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/*
* utils.c
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*
*/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <resolv.h>
#include <asm/types.h>
#include <linux/pkt_sched.h>
#include <time.h>
#include <sys/time.h>


#include "utils.h"

int get_integer(int *val, const char *arg, int base)
{
long res;
char *ptr;

if (!arg || !*arg)
return -1;
res = strtol(arg, &ptr, base);
if (!ptr || ptr == arg || *ptr || res > INT_MAX || res < INT_MIN)
return -1;
*val = res;
return 0;
}

int mask2bits(__u32 netmask)
{
unsigned bits = 0;
__u32 mask = ntohl(netmask);
__u32 host = ~mask;

/* a valid netmask must be 2^n - 1 */
if ((host & (host + 1)) != 0)
return -1;

for (; mask; mask <<= 1)
++bits;
return bits;
}

static int get_netmask(unsigned *val, const char *arg, int base)
{
inet_prefix addr;

if (!get_unsigned(val, arg, base))
return 0;

/* try coverting dotted quad to CIDR */
if (!get_addr_1(&addr, arg, AF_INET) && addr.family == AF_INET) {
int b = mask2bits(addr.data[0]);

if (b >= 0) {
*val = b;
return 0;
}
}

return -1;
}

int get_unsigned(unsigned *val, const char *arg, int base)
{
unsigned long res;
char *ptr;

if (!arg || !*arg)
return -1;
res = strtoul(arg, &ptr, base);
if (!ptr || ptr == arg || *ptr || res > UINT_MAX)
return -1;
*val = res;
return 0;
}

/*
* get_jiffies is "translated" from a similar routine "get_time" in
* tc_util.c. we don't use the exact same routine because tc passes
* microseconds to the kernel and the callers of get_jiffies want
* to pass jiffies, and have a different assumption for the units of
* a "raw" number.
*/

int get_jiffies(unsigned *jiffies, const char *arg, int base, int *raw)
{
double t;
unsigned long res;
char *p;

if (strchr(arg,'.') != NULL) {
t = strtod(arg,&p);
if (t < 0.0)
return -1;
}
else {
res = strtoul(arg,&p,base);
if (res > UINT_MAX)
return -1;
t = (double)res;
}
if (p == arg)
return -1;

if (__iproute2_hz_internal == 0)
                __iproute2_hz_internal = __get_hz();

*raw = 1;

if (*p) {
*raw = 0;
                if (strcasecmp(p, "s") == 0 || strcasecmp(p, "sec")==0 ||
                    strcasecmp(p, "secs")==0)
                        t *= __iproute2_hz_internal;
                else if (strcasecmp(p, "ms") == 0 || strcasecmp(p, "msec")==0 ||
                         strcasecmp(p, "msecs") == 0)
                        t *= __iproute2_hz_internal/1000.0;
                else if (strcasecmp(p, "us") == 0 || strcasecmp(p, "usec")==0 ||
                         strcasecmp(p, "usecs") == 0)
                        t *= __iproute2_hz_internal/1000000.0;
                else if (strcasecmp(p, "ns") == 0 || strcasecmp(p, "nsec")==0 ||
                         strcasecmp(p, "nsecs") == 0)
                        t *= __iproute2_hz_internal/1000000000.0;
else if (strcasecmp(p, "j") == 0 || strcasecmp(p, "hz") == 0 ||
strcasecmp(p,"jiffies") == 0)
t *= 1.0; /* allow suffix, do nothing */
                else
                        return -1;
        }

/* emulate ceil() without having to bring-in -lm and always be >= 1 */

*jiffies = t;
if (*jiffies < t)
*jiffies += 1;

        return 0;

