core: support IEC suffixes for RLIMIT stuff

Let's make things more user-friendly and support for example

  LimitAS=16G

rather than force users to always use LimitAS=16106127360.

The change is relevant for options:

  [Default]Limit{FSIZE,DATA,STACK,CORE,RSS,AS,MEMLOCK,MSGQUEUE}

The patch introduces config_parse_bytes_limit(), it's the same as
config_parse_limit() but uses parse_size() tu support the suffixes.

Addresses: https://github.com/systemd/systemd/issues/1772

4 files changed, 60 insertions, 16 deletions

diff --git a/src/core/load-fragment-gperf.gperf.m4 b/src/core/load-fragment-gperf.gperf.m4
index c3b48aec4c..5b7954dbf9 100644
--- a/src/core/load-fragment-gperf.gperf.m4
+++ b/src/core/load-fragment-gperf.gperf.m4
@@ -59,18 +59,18 @@ $1.SystemCallArchitectures,      config_parse_warn_compat,           DISABLED_CO
 $1.SystemCallErrorNumber,        config_parse_warn_compat,           DISABLED_CONFIGURATION,        0
 $1.RestrictAddressFamilies,      config_parse_warn_compat,           DISABLED_CONFIGURATION,        0')
 $1.LimitCPU,                     config_parse_limit,                 RLIMIT_CPU,                    offsetof($1, exec_context.rlimit)
-$1.LimitFSIZE,                   config_parse_limit,                 RLIMIT_FSIZE,                  offsetof($1, exec_context.rlimit)
-$1.LimitDATA,                    config_parse_limit,                 RLIMIT_DATA,                   offsetof($1, exec_context.rlimit)
-$1.LimitSTACK,                   config_parse_limit,                 RLIMIT_STACK,                  offsetof($1, exec_context.rlimit)
-$1.LimitCORE,                    config_parse_limit,                 RLIMIT_CORE,                   offsetof($1, exec_context.rlimit)
-$1.LimitRSS,                     config_parse_limit,                 RLIMIT_RSS,                    offsetof($1, exec_context.rlimit)
+$1.LimitFSIZE,                   config_parse_bytes_limit,           RLIMIT_FSIZE,                  offsetof($1, exec_context.rlimit)
+$1.LimitDATA,                    config_parse_bytes_limit,           RLIMIT_DATA,                   offsetof($1, exec_context.rlimit)
+$1.LimitSTACK,                   config_parse_bytes_limit,           RLIMIT_STACK,                  offsetof($1, exec_context.rlimit)
+$1.LimitCORE,                    config_parse_bytes_limit,           RLIMIT_CORE,                   offsetof($1, exec_context.rlimit)
+$1.LimitRSS,                     config_parse_bytes_limit,           RLIMIT_RSS,                    offsetof($1, exec_context.rlimit)
 $1.LimitNOFILE,                  config_parse_limit,                 RLIMIT_NOFILE,                 offsetof($1, exec_context.rlimit)
-$1.LimitAS,                      config_parse_limit,                 RLIMIT_AS,                     offsetof($1, exec_context.rlimit)
+$1.LimitAS,                      config_parse_bytes_limit,           RLIMIT_AS,                     offsetof($1, exec_context.rlimit)
 $1.LimitNPROC,                   config_parse_limit,                 RLIMIT_NPROC,                  offsetof($1, exec_context.rlimit)
-$1.LimitMEMLOCK,                 config_parse_limit,                 RLIMIT_MEMLOCK,                offsetof($1, exec_context.rlimit)
+$1.LimitMEMLOCK,                 config_parse_bytes_limit,           RLIMIT_MEMLOCK,                offsetof($1, exec_context.rlimit)
 $1.LimitLOCKS,                   config_parse_limit,                 RLIMIT_LOCKS,                  offsetof($1, exec_context.rlimit)
 $1.LimitSIGPENDING,              config_parse_limit,                 RLIMIT_SIGPENDING,             offsetof($1, exec_context.rlimit)
-$1.LimitMSGQUEUE,                config_parse_limit,                 RLIMIT_MSGQUEUE,               offsetof($1, exec_context.rlimit)
+$1.LimitMSGQUEUE,                config_parse_bytes_limit,           RLIMIT_MSGQUEUE,               offsetof($1, exec_context.rlimit)
 $1.LimitNICE,                    config_parse_limit,                 RLIMIT_NICE,                   offsetof($1, exec_context.rlimit)
 $1.LimitRTPRIO,                  config_parse_limit,                 RLIMIT_RTPRIO,                 offsetof($1, exec_context.rlimit)
 $1.LimitRTTIME,                  config_parse_limit,                 RLIMIT_RTTIME,                 offsetof($1, exec_context.rlimit)
diff --git a/src/core/load-fragment.c b/src/core/load-fragment.c
index 43cdd1f4c4..b7d2ecd2f2 100644
--- a/src/core/load-fragment.c
+++ b/src/core/load-fragment.c
@@ -1082,6 +1082,49 @@ int config_parse_limit(const char *unit,
         return 0;
 }
 
+int config_parse_bytes_limit(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) {
+
+        struct rlimit **rl = data;
+        uint64_t bytes;
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+        assert(data);
+
+        rl += ltype;
+
+        if (streq(rvalue, "infinity"))
+                bytes = (uint64_t) RLIM_INFINITY;
+        else {
+                int r;
+
+                r = parse_size(rvalue, 1024, &bytes);
+                if (r < 0) {
+                        log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse resource value, ignoring: %s", rvalue);
+                        return 0;
+                }
+        }
+
+        if (!*rl) {
+                *rl = new(struct rlimit, 1);
+                if (!*rl)
+                        return log_oom();
+        }
+
+        (*rl)->rlim_cur = (*rl)->rlim_max = (rlim_t) bytes;
+        return 0;
+}
+
 #ifdef HAVE_SYSV_COMPAT
 int config_parse_sysv_priority(const char *unit,
                                const char *filename,
diff --git a/src/core/load-fragment.h b/src/core/load-fragment.h
index 8661cbfedc..029775bb46 100644
--- a/src/core/load-fragment.h
+++ b/src/core/load-fragment.h
@@ -56,6 +56,7 @@ int config_parse_exec_capabilities(const char *unit, const char *filename, unsig
 int config_parse_exec_secure_bits(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_bounding_set(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_limit(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_bytes_limit(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_sysv_priority(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_kill_signal(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_mount_flags(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);
diff --git a/src/core/main.c b/src/core/main.c
index 696372e37c..950315e857 100644
--- a/src/core/main.c
+++ b/src/core/main.c
@@ -658,18 +658,18 @@ static int parse_config_file(void) {
                 { "Manager", "DefaultStartLimitBurst",    config_parse_unsigned,         0, &arg_default_start_limit_burst         },
                 { "Manager", "DefaultEnvironment",        config_parse_environ,          0, &arg_default_environment               },
                 { "Manager", "DefaultLimitCPU",           config_parse_limit,            0, &arg_default_rlimit[RLIMIT_CPU]        },
-                { "Manager", "DefaultLimitFSIZE",         config_parse_limit,            0, &arg_default_rlimit[RLIMIT_FSIZE]      },
-                { "Manager", "DefaultLimitDATA",          config_parse_limit,            0, &arg_default_rlimit[RLIMIT_DATA]       },
-                { "Manager", "DefaultLimitSTACK",         config_parse_limit,            0, &arg_default_rlimit[RLIMIT_STACK]      },
-                { "Manager", "DefaultLimitCORE",          config_parse_limit,            0, &arg_default_rlimit[RLIMIT_CORE]       },
-                { "Manager", "DefaultLimitRSS",           config_parse_limit,            0, &arg_default_rlimit[RLIMIT_RSS]        },
+                { "Manager", "DefaultLimitFSIZE",         config_parse_bytes_limit,      0, &arg_default_rlimit[RLIMIT_FSIZE]      },
+                { "Manager", "DefaultLimitDATA",          config_parse_bytes_limit,      0, &arg_default_rlimit[RLIMIT_DATA]       },
+                { "Manager", "DefaultLimitSTACK",         config_parse_bytes_limit,      0, &arg_default_rlimit[RLIMIT_STACK]      },
+                { "Manager", "DefaultLimitCORE",          config_parse_bytes_limit,      0, &arg_default_rlimit[RLIMIT_CORE]       },
+                { "Manager", "DefaultLimitRSS",           config_parse_bytes_limit,      0, &arg_default_rlimit[RLIMIT_RSS]        },
                 { "Manager", "DefaultLimitNOFILE",        config_parse_limit,            0, &arg_default_rlimit[RLIMIT_NOFILE]     },
-                { "Manager", "DefaultLimitAS",            config_parse_limit,            0, &arg_default_rlimit[RLIMIT_AS]         },
+                { "Manager", "DefaultLimitAS",            config_parse_bytes_limit,      0, &arg_default_rlimit[RLIMIT_AS]         },
                 { "Manager", "DefaultLimitNPROC",         config_parse_limit,            0, &arg_default_rlimit[RLIMIT_NPROC]      },
-                { "Manager", "DefaultLimitMEMLOCK",       config_parse_limit,            0, &arg_default_rlimit[RLIMIT_MEMLOCK]    },
+                { "Manager", "DefaultLimitMEMLOCK",       config_parse_bytes_limit,      0, &arg_default_rlimit[RLIMIT_MEMLOCK]    },
                 { "Manager", "DefaultLimitLOCKS",         config_parse_limit,            0, &arg_default_rlimit[RLIMIT_LOCKS]      },
                 { "Manager", "DefaultLimitSIGPENDING",    config_parse_limit,            0, &arg_default_rlimit[RLIMIT_SIGPENDING] },
-                { "Manager", "DefaultLimitMSGQUEUE",      config_parse_limit,            0, &arg_default_rlimit[RLIMIT_MSGQUEUE]   },
+                { "Manager", "DefaultLimitMSGQUEUE",      config_parse_bytes_limit,      0, &arg_default_rlimit[RLIMIT_MSGQUEUE]   },
                 { "Manager", "DefaultLimitNICE",          config_parse_limit,            0, &arg_default_rlimit[RLIMIT_NICE]       },
                 { "Manager", "DefaultLimitRTPRIO",        config_parse_limit,            0, &arg_default_rlimit[RLIMIT_RTPRIO]     },
                 { "Manager", "DefaultLimitRTTIME",        config_parse_limit,            0, &arg_default_rlimit[RLIMIT_RTTIME]     },