util-lib: unify parsing of nice level values

This adds parse_nice() that parses a nice level and ensures it is in the right
range, via a new nice_is_valid() helper. It then ports over a number of users
to this.

No functional changes.

8 files changed, 78 insertions, 30 deletions

diff --git a/src/basic/parse-util.c b/src/basic/parse-util.c
index 11849ade0b..c98815b9bc 100644
--- a/src/basic/parse-util.c
+++ b/src/basic/parse-util.c
@@ -29,6 +29,7 @@
 #include "extract-word.h"
 #include "macro.h"
 #include "parse-util.h"
+#include "process-util.h"
 #include "string-util.h"
 
 int parse_boolean(const char *v) {
@@ -551,10 +552,25 @@ int parse_percent_unbounded(const char *p) {
 }
 
 int parse_percent(const char *p) {
-        int v = parse_percent_unbounded(p);
+        int v;
 
+        v = parse_percent_unbounded(p);
         if (v > 100)
                 return -ERANGE;
 
         return v;
 }
+
+int parse_nice(const char *p, int *ret) {
+        int n, r;
+
+        r = safe_atoi(p, &n);
+        if (r < 0)
+                return r;
+
+        if (!nice_is_valid(n))
+                return -ERANGE;
+
+        *ret = n;
+        return 0;
+}
diff --git a/src/basic/parse-util.h b/src/basic/parse-util.h
index f0fa5f9752..461e1cd4d8 100644
--- a/src/basic/parse-util.h
+++ b/src/basic/parse-util.h
@@ -108,3 +108,5 @@ int parse_fractional_part_u(const char **s, size_t digits, unsigned *res);
 
 int parse_percent_unbounded(const char *p);
 int parse_percent(const char *p);
+
+int parse_nice(const char *p, int *ret);
diff --git a/src/basic/process-util.h b/src/basic/process-util.h
index 9f75088796..2568e3834f 100644
--- a/src/basic/process-util.h
+++ b/src/basic/process-util.h
@@ -26,6 +26,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <sys/types.h>
+#include <sys/resource.h>
 
 #include "formats-util.h"
 #include "macro.h"
@@ -103,3 +104,7 @@ int sched_policy_from_string(const char *s);
 void valgrind_summary_hack(void);
 
 int pid_compare_func(const void *a, const void *b);
+
+static inline bool nice_is_valid(int n) {
+        return n >= PRIO_MIN && n < PRIO_MAX;
+}
diff --git a/src/core/dbus-execute.c b/src/core/dbus-execute.c
index 9c50cd93e5..346c8b973e 100644
--- a/src/core/dbus-execute.c
+++ b/src/core/dbus-execute.c
@@ -935,7 +935,7 @@ int bus_exec_context_set_transient_property(
                 if (r < 0)
                         return r;
 
-                if (n < PRIO_MIN || n >= PRIO_MAX)
+                if (!nice_is_valid(n))
                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Nice value out of range");
 
                 if (mode != UNIT_CHECK) {
diff --git a/src/core/load-fragment.c b/src/core/load-fragment.c
index d5f035b67f..420f368689 100644
--- a/src/core/load-fragment.c
+++ b/src/core/load-fragment.c
@@ -491,16 +491,17 @@ int config_parse_socket_bind(const char *unit,
         return 0;
 }
 
-int config_parse_exec_nice(const char *unit,
-                           const char *filename,
-                           unsigned line,
-                           const char *section,
-                           unsigned section_line,
-                           const char *lvalue,
-                           int ltype,
-                           const char *rvalue,
-                           void *data,
-                           void *userdata) {
+int config_parse_exec_nice(
+                const char *unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
 
         ExecContext *c = data;
         int priority, r;
@@ -510,14 +511,13 @@ int config_parse_exec_nice(const char *unit,
         assert(rvalue);
         assert(data);
 
-        r = safe_atoi(rvalue, &priority);
+        r = parse_nice(rvalue, &priority);
         if (r < 0) {
-                log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse nice priority, ignoring: %s", rvalue);
-                return 0;
-        }
+                if (r == -ERANGE)
+                        log_syntax(unit, LOG_ERR, filename, line, r, "Nice priority out of range, ignoring: %s", rvalue);
+                else
+                        log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse nice priority, ignoring: %s", rvalue);
 
