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ss_util.c
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ss_util.c
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#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <unistd.h>
#include "ss_defines.h"
#include "ss_util.h"
static uint32_t crc32_tab[] = {
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
};
/*
* Random table for Pearson hashing function below. Each 8-bit value only
* appears once in the table and those values are expected to be randomly
* distributed.
*/
static const uint8_t hash_tab[256] = {
175, 235, 43, 181, 108, 210, 253, 28, 1, 41, 173, 78, 218, 61, 32,
17, 31, 158, 147, 186, 206, 254, 239, 39, 85, 152, 150, 92, 196, 11,
164, 72, 222, 8, 183, 129, 180, 234, 29, 121, 79, 116, 212, 16, 117,
193, 189, 226, 199, 50, 9, 131, 14, 47, 80, 203, 124, 53, 162, 238,
83, 157, 231, 88, 110, 109, 62, 245, 114, 105, 73, 242, 22, 56, 84,
42, 0, 38, 144, 94, 249, 77, 137, 224, 74, 168, 75, 59, 71, 248,
208, 44, 176, 112, 184, 182, 190, 246, 10, 192, 115, 146, 195, 160, 15,
48, 145, 191, 107, 100, 58, 104, 217, 102, 76, 170, 149, 111, 148, 132,
142, 66, 237, 69, 27, 89, 126, 82, 87, 227, 171, 232, 185, 49, 216,
135, 243, 251, 103, 141, 236, 153, 228, 64, 93, 25, 21, 20, 127, 155,
98, 23, 67, 51, 40, 99, 201, 241, 214, 34, 60, 18, 159, 45, 166,
55, 205, 86, 134, 219, 169, 204, 26, 244, 174, 143, 198, 65, 140, 122,
161, 165, 223, 207, 187, 178, 118, 202, 13, 177, 230, 197, 54, 194, 247,
119, 113, 136, 221, 133, 57, 12, 167, 81, 70, 172, 30, 255, 5, 37,
213, 101, 215, 90, 6, 52, 33, 97, 240, 123, 233, 7, 63, 125, 120,
2, 188, 128, 179, 96, 154, 95, 24, 209, 151, 35, 252, 19, 46, 106,
163, 225, 138, 211, 130, 220, 156, 229, 91, 200, 36, 3, 250, 68, 4,
139
};
uint32_t
ss_crc32(const void *buf, size_t size)
{
const uint8_t *p = buf;
uint32_t crc;
crc = ~0U;
while (size--)
crc = crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);
return crc ^ ~0U;
}
/* Variant of Pearson hashing function */
uint32_t
hash_string(str *buf, int rounds)
{
uint32_t res;
uint8_t ires, *bp, *ep;
int i;
res = 0;
ep = (uint8_t *)(buf->s + buf->len);
for (i = 0; i < rounds; i++) {
ires = hash_tab[buf->len & 0xff];
for (bp = (uint8_t *)buf->s; bp != ep; bp++) {
ires = hash_tab[ires ^ (uint8_t)(bp[0] + i)];
}
res <<= 8;
res |= ires;
}
return res;
}
/*
* Portable daemon(3) implementation, borrowed from FreeBSD. For license
* and other information see:
*
* $FreeBSD: src/lib/libc/gen/daemon.c,v 1.8 2007/01/09 00:27:53 imp Exp $
*/
int
ss_daemon(int nochdir, int redirect_fd)
{
struct sigaction osa, sa;
pid_t newgrp;
int oerrno;
int osa_ok;
/* A SIGHUP may be thrown when the parent exits below. */
sigemptyset(&sa.sa_mask);
sa.sa_handler = SIG_IGN;
sa.sa_flags = 0;
osa_ok = sigaction(SIGHUP, &sa, &osa);
switch (fork()) {
case -1:
return (-1);
case 0:
break;
default:
_exit(0);
}
newgrp = setsid();
oerrno = errno;
if (osa_ok != -1)
sigaction(SIGHUP, &osa, NULL);
if (newgrp == -1) {
errno = oerrno;
return (-1);
}
if (!nochdir)
(void)chdir("/");
if (redirect_fd != -1) {
(void)dup2(redirect_fd, STDOUT_FILENO);
(void)dup2(redirect_fd, STDERR_FILENO);
if (redirect_fd > 2)
(void)close(redirect_fd);
redirect_fd = open("/dev/null", O_RDWR, 0);
if (redirect_fd != -1) {
(void)dup2(redirect_fd, STDIN_FILENO);
if (redirect_fd > 2)
(void)close(redirect_fd);
}
}
return (0);
}
int
drop_privileges(struct app_cfg *cf)
{
if (cf->stable.run_gname != NULL) {
if (setgid(cf->stable.run_gid) != 0) {
fprintf(stderr, "can't set current group ID: %d\n", cf->stable.run_gid);
return (-1);
}
}
if (cf->stable.run_uname == NULL)
return 0;
if (setuid(cf->stable.run_uid) != 0) {
fprintf(stderr, "can't set current user ID: %d\n", cf->stable.run_uid);
return (-1);
}
return 0;
}