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#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "../libnetdata.h"
static int clean_kprobe_event(FILE *out, char *filename, char *father_pid, netdata_ebpf_events_t *ptr) {
int fd = open(filename, O_WRONLY | O_APPEND, 0);
if (fd < 0) {
if(out) {
fprintf(out, "Cannot open %s : %s\n", filename, strerror(errno));
}
return 1;
}
char cmd[1024];
int length = sprintf(cmd, "-:kprobes/%c_netdata_%s_%s", ptr->type, ptr->name, father_pid);
int ret = 0;
if (length > 0) {
ssize_t written = write(fd, cmd, strlen(cmd));
if (written < 0) {
if(out) {
fprintf(out
, "Cannot remove the event (%d, %d) '%s' from %s : %s\n"
, getppid(), getpid(), cmd, filename, strerror((int)errno));
}
ret = 1;
}
}
close(fd);
return ret;
}
int clean_kprobe_events(FILE *out, int pid, netdata_ebpf_events_t *ptr) {
debug(D_EXIT, "Cleaning parent process events.");
char filename[FILENAME_MAX +1];
snprintf(filename, FILENAME_MAX, "%s%s", NETDATA_DEBUGFS, "kprobe_events");
char removeme[16];
snprintf(removeme, 15,"%d", pid);
int i;
for (i = 0 ; ptr[i].name ; i++) {
if (clean_kprobe_event(out, filename, removeme, &ptr[i])) {
break;
}
}
return 0;
}
//----------------------------------------------------------------------------------------------------------------------
int get_kernel_version(char *out, int size) {
char major[16], minor[16], patch[16];
char ver[256];
char *version = ver;
out[0] = '\0';
int fd = open("/proc/sys/kernel/osrelease", O_RDONLY);
if (fd < 0)
return -1;
ssize_t len = read(fd, ver, sizeof(ver));
if (len < 0) {
close(fd);
return -1;
}
close(fd);
char *move = major;
while (*version && *version != '.') *move++ = *version++;
*move = '\0';
version++;
move = minor;
while (*version && *version != '.') *move++ = *version++;
*move = '\0';
if (*version)
version++;
else
return -1;
move = patch;
while (*version) *move++ = *version++;
*move = '\0';
fd = snprintf(out, (size_t)size, "%s.%s.%s", major, minor, patch);
if (fd > size)
error("[EBPF]: The buffer to store kernel version is not smaller than necessary.");
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) {
//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) {
if(!has_ebpf_kernel_version(version))
return 0;
return 1;
}
//----------------------------------------------------------------------------------------------------------------------
char *ebpf_library_suffix(int version, int isrh) {
if (isrh) {
if (version >= NETDATA_EBPF_KERNEL_4_11)
return "4.18.0";
else
return "3.10.0";
} else {
if (version >= NETDATA_EBPF_KERNEL_4_17)
return "5.4.20";
else if (version >= NETDATA_EBPF_KERNEL_4_15)
return "4.16.18";
else if (version >= NETDATA_EBPF_KERNEL_4_11)
return "4.14.171";
}
return NULL;
}
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