+ if (r < 0)
+ return r;
+ if (sl > hl)
+ return -EILSEQ;
+ }
+
+ *ret = (struct rlimit) {
+ .rlim_cur = sl,
+ .rlim_max = hl,
+ };
+
+ return 0;
+}
+
+int rlimit_format(const struct rlimit *rl, char **ret) {
+ char *s = NULL;
+
+ assert(rl);
+ assert(ret);
+
+ if (rl->rlim_cur >= RLIM_INFINITY && rl->rlim_max >= RLIM_INFINITY)
+ s = strdup("infinity");
+ else if (rl->rlim_cur >= RLIM_INFINITY)
+ (void) asprintf(&s, "infinity:" RLIM_FMT, rl->rlim_max);
+ else if (rl->rlim_max >= RLIM_INFINITY)
+ (void) asprintf(&s, RLIM_FMT ":infinity", rl->rlim_cur);
+ else if (rl->rlim_cur == rl->rlim_max)
+ (void) asprintf(&s, RLIM_FMT, rl->rlim_cur);
+ else
+ (void) asprintf(&s, RLIM_FMT ":" RLIM_FMT, rl->rlim_cur, rl->rlim_max);
+
+ if (!s)
+ return -ENOMEM;
+
+ *ret = s;
+ return 0;
+}
+
+static const char* const rlimit_table[_RLIMIT_MAX] = {
+ [RLIMIT_CPU] = "LimitCPU",
+ [RLIMIT_FSIZE] = "LimitFSIZE",
+ [RLIMIT_DATA] = "LimitDATA",
+ [RLIMIT_STACK] = "LimitSTACK",
+ [RLIMIT_CORE] = "LimitCORE",
+ [RLIMIT_RSS] = "LimitRSS",
+ [RLIMIT_NOFILE] = "LimitNOFILE",
+ [RLIMIT_AS] = "LimitAS",
+ [RLIMIT_NPROC] = "LimitNPROC",
+ [RLIMIT_MEMLOCK] = "LimitMEMLOCK",
+ [RLIMIT_LOCKS] = "LimitLOCKS",
+ [RLIMIT_SIGPENDING] = "LimitSIGPENDING",
+ [RLIMIT_MSGQUEUE] = "LimitMSGQUEUE",
+ [RLIMIT_NICE] = "LimitNICE",
+ [RLIMIT_RTPRIO] = "LimitRTPRIO",
+ [RLIMIT_RTTIME] = "LimitRTTIME"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(rlimit, int);
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