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Processes: adds option countKprocs

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This commit is contained in:
Carter Li
2026-08-28 17:40:57 +08:00
committed by 李通洲
parent 41da49f579
commit 7fe08bddd0
15 changed files with 216 additions and 101 deletions
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src/detection/processes/processes_linux.c
+33 -20
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@@ -4,26 +4,23 @@
#include "common/memrchr.h"
#include "common/strutil.h"
const char* ffDetectProcesses(FFProcessesResult* result) {
#define PF_KTHREAD 0x00200000 // defined in kernel include/linux/sched.h
const char* ffDetectProcesses(const FFProcessesOptions* options, FFProcessesResult* result) {
FF_AUTO_CLOSE_DIR DIR* dir = opendir("/proc");
if (dir == nullptr) {
return "opendir(\"/proc\") failed";
}
uint32_t processes = 0;
uint32_t threads = 0;
int procfd = dirfd(dir);
struct dirent* entry;
while ((entry = readdir(dir)) != nullptr) {
if ((entry->d_type == DT_DIR || entry->d_type == DT_UNKNOWN) && ffCharIsDigit(entry->d_name[0])) {
++processes;
char statPath[32];
strcpy(ffStrCopy(statPath, entry->d_name, sizeof(statPath)), "/stat");
char statBuffer[256];
char statBuffer[512];
ssize_t statLength = ffReadFileDataRelative(procfd, statPath, sizeof(statBuffer) - 1, statBuffer);
if (statLength < 0) {
continue;
@@ -34,27 +31,43 @@ const char* ffDetectProcesses(FFProcessesResult* result) {
if (!cursor) {
continue;
}
++cursor;
cursor += 2; // skip ") "
if (__builtin_expect(cursor >= statBuffer + statLength, false)) {
goto skip_process;
}
for (uint32_t field = 2 /*comm*/; field < 20 /*num_threads*/; ++field) {
while (*cursor != ' ' && __builtin_expect(*cursor != '\0', true)) {
++cursor;
char* p;
for (uint32_t field = 3; field <= 20 /*num_threads*/; ++field) {
switch (field) {
case 9: // flags
if ((strtoul(cursor, &p, 10) & PF_KTHREAD) && !options->countKprocs) {
goto skip_process;
}
cursor = p;
break;
case 20: // num_threads
result->threads += (uint32_t) strtoul(cursor, &p, 10);
cursor = p;
break;
default:
while (*cursor != ' ' && __builtin_expect(*cursor != '\0', true)) {
++cursor;
}
break;
}
++cursor;
if (__builtin_expect(*cursor == '\0', false)) {
break;
if (__builtin_expect(cursor >= statBuffer + statLength, false)) {
goto skip_process;
}
}
if (__builtin_expect(*cursor == '\0', false)) {
continue;
}
threads += (uint32_t) strtoul(cursor, nullptr, 10);
++result->processes;
}
skip_process:;
}
result->processes = processes;
result->threads = threads;
return nullptr;
}