Fixes compatibility with RH 7.x family (#8694)

Brings eBPF collector to RH 7.x family.

2 files changed, 68 insertions, 1 deletions

diff --git a/libnetdata/ebpf/ebpf.c b/libnetdata/ebpf/ebpf.c
index 6c49706893..ea1fc37e1b 100644
--- a/libnetdata/ebpf/ebpf.c
+++ b/libnetdata/ebpf/ebpf.c
@@ -91,8 +91,50 @@ int get_kernel_version() {
     return ((int)(str2l(major)*65536) + (int)(str2l(minor)*256) + (int)str2l(patch));
 }
 
+int get_redhat_release()
+{
+    char buffer[256];
+    int major,minor;
+    FILE *fp = fopen("/etc/redhat-release", "r");
+
+    if (fp) {
+        major = 0;
+        minor = -1;
+        size_t length = fread(buffer, sizeof(char), 255, fp);
+        if (length > 4 ) {
+            buffer[length] = '\0';
+            char *end = strchr(buffer, '.');
+            char *start;
+            if (end) {
+                *end = 0x0;
+
+                if (end > buffer) {
+                    start = end - 1;
+
+                    major = strtol( start, NULL, 10);
+                    start = ++end;
+
+                    end++;
+                    if(end) {
+                        end = 0x00;
+                        minor = strtol( start, NULL, 10);
+                    } else {
+                        minor = -1;
+                    }
+                }
+            }
+        }
+
+        fclose(fp);
+        return ((major*256) + minor);
+    } else {
+        return -1;
+    }
+}
+
 static int has_ebpf_kernel_version(int version) {
-    return (version >= 264960);
+            //Kernel 4.11.0 or RH > 7.5
+    return (version >= NETDATA_MINIMUM_EBPF_KERNEL ||  get_redhat_release() >= NETDATA_MINIMUM_RH_VERSION);
 }
 
 int has_condition_to_run(int version) {
diff --git a/libnetdata/ebpf/ebpf.h b/libnetdata/ebpf/ebpf.h
index 382f549e7b..e7cd651a67 100644
--- a/libnetdata/ebpf/ebpf.h
+++ b/libnetdata/ebpf/ebpf.h
@@ -3,6 +3,30 @@
 
 # define NETDATA_DEBUGFS "/sys/kernel/debug/tracing/"
 
+/**
+ * The next magic number is got doing the following math:
+ *  294960 = 4*65536 + 11*256 + 0
+ *
+ *  For more details, please, read /usr/include/linux/version.h
+ */
+# define NETDATA_MINIMUM_EBPF_KERNEL 264960
+
+/**
+ * The RedHat magic number was got doing:
+ *
+ * 1797 = 7*256 + 5
+ *
+ *  For more details, please, read /usr/include/linux/version.h
+ *  in any Red Hat installation.
+ */
+# define NETDATA_MINIMUM_RH_VERSION 1797
+
+/**
+ * 2048 = 8*256 + 0
+ */
+# define NETDATA_RH_8 2048
+
+
 typedef struct netdata_ebpf_events {
     char type;
     char *name;
@@ -11,6 +35,7 @@ typedef struct netdata_ebpf_events {
 
 extern int clean_kprobe_events(FILE *out, int pid, netdata_ebpf_events_t *ptr);
 extern int get_kernel_version();
+extern int get_redhat_release();
 extern int has_condition_to_run(int version);
 
 #endif