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pollux.c
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pollux.c
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#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <openssl/conf.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/resource.h>
#include <sys/ioctl.h>
#include <time.h>
#include <unistd.h>
#define PROG_NAME "pollux"
#define PROG_BUILD "2.0.4"
#define error(m) fprintf(stderr, "%s: %s (%s)\n", __func__, (m), strerror(errno))
#define MAXLINE 1024
#define BLK_SIZE 8192
#define TMP_FILE "/tmp/.dup_files.txt"
#define HASH_SIZE 64 // sha256 in string format
#define ARROW_COL "\e[38;5;13m"
#define BANNER_COL "\e[38;5;202m"
#define HIGHLIGHT_COL "\e[38;5;246m"
#define CRFLAGS O_RDWR|O_CREAT|O_TRUNC
#define CRMODE S_IRUSR|S_IWUSR
struct file
{
const char *path;
int fd;
};
struct file outfile = {0};
static char *hexdigits = "0123456789abcdef";
struct Node
{
int array;
char *name;
size_t size;
struct Node *l;
struct Node *r;
struct Node *s;
char hash[HASH_SIZE];
};
typedef struct Node Node;
/* option flags */
#define UF_IGNORE_HIDDEN 0x1
#define UF_NO_DELETE 0x2
#define UF_QUIET_MODE 0x4
#define UF_DEBUG_MODE 0x8
#define UF_TO_FILE 0x10
static uint16_t user_options;
#define flag_is_set(f) (user_options & (f))
#define clear_struct(s) memset((s), 0, sizeof((*s)))
#define __hot __attribute__((hot))
#define __cold __attribute__((cold))
#define __noret __attribute__((__noreturn__))
struct stat cur_file_stats;
Node *root = NULL;
int files_scanned = 0;
int dup_files = 0;
int tmp_fd = -1;
FILE *tmp_fp = NULL;
uint64_t used_bytes = 0;
uint64_t wasted_bytes = 0;
time_t start = 0, end = 0;
char *path = NULL;
//static char program_name[64];
struct rlimit rlims;
char **user_blacklist = NULL;
static int istty = 1;
//static int close_start = 3;
const char *illegal_terms[] =
{
"/sys",
"/usr",
"/bin",
"/sbin",
"/kernel",
"/proc",
"/dev",
"/etc/",
"/lib",
"/run",
"/tmp",
"/boot",
"/var",
"/opt",
"/firmware",
"/Program Files/", /* surely I'll port Pollux to Windows one day ... */
"/ProgramData/",
".dll",
".so",
".bin",
(char *)NULL
};
char *line_buf = NULL;
unsigned char *hash_buf = NULL;
char *hash_hex = NULL;
char *block = NULL;
struct winsize winsz;
int max_col = 0;
static int insert_file(Node **, char *, size_t, FILE *) __hot __nonnull((1,2,4)) __wur;
static void free_tree(Node **) __nonnull((1));
static int scan_dirs(char *) __nonnull((1)) __wur;
static int print_and_decide(char *, char *, char *, FILE *) __nonnull((1,2,3,4)) __wur;
static int remove_which(char *, char *) __nonnull((1,2)) __wur;
static unsigned char *get_sha256_file(char *) __nonnull((1)) __wur;
//static void close_excess_fds(int);
static void strip_crnl(char *) __nonnull((1));
static inline char *hexlify(unsigned char *, size_t) __nonnull((1)) __wur;
static void display_usage(const int) __noret;
static int check_file(const char *) __nonnull((1)) __wur;
static inline int contains_illegal(const char *) __nonnull((1)) __wur;
static inline int contains_blacklisted(const char *) __nonnull((1)) __wur;
static void log_err(char *, ...) __nonnull((1));
static void debug(char *, ...) __nonnull((1));
static void signal_handler(int) __cold __noret;
static void pollux_init(void) __attribute__((constructor));
static void pollux_fini(void) __attribute__((destructor));
static int get_options(int, char *[]) __nonnull((2)) __wur;
static void print_stats(void);
static int divert_streams(int) __wur;
static void print_pollux_logo(void);
int
main(int argc, char *argv[])
{
int r = 0;
if (argc < 2)
display_usage(EXIT_FAILURE);
else
if (get_options(argc, argv) < 0)
goto fail;
if (check_file(argv[1]))
goto fail;
/*
* Might be run by a daemon process (e.g., Cron), so test first before
* doing ioctl() for TIOCGWINSZ, otherwise it will fail. Getting terminal
* dimensions needs to be done here and not in the constructor function,
* because they are not known before main()
*/
if (isatty(STDOUT_FILENO))
{
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &winsz) < 0)
{
log_err("main: ioctl TIOCGWINSZ error");
goto fail;
}
max_col = winsz.ws_col - 6;
}
if (!flag_is_set(UF_NO_DELETE))
{
if ((tmp_fd = open(TMP_FILE, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR)) < 0)
{
log_err("main: open error");
goto fail;
}
if (!(tmp_fp = fdopen(tmp_fd, "r+")))
{
log_err("main: fdopen error");
goto fail;
}
if (setvbuf(tmp_fp, NULL, _IONBF, 0) < 0)
{
log_err("main: setvbuf error");
goto fail;
}
}
/*
* Do this in get_options() now.
