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tools.c
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tools.c
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#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/klog.h>
#include <unistd.h>
#include "mmap.h"
#include "tools.h"
#define MAX_ERROR_MSG 0x1000
int regex_compile(regex_t *r, const char *regex_text) {
int status = regcomp(r, regex_text, REG_EXTENDED | REG_NEWLINE);
if (status != 0) {
char error_message[MAX_ERROR_MSG];
regerror(status, r, error_message, MAX_ERROR_MSG);
printf("Regex error compiling '%s': %s\n", regex_text, error_message);
fflush(stdout);
return -1;
}
return 1;
}
// reads io register value
// call with addr == 0 to cleanup cached resources
bool mem_reg(uint32_t addr, uint32_t *data, enum REG_OPS op) {
static int mem_fd;
static char *loaded_area;
static uint32_t loaded_offset;
static uint32_t loaded_size;
uint32_t offset = addr & 0xffff0000;
uint32_t size = 0xffff;
if (!addr || (loaded_area && offset != loaded_offset)) {
int res = munmap(loaded_area, loaded_size);
if (res) {
fprintf(stderr, "read_mem_reg error: %s (%d)\n", strerror(errno),
errno);
}
}
if (!addr) {
close(mem_fd);
return true;
}
if (!mem_fd) {
mem_fd = open("/dev/mem", O_RDWR | O_SYNC);
if (mem_fd < 0) {
fprintf(stderr, "can't open /dev/mem\n");
return false;
}
}
volatile char *mapped_area;
if (offset != loaded_offset) {
mapped_area =
mmap(NULL, // Any adddress in our space will do
size, // Map length
PROT_READ |
PROT_WRITE, // Enable reading & writting to mapped memory
MAP_SHARED, // Shared with other processes
mem_fd, // File to map
offset // Offset to base address
);
if (mapped_area == MAP_FAILED) {
fprintf(stderr, "read_mem_reg mmap error: %s (%d)\n",
strerror(errno), errno);
return false;
}
loaded_area = (char *)mapped_area;
loaded_size = size;
loaded_offset = offset;
} else
mapped_area = loaded_area;
if (op == OP_READ)
*data = *(volatile uint32_t *)(mapped_area + (addr - offset));
else if (op == OP_WRITE)
*(volatile uint32_t *)(mapped_area + (addr - offset)) = *data;
return true;
}
void lsnprintf(char *buf, size_t n, char *fmt, ...) {
va_list argptr;
va_start(argptr, fmt);
vsnprintf(buf, n, fmt, argptr);
va_end(argptr);
char *ptr = buf;
while (*ptr) {
*ptr = tolower(*ptr);
ptr++;
}
}
#define SYSLOG_ACTION_READ_ALL 3
ssize_t get_dmesg_buf(char **buf) {
int len = klogctl(10, NULL, 0); /* read ring buffer size */
*buf = malloc(len);
if (!*buf)
return 0;
len = klogctl(SYSLOG_ACTION_READ_ALL, *buf, len);
return len;
}
int dmesg() {
char *dmesg;
ssize_t len = get_dmesg_buf(&dmesg);
if (dmesg) {
puts(dmesg);
free(dmesg);
}
return EXIT_SUCCESS;
}
bool dts_items_by_regex(const char *filename, const char *re, char *outbuf,
size_t outlen) {
long res = false;
FILE *f = fopen(filename, "r");
if (!f)
return false;
fseek(f, 0L, SEEK_END);
int fsize = ftell(f);
rewind(f);
char *text = malloc(fsize + 1);
fread(text, 1, fsize, f);
text[fsize] = 0;
for (int i = 0; i < fsize; i++) {
if (text[i] == 0)
text[i] = '\n';
}
regex_t regex;
regmatch_t matches[2];
if (!regex_compile(®ex, re))
goto exit;
if (regexec(®ex, text, ARRCNT(matches), matches, 0) == 0) {
regoff_t start = matches[1].rm_so;
regoff_t end = matches[1].rm_eo;
text[end] = 0;
strncpy(outbuf, text + start, outlen);
res = true;
}
exit:
free(text);
regfree(®ex);
fclose(f);