-        if (priority < PRIO_MIN || priority >= PRIO_MAX) {
-                log_syntax(unit, LOG_ERR, filename, line, 0, "Nice priority out of range, ignoring: %s", rvalue);
                 return 0;
         }
 
diff --git a/src/run/run.c b/src/run/run.c
index 58fa49a4d1..1917ffd857 100644
--- a/src/run/run.c
+++ b/src/run/run.c
@@ -257,11 +257,9 @@ static int parse_argv(int argc, char *argv[]) {
                         break;
 
                 case ARG_NICE:
-                        r = safe_atoi(optarg, &arg_nice);
-                        if (r < 0 || arg_nice < PRIO_MIN || arg_nice >= PRIO_MAX) {
-                                log_error("Failed to parse nice value");
-                                return -EINVAL;
-                        }
+                        r = parse_nice(optarg, &arg_nice);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to parse nice value: %s", optarg);
 
                         arg_nice_set = true;
                         break;
diff --git a/src/shared/bus-unit-util.c b/src/shared/bus-unit-util.c
index 589f9d46e9..c3a5233532 100644
--- a/src/shared/bus-unit-util.c
+++ b/src/shared/bus-unit-util.c
@@ -366,15 +366,13 @@ int bus_append_unit_property_assignment(sd_bus_message *m, const char *assignmen
                 }
 
         } else if (streq(field, "Nice")) {
-                int32_t i;
+                int n;
 
-                r = safe_atoi32(eq, &i);
-                if (r < 0) {
-                        log_error("Failed to parse %s value %s.", field, eq);
-                        return -EINVAL;
-                }
+                r = parse_nice(eq, &n);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to parse nice value: %s", eq);
 
-                r = sd_bus_message_append(m, "v", "i", i);
+                r = sd_bus_message_append(m, "v", "i", (int32_t) n);
 
         } else if (STR_IN_SET(field, "Environment", "PassEnvironment")) {
                 const char *p;
diff --git a/src/test/test-parse-util.c b/src/test/test-parse-util.c
index 097c464229..d08014100b 100644
--- a/src/test/test-parse-util.c
+++ b/src/test/test-parse-util.c
@@ -498,6 +498,34 @@ static void test_parse_percent_unbounded(void) {
         assert_se(parse_percent_unbounded("400%") == 400);
 }
 
+static void test_parse_nice(void) {
+        int n;
+
+        assert_se(parse_nice("0", &n) >= 0 && n == 0);
+        assert_se(parse_nice("+0", &n) >= 0 && n == 0);
+        assert_se(parse_nice("-1", &n) >= 0 && n == -1);
+        assert_se(parse_nice("-2", &n) >= 0 && n == -2);
+        assert_se(parse_nice("1", &n) >= 0 && n == 1);
+        assert_se(parse_nice("2", &n) >= 0 && n == 2);
+        assert_se(parse_nice("+1", &n) >= 0 && n == 1);
+        assert_se(parse_nice("+2", &n) >= 0 && n == 2);
+        assert_se(parse_nice("-20", &n) >= 0 && n == -20);
+        assert_se(parse_nice("19", &n) >= 0 && n == 19);
+        assert_se(parse_nice("+19", &n) >= 0 && n == 19);
+
+
+        assert_se(parse_nice("", &n) == -EINVAL);
+        assert_se(parse_nice("-", &n) == -EINVAL);
+        assert_se(parse_nice("+", &n) == -EINVAL);
+        assert_se(parse_nice("xx", &n) == -EINVAL);
+        assert_se(parse_nice("-50", &n) == -ERANGE);
+        assert_se(parse_nice("50", &n) == -ERANGE);
+        assert_se(parse_nice("+50", &n) == -ERANGE);
+        assert_se(parse_nice("-21", &n) == -ERANGE);
+        assert_se(parse_nice("20", &n) == -ERANGE);
+        assert_se(parse_nice("+20", &n) == -ERANGE);
+}
+
 int main(int argc, char *argv[]) {
         log_parse_environment();
         log_open();
@@ -513,6 +541,7 @@ int main(int argc, char *argv[]) {
         test_safe_atod();
         test_parse_percent();
         test_parse_percent_unbounded();
+        test_parse_nice();
 
         return 0;
 }