*
if (flag_is_set(UF_QUIET_MODE))
{
int fd = -1;
if ((fd = open("/dev/null", O_RDWR)) < 0)
{
log_err("main: open error");
goto fail;
}
if (fd != STDOUT_FILENO)
dup2(fd, STDOUT_FILENO);
if (fd != STDERR_FILENO)
dup2(fd, STDERR_FILENO);
close(fd);
fd = -1;
}
*/
strncpy(path, argv[1], strlen(argv[1]));
path[strlen(argv[1])] = 0;
print_pollux_logo();
printf("Starting scan in %s%s\e[m\n\n", HIGHLIGHT_COL, argv[1]);
time(&start);
r = scan_dirs(path);
time(&end);
lseek(tmp_fd, 0, SEEK_SET);
if (!flag_is_set(UF_NO_DELETE))
{
lseek(tmp_fd, 0, SEEK_SET);
while (fgets(line_buf, MAXLINE, tmp_fp) != NULL)
{
strip_crnl(line_buf);
unlink(line_buf);
}
unlink(TMP_FILE);
}
// unlink(TMP_FILE);
debug("printing stats");
print_stats();
if (r < 0)
goto fail;
else
exit(EXIT_SUCCESS);
fail:
exit(EXIT_FAILURE);
}
int
scan_dirs(char *path)
{
size_t n = 0, n_sv = 0;
DIR *dp = NULL;
struct dirent *dinf = NULL;
#ifndef __APPLE__
long dir_position = 0;
#endif
//int i = 0;
int dfd = -1;
//int illegal = 0;
register int loop_cnt = 0;
n = strlen(path);
if (n != 0)
{
if (path[(n-1)] != 0x2f)
{
path[n++] = 0x2f;
path[n] = 0;
}
}
n_sv = n;
debug("scanning %s", path);
if ((dfd = open(path, O_RDONLY)) < 0)
{
if (errno == EACCES) return(0);
log_err("scan_dirs: failed to open %s (line %d)", path, __LINE__);
goto fail;
}
if (!(dp = fdopendir(dfd)))
{
log_err("scan_dirs: failed open %s from fd (line %d)", path, __LINE__);
goto fail;
}
loop_cnt = 0;
while ((dinf = readdir(dp)) != NULL)
{
++loop_cnt;
if (!strcmp(".", dinf->d_name)
|| !strcmp("..", dinf->d_name))
continue;
if (flag_is_set(UF_IGNORE_HIDDEN))
{
if (dinf->d_name[0] == 0x2e)
continue;
}
strncpy((path + n), dinf->d_name, strlen(dinf->d_name));
*(path + n + strlen(dinf->d_name)) = 0;
if (contains_illegal(path))
continue;
if (contains_blacklisted(path))
continue;
clear_struct(&cur_file_stats);
//memset(&cur_file_stats, 0, sizeof(cur_file_stats));
if (lstat(path, &cur_file_stats) < 0)
{
if (errno == EACCES)
continue;
log_err("scan_dirs: lstat error for %s (line %d)", path, __LINE__);
goto fail;
}
if (S_ISREG(cur_file_stats.st_mode))
{
++files_scanned;
used_bytes += cur_file_stats.st_size;
debug("adding file %s to tree", path);
if (insert_file(&root, path, cur_file_stats.st_size, tmp_fp) < 0)
return -1;
}
else if (S_ISDIR(cur_file_stats.st_mode))
{
#ifdef __APPLE__
/*
* on OS X, cannot save directory position with telldir()
* and then reopen the directory and seek to that position
* because the return from telldir() is rendered invalid
* on closing/reopening the directory.