return res;
}
bool line_from_file(const char *filename, const char *re, char *outbuf,
size_t outlen) {
long res = false;
FILE *f = fopen(filename, "r");
if (!f)
return false;
regex_t regex;
regmatch_t matches[2];
if (!regex_compile(®ex, re))
goto exit;
char *line = NULL;
size_t len = 0;
while (getline(&line, &len, f) != -1) {
if (regexec(®ex, line, ARRCNT(matches), matches, 0) == 0) {
regoff_t start = matches[1].rm_so;
regoff_t end = matches[1].rm_eo;
line[end] = 0;
strncpy(outbuf, line + start, outlen);
res = true;
break;
}
}
if (line)
free(line);
exit:
regfree(®ex);
fclose(f);
return res;
}
uint32_t read_le32(const char *ptr) {
return *ptr | *(ptr + 1) << 8 | *(ptr + 2) << 16 | *(ptr + 3) << 24;
}
uint32_t ceil_up(uint32_t n, uint32_t offset) {
uint32_t d = n - n % offset;
if (n % offset)
d += offset;
return d;
}
char *fread_to_buf(const char *filename, size_t *bs, uint32_t round_up,
size_t *payloadsz) {
FILE *fp = fopen(filename, "rb");
if (!fp)
return NULL;
fseek(fp, 0, SEEK_END);
size_t len = ftell(fp);
fseek(fp, 0, SEEK_SET);
*bs = len;
if (round_up) {
*bs = ceil_up(*bs, round_up);
}
char *buf = malloc(*bs);
if (!buf)
return NULL;
len = fread(buf, 1, len, fp);
memset(buf + len, 0xff, *bs - len);
fclose(fp);
if (payloadsz)
*payloadsz = len;
return buf;
}
char *file_to_buf(const char *filename, size_t *len) {
return fread_to_buf(filename, len, 0, NULL);
}
static char printk_state[16];
#define PRINTK_FILE "/proc/sys/kernel/printk"
void disable_printk() {
if (*printk_state)
return;
FILE *fp = fopen(PRINTK_FILE, "rw+");
if (!fp)
return;
const char *ret;
ret = fgets(printk_state, sizeof(printk_state) - 1, fp);
// We cannot use rewind() here
fclose(fp);
if (!ret)
return;
fp = fopen(PRINTK_FILE, "w");
fprintf(fp, "0 0 0 0\n");
fclose(fp);
}
void restore_printk() {
if (!*printk_state)
return;
FILE *fp = fopen(PRINTK_FILE, "w");
fprintf(fp, "%s", printk_state);
fclose(fp);
}
static unsigned long time_by_proc(const char *filename, char *shortname,
size_t shortsz) {
FILE *fp = fopen(filename, "r");
if (!fp)
return 0;
char line[1024];
if (!fgets(line, sizeof(line), fp))
return 0;
char *rpar = strchr(line, ')');
if (!rpar || *(rpar + 1) != ' ')
return 0;
if (shortname) {
const char *lpar = strchr(line, '(');
*rpar = 0;
strncpy(shortname, lpar + 1, shortsz);
}
char state;
long long ppid, pgid, sid, tty_nr, tty_pgrp;
unsigned long flags, min_flt, cmin_flt, maj_flt, cmaj_flt, utime, stime;
long long cutime, cstime;
sscanf(rpar + 2,
"%c %lld %lld %lld %lld %lld %ld %ld %ld %ld %ld %ld %ld %lld %lld",
&state, &ppid, &pgid, &sid, &tty_nr, &tty_pgrp, &flags, &min_flt,
&cmin_flt, &maj_flt, &cmaj_flt, &utime, &stime, &cutime, &cstime);
fclose(fp);
return utime + stime;
}
pid_t get_god_pid(char *shortname, size_t shortsz) {
DIR *dir = opendir("/proc");
if (!dir)
return -1;
unsigned long max = 0;
char sname[1024], prname[255], maxname[255] = {0};
pid_t godpid = -1;
struct dirent *entry;
while ((entry = readdir(dir)) != NULL) {
if (*entry->d_name && isdigit(entry->d_name[0])) {
snprintf(sname, sizeof(sname), "/proc/%s/stat", entry->d_name);
unsigned long curres = time_by_proc(sname, prname, sizeof(prname));
if (curres > max) {
max = curres;
godpid = strtol(entry->d_name, NULL, 10);
strcpy(maxname, prname);
}
}
};
closedir(dir);
strncpy(shortname, maxname, shortsz);
return godpid;
}