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parse /proc/sys/kernel/random (#305)
Signed-off-by: binjip978 <[email protected]>
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Sergei Semenchuk
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Jun 6, 2020
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| // Copyright 2020 The Prometheus Authors | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| // +build !windows | ||
|
|
||
| package procfs | ||
|
|
||
| import ( | ||
| "os" | ||
|
|
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| "github.com/prometheus/procfs/internal/util" | ||
| ) | ||
|
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| // KernelRandom contains information about to the kernel's random number generator. | ||
| type KernelRandom struct { | ||
| // EntropyAvaliable gives the available entropy, in bits. | ||
| EntropyAvaliable *uint64 | ||
| // PoolSize gives the size of the entropy pool, in bytes. | ||
| PoolSize *uint64 | ||
| // URandomMinReseedSeconds is the number of seconds after which the DRNG will be reseeded. | ||
| URandomMinReseedSeconds *uint64 | ||
| // WriteWakeupThreshold the number of bits of entropy below which we wake up processes | ||
| // that do a select(2) or poll(2) for write access to /dev/random. | ||
| WriteWakeupThreshold *uint64 | ||
| // ReadWakeupThreshold is the number of bits of entropy required for waking up processes that sleep | ||
| // waiting for entropy from /dev/random. | ||
| ReadWakeupThreshold *uint64 | ||
| } | ||
|
|
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| // KernelRandom returns values from /proc/sys/kernel/random. | ||
| func (fs FS) KernelRandom() (KernelRandom, error) { | ||
| random := KernelRandom{} | ||
|
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||
| for file, p := range map[string]**uint64{ | ||
| "entropy_avail": &random.EntropyAvaliable, | ||
| "poolsize": &random.PoolSize, | ||
| "urandom_min_reseed_secs": &random.URandomMinReseedSeconds, | ||
| "write_wakeup_threshold": &random.WriteWakeupThreshold, | ||
| "read_wakeup_threshold": &random.ReadWakeupThreshold, | ||
| } { | ||
| val, err := util.ReadUintFromFile(fs.proc.Path("sys", "kernel", "random", file)) | ||
| if os.IsNotExist(err) { | ||
| continue | ||
| } | ||
| if err != nil { | ||
| return random, err | ||
| } | ||
| *p = &val | ||
| } | ||
|
|
||
| return random, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| // Copyright 2020 The Prometheus Authors | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| // +build !windows | ||
|
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| package procfs | ||
|
|
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| import ( | ||
| "testing" | ||
| ) | ||
|
|
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| const procfsFixtures = "fixtures/proc" | ||
|
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| func TestKernelRandom(t *testing.T) { | ||
| fs, err := NewFS(procfsFixtures) | ||
| if err != nil { | ||
| t.Fatalf("failed to access %s: %v", procfsFixtures, err) | ||
| } | ||
|
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| random, err := fs.KernelRandom() | ||
| if err != nil { | ||
| t.Fatalf("failed to collect %s/sys/kernel/random: %v", procfsFixtures, err) | ||
| } | ||
|
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| if *random.EntropyAvaliable != 3943 { | ||
| t.Errorf("entropy_avail, want %d got %d", 3943, *random.EntropyAvaliable) | ||
| } | ||
| if *random.PoolSize != 4096 { | ||
| t.Errorf("poolsize, want %d got %d", 4096, *random.PoolSize) | ||
| } | ||
| if *random.URandomMinReseedSeconds != 60 { | ||
| t.Errorf("urandom_min_reseed_secs, want %d got %d", 60, *random.URandomMinReseedSeconds) | ||
| } | ||
| if *random.WriteWakeupThreshold != 3072 { | ||
| t.Errorf("write_wakeup_threshold, want %d got %d", 3072, *random.WriteWakeupThreshold) | ||
| } | ||
| if random.ReadWakeupThreshold != nil { | ||
| t.Errorf("read_wakeup_threshold, want %v got %d", nil, *random.ReadWakeupThreshold) | ||
| } | ||
| } |