*/
char *cur_file_name = NULL;
size_t sz;
sz = ((strlen(dinf->d_name) + 0x10) & ~(0xf));
if (!(cur_file_name = calloc(sz, 1)))
{
log_err("insert_file: failed to allocate memory for current file %s (line %d)",
dinf->d_name, __LINE__);
goto fail;
}
strncpy(cur_file_name, dinf->d_name, strlen(dinf->d_name));
cur_file_name[strlen(dinf->d_name)] = 0;
closedir(dp);
//close_excess_fds(rlims.rlim_cur);
if (scan_dirs(path) < 0)
goto fail;
path[n] = 0;
/* do not need to worry here about open() failing because we
* already previously opened PATH with no problems
*/
if (!(dp = fdopendir(open(path, O_RDONLY))))
{
log_err("insert_file: opendir error");
goto fail;
}
rewinddir(dp);
dinf = readdir(dp);
if (!dinf)
goto fini;
/*
* Just read until we reach the file we were previously
* at before closing and reopening the directory
* (successfully tested on OS X High Sierra)
*/
while (strcmp(dinf->d_name, cur_file_name) != 0 && dinf)
dinf = readdir(dp);
if (!dinf)
goto fini;
if (cur_file_name != NULL)
{
free(cur_file_name);
cur_file_name = NULL;
}
#else
dir_position = telldir(dp);
closedir(dp);
dp = NULL;
//close_excess_fds(rlims.rlim_cur);
debug("descending into %s", path);
if (scan_dirs(path) < 0)
goto fail;
path[n] = 0;
debug("reopening %s", path);
/* do not need to worry here about open() failing because we
* already previously opened PATH with no problems
*/
if (!(dp = fdopendir(open(path, O_RDONLY))))
{
log_err("scan_dirs: opendir error (line %d)", __LINE__);
goto fail;
}
seekdir(dp, dir_position);
#endif
}
else // !S_ISREG && !S_ISDIR
{
continue;
}
} // while ((dir_inf = readdir()) != NULL)
if (dp)
{
closedir(dp);
dp = NULL;
}
#ifdef __APPLE__
fini:
#endif
path[n_sv] = 0;
return 0;
fail:
path[n_sv] = 0;
return -1;
}
int
insert_file(Node **root, char *fname, size_t size, FILE *fp)
{
int i = 0;
unsigned char *cur_file_hash = NULL;
unsigned char *comp_file_hash = NULL;
char *h = NULL;
Node *nptr = NULL;
size_t l = 0, rl = 0;
l = strlen(fname);
rl = ((l + 0xf) & ~(0xf));
if (*root == NULL)
{
if (!((*root) = malloc(sizeof(Node))))
{
log_err("insert_file: malloc error");
goto fail;
}
memset(*root, 0, sizeof(Node));
if (!((*root)->name = calloc(rl, 1)))
{
log_err("insert_file: calloc error");
goto fail;
}
strncpy((*root)->name, fname, l);
(*root)->name[l] = 0;
(*root)->hash[0] = 0;
(*root)->size = size;
(*root)->l = NULL;
(*root)->r = NULL;
(*root)->s = NULL;
(*root)->array = 0;
return 0;
}
if (size < (*root)->size)
{
if (insert_file(&(*root)->l, fname, size, fp) < 0)
return -1;
}
else
if (size > (*root)->size)
{
if (insert_file(&(*root)->r, fname, size, fp) < 0)
return -1;
}
else // size == (*root)->size --- possible duplicate file
{
if (!(cur_file_hash = get_sha256_file(fname)))
{
if (errno == EACCES)
goto fini;
log_err("insert_file: get_sha256_file error");
goto fail;
}
/*
* HASH_SIZE is defined as the number of bytes in the
* hexlified version; so divide by two so hexlify()
* knows where to stop in its operation.