}

int get_u64(__u64 *val, const char *arg, int base)
{
unsigned long long res;
char *ptr;

if (!arg || !*arg)
return -1;
res = strtoull(arg, &ptr, base);
if (!ptr || ptr == arg || *ptr || res == 0xFFFFFFFFULL)
  return -1;
  *val = res;
  return 0;
}

int get_u32(__u32 *val, const char *arg, int base)
{
unsigned long res;
char *ptr;

if (!arg || !*arg)
return -1;
res = strtoul(arg, &ptr, base);
if (!ptr || ptr == arg || *ptr || res > 0xFFFFFFFFUL)
return -1;
*val = res;
return 0;
}

int get_u16(__u16 *val, const char *arg, int base)
{
unsigned long res;
char *ptr;

if (!arg || !*arg)
return -1;
res = strtoul(arg, &ptr, base);
if (!ptr || ptr == arg || *ptr || res > 0xFFFF)
return -1;
*val = res;
return 0;
}

int get_u8(__u8 *val, const char *arg, int base)
{
unsigned long res;
char *ptr;

if (!arg || !*arg)
return -1;
res = strtoul(arg, &ptr, base);
if (!ptr || ptr == arg || *ptr || res > 0xFF)
return -1;
*val = res;
return 0;
}

int get_s16(__s16 *val, const char *arg, int base)
{
long res;
char *ptr;

if (!arg || !*arg)
return -1;
res = strtol(arg, &ptr, base);
if (!ptr || ptr == arg || *ptr || res > 0x7FFF || res < -0x8000)
return -1;
*val = res;
return 0;
}

int get_s8(__s8 *val, const char *arg, int base)
{
long res;
char *ptr;

if (!arg || !*arg)
return -1;
res = strtol(arg, &ptr, base);
if (!ptr || ptr == arg || *ptr || res > 0x7F || res < -0x80)
return -1;
*val = res;
return 0;
}

/* This uses a non-standard parsing (ie not inet_aton, or inet_pton)
* because of legacy choice to parse 10.8 as 10.8.0.0 not 10.0.0.8
*/
static int get_addr_ipv4(__u8 *ap, const char *cp)
{
int i;

for (i = 0; i < 4; i++) {
unsigned long n;
char *endp;

n = strtoul(cp, &endp, 0);
if (n > 255)
return -1; /* bogus network value */

if (endp == cp) /* no digits */
return -1;

ap[i] = n;

if (*endp == '\0')
break;

if (i == 3 || *endp != '.')
return -1; /* extra characters */
cp = endp + 1;
}

return 1;
}

int get_addr_1(inet_prefix *addr, const char *name, int family)
{
memset(addr, 0, sizeof(*addr));

if (strcmp(name, "default") == 0 ||
strcmp(name, "all") == 0 ||
strcmp(name, "any") == 0) {
if (family == AF_DECnet)
return -1;
addr->family = family;
addr->bytelen = (family == AF_INET6 ? 16 : 4);
addr->bitlen = -1;
return 0;
}

if (strchr(name, ':')) {
addr->family = AF_INET6;
if (family != AF_UNSPEC && family != AF_INET6)
return -1;
if (inet_pton(AF_INET6, name, addr->data) <= 0)
return -1;
addr->bytelen = 16;
addr->bitlen = -1;
return 0;
}

if (family == AF_DECnet) {
struct dn_naddr dna;
addr->family = AF_DECnet;
if (dnet_pton(AF_DECnet, name, &dna) <= 0)
return -1;
memcpy(addr->data, dna.a_addr, 2);
addr->bytelen = 2;
addr->bitlen = -1;
return 0;
}

addr->family = AF_INET;
if (family != AF_UNSPEC && family != AF_INET)
return -1;

if (get_addr_ipv4((__u8 *)addr->data, name) <= 0)
return -1;

addr->bytelen = 4;
addr->bitlen = -1;
return 0;
}

int get_prefix_1(inet_prefix *dst, char *arg, int family)
{
int err;
unsigned plen;
char *slash;

memset(dst, 0, sizeof(*dst));

if (strcmp(arg, "default") == 0 ||
strcmp(arg, "any") == 0 ||
strcmp(arg, "all") == 0) {
if (family == AF_DECnet)
return -1;
dst->family = family;
dst->bytelen = 0;
dst->bitlen = 0;
return 0;
}

slash = strchr(arg, '/');
if (slash)
*slash = 0;

err = get_addr_1(dst, arg, family);
if (err == 0) {
switch(dst->family) {
case AF_INET6:
dst->bitlen = 128;
break;
case AF_DECnet:
dst->bitlen = 16;
break;
default:
case AF_INET:
dst->bitlen = 32;
}
if (slash) {
if (get_netmask(&plen, slash+1, 0)
|| plen > dst->bitlen) {
err = -1;
goto done;
}