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using qsort for 4 ints is overkill

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replace it with custom mini sort routine.
This commit is contained in:
rofl0r
2022-04-12 23:51:17 +00:00
parent 0000000062
commit 0a4daa62d6
1 changed files with 12 additions and 7 deletions
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19
src/libproxychains.c
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@@ -601,11 +601,17 @@ static int is_v4inv6(const struct in6_addr *a) {
return !memcmp(a->s6_addr, "\0\0\0\0\0\0\0\0\0\0\xff\xff", 12);
}
static int compare_func_int(const void *l, const void *r) {
int arg1 = *(const int*)l;
int arg2 = *(const int*)r;
return (arg1 > arg2) - (arg1 < arg2);
static void intsort(int *a, int n) {
int i, j, s;
for(i=0; i<n; ++i)
for(j=i+1; j<n; ++j)
if(a[j] < a[i]) {
s = a[i];
a[i] = a[j];
a[j] = s;
}
}
/* Warning: Linux manual says the third arg is `unsigned int`, but unistd.h says `int`. */
HOOKFUNC(int, close_range, unsigned first, unsigned last, int flags) {
if(true_close_range == NULL) {
@@ -629,15 +635,14 @@ HOOKFUNC(int, close_range, unsigned first, unsigned last, int flags) {
/* prevent rude programs (like ssh) from closing our pipes */
int res = 0, uerrno = 0, i;
int protected_fds[] = {req_pipefd[0], req_pipefd[1], resp_pipefd[0], resp_pipefd[1]};
int protected_fds_size = sizeof protected_fds / sizeof protected_fds[0];
qsort(protected_fds, protected_fds_size, sizeof protected_fds[0], compare_func_int);
intsort(protected_fds, 4);
/* We are skipping protected_fds while calling true_close_range()
* If protected_fds cut the range into some sub-ranges, we close sub-ranges BEFORE cut point in the loop.
* [first, cut1-1] , [cut1+1, cut2-1] , [cut2+1, cut3-1]
* Finally, we delete the remaining sub-range, outside the loop. [cut3+1, tail]
*/
int next_fd_to_close = first;
for(i = 0; i < protected_fds_size; ++i) {
for(i = 0; i < 4; ++i) {
if(protected_fds[i] < first || protected_fds[i] > last)
continue;
int prev = (i == 0 || protected_fds[i-1] < first) ? first : protected_fds[i-1]+1;