*/
if (!(h = hexlify(cur_file_hash, (HASH_SIZE >> 1))))
{
log_err("insert_file: hexlify error");
goto fail;
}
strncpy(hash_hex, h, HASH_SIZE);
if ((*root)->hash[0] == 0)
{
if (!(comp_file_hash = get_sha256_file((*root)->name)))
{
if (errno == EACCES)
goto fini;
log_err("insert_file: get_sha256_file_r error");
goto fail;
}
if (!(h = hexlify(comp_file_hash, (HASH_SIZE >> 1))))
{
log_err("insert_file: hexlify error");
goto fail;
}
strncpy((*root)->hash, h, HASH_SIZE);
}
if (!strncmp(hash_hex, (*root)->hash, HASH_SIZE)) // duplicate files
{
wasted_bytes += cur_file_stats.st_size;
++dup_files;
if (print_and_decide(hash_hex, fname, (*root)->name, fp) == -1)
{
log_err("insert_file: print_and_decide error");
goto fail;
}
goto fini;
}
else
{
/*
* Before, those nodes with the same size were joined using a linked list;
* but due to not great performance (presumably due to non-contiguous
* memory accesses while testing for a duplicate file in the linked list),
* using a single array of nodes, which will go as needed. This should ensure
* better spatial locality and thus better usage of the fast cache memories
*/
if ((*root)->array == 0)
{
if (!((*root)->s = calloc(1, sizeof(Node))))
{
log_err("insert_file: calloc error");
goto fail;
}
(*root)->array = 1;
if (!(((*root)->s[0]).name = calloc(rl, 1)))
{
log_err("insert_file: calloc error");
goto fail;
}
strncpy((*root)->s[0].name, fname, l);
((*root)->s[0]).name[l] = 0;
strncpy((*root)->s[0].hash, hash_hex, HASH_SIZE);
((*root)->s[0]).size = size;
((*root)->s[0]).array = 0;
((*root)->s[0]).l = NULL;
((*root)->s[0]).r = NULL;
((*root)->s[0]).s = NULL;
goto fini;
}
else
{
/* compare FNAME with two at a time each iteration */
for (i = 0; i < ((*root)->array - 1); i+=2)
{
if (!strncmp(hash_hex, ((*root)->s[i]).hash, HASH_SIZE))
{
wasted_bytes += cur_file_stats.st_size;
++dup_files;
if (print_and_decide(hash_hex, fname, (*root)->s[i].name, fp) == -1)
{
log_err("insert_file: print_and_decide error");
goto fail;
}
goto fini;
}
else if (!strncmp(hash_hex, ((*root)->s[i+1]).hash, HASH_SIZE))
{
wasted_bytes += cur_file_stats.st_size;
++dup_files;
if (print_and_decide(hash_hex, fname, (*root)->s[i+1].name, fp) == -1)
{
log_err("insert_file: print_and_decide error");
goto fail;
}
goto fini;
}
else
continue;
}
/*
* If array size was 1, for example, the above loop would not have
* run at all, so i would remain at zero, so we'll catch that
* one here
*/
if (i < (*root)->array)
{
if (!strncmp(hash_hex, ((*root)->s[i]).hash, HASH_SIZE))
{
wasted_bytes += cur_file_stats.st_size;
++dup_files;
if (print_and_decide(hash_hex, fname, (*root)->s[i].name, fp) == -1)
{
log_err("insert_file: print_and_decide error");
goto fail;
}
goto fini;
}
}
/*
* The hash did not match any in the array of file hashes,
* so realloc() the array and insert the filename and hash
* of the new file
*/
(*root)->array = ((*root)->array + 1);
if (!((*root)->s = realloc((*root)->s, (*root)->array * sizeof(Node))))
{
log_err("insert_file: realloc error");
goto fail;
}
nptr = &((*root)->s[((*root)->array - 1)]);
memset(nptr, 0, sizeof(Node));
nptr->array = 0;
nptr->l = NULL;
nptr->r = NULL;
nptr->s = NULL;
if (!(nptr->name = calloc(rl, 1)))
{
log_err("insert_file: malloc error");
goto fail;
}
strncpy(nptr->name, fname, l);
nptr->name[l] = 0;
strncpy(nptr->hash, hash_hex, HASH_SIZE);
nptr->size = size;
}
}
}
fini:
return 0;
fail:
return -1;
}
void
free_tree(Node **root)
{
int i = 0;
if (*root == NULL) return;
if ((*root)->l)
free_tree(&((*root)->l));
else
if ((*root)->r)
free_tree(&((*root)->r));
if ((*root)->array > 0)
{
for (i = 0; i < (*root)->array; ++i)
{
if (((*root)->s[i]).name != NULL)
{
free(((*root)->s[i]).name);
((*root)->s[i]).name = NULL;
}
}
(*root)->array = 0;
}
if ((*root)->name)
{
free((*root)->name);
(*root)->name = NULL;
}
free(*root);
*root = NULL;
return;
}
void
log_err(char *fmt, ...)
{
va_list args;
char *tmp = NULL;
tmp = calloc(MAXLINE, 1);
memset(tmp, 0, MAXLINE);
va_start(args, fmt);
vsprintf(tmp, fmt, args);
va_end(args);
fprintf(stderr, "%s (%s)\n", tmp, strerror(errno));
if (tmp)
{
free(tmp);
tmp = NULL;
}
return;
}
void
debug(char *fmt, ...)
{
va_list args;
char *tmp = NULL;
if (flag_is_set(UF_DEBUG_MODE))
{
tmp = calloc(MAXLINE, 1);
memset(tmp, 0, MAXLINE);
va_start(args, fmt);
vsprintf(tmp, fmt, args);
va_end(args);
fprintf(stderr, "[debug]: %s\n", tmp);
if (tmp)
{
free(tmp);
tmp = NULL;
}
}
return;
}
void
signal_handler(int signo)
{
int i = 0;
setvbuf(stdout, NULL, _IONBF, 0);
for (i = 0; i < 2; ++i)
printf("%c%c%c", 0x08, 0x20, 0x08);
setvbuf(stdout, NULL, _IOLBF, 0);
printf("\n>>> Pollux v1.0 <<<\n*** Caught %s ***\n",
(signo==SIGINT?"SIGINT":
signo==SIGQUIT?"SIGQUIT":"signal"));
time(&end);
print_stats();
free_tree(&root);
exit(EXIT_SUCCESS);
}
void
pollux_init(void)
{
used_bytes = 0;
wasted_bytes = 0;
files_scanned = 0;
dup_files = 0;
OPENSSL_config(NULL);
OpenSSL_add_all_digests();
memset(&rlims, 0, sizeof(rlims));
if (getrlimit(RLIMIT_NOFILE, &rlims) < 0)
{
log_err("pollux_init: getrlimit error");
goto fail;
}
signal(SIGINT, signal_handler);
signal(SIGQUIT, signal_handler);
if (!(path = calloc((MAXLINE*2), 1)))
{
log_err("pollux_init: calloc error (line %d)", __LINE__);
goto fail;
}
if (!(line_buf = calloc(MAXLINE, 1)))
{
log_err("pollux_init: calloc error (line %d)", __LINE__);
goto fail;
}
if (!(hash_buf = calloc(32, 1)))
{
log_err("pollux_init: calloc error (line %d)", __LINE__);
goto fail;
}
if (!(hash_hex = calloc((HASH_SIZE+16), 1)))
{
log_err("pollux_init: calloc error (line %d)", __LINE__);
goto fail;
}
if (!(block = calloc(BLK_SIZE+16, 1)))
{
log_err("pollux_init: calloc error (line %d)", __LINE__);
goto fail;
}
return;
fail:
exit(EXIT_FAILURE);
}
void
pollux_fini(void)
{
if (root)
free_tree(&root);
if (path)
{
free(path);
path = NULL;
}
if (line_buf)
{
free(line_buf);
line_buf = NULL;
}
if (hash_buf)
{
free(hash_buf);
hash_buf = NULL;
}
if (hash_hex)
{
free(hash_hex);
hash_hex = NULL;
}
if (block)
{
free(block);
block = NULL;
}
if (user_blacklist)
{
int i;
for (i = 0; user_blacklist[i] != NULL; ++i)
{
free(user_blacklist[i]);
user_blacklist[i] = NULL;
}
free(user_blacklist);
}
}
int
get_options(int argc, char *argv[])
{
int i = 0, j = 0;
int blist_idx = 0;
for(i = 0; i < argc; ++i)
{
while (i < argc
&& strncmp("-", argv[i], 1) != 0
&& strncmp("--", argv[i], 2) != 0)
++i;
if (i >= argc) break;
if (strcmp("--help", argv[i]) == 0
|| strcmp("-h", argv[i]) == 0)
{
display_usage(EXIT_SUCCESS);
}
else
if (strcmp("--blacklist", argv[i]) == 0
|| strcmp("-B", argv[i]) == 0)
{
if (!(user_blacklist = calloc(1, sizeof(char *))))
{ log_err("get_options: calloc error"); goto fail; }
user_blacklist[0] = NULL;
++i;
j = i;
blist_idx = 0;
while (j < argc
&& strncmp("-", argv[j], 1) != 0
&& strncmp("--", argv[j], 2) != 0)
{
if (!(user_blacklist[blist_idx] = calloc(64, 1)))
{ log_err("get_options: calloc error"); goto fail; }
strncpy(user_blacklist[blist_idx], argv[j], strlen(argv[j]));
user_blacklist[blist_idx][strlen(argv[j])] = 0;
++blist_idx;
++j;
if (!(user_blacklist = realloc(user_blacklist, ((blist_idx+1) * sizeof(char *)))))
{ log_err("get_options: realloc error"); goto fail; }
}
user_blacklist[blist_idx] = NULL;
i = (j-1);
}
else if (strcmp("--nodelete", argv[i]) == 0
|| strcmp("-N", argv[i]) == 0)
{
user_options |= UF_NO_DELETE;
}
else if (strcmp("--nohidden", argv[i]) == 0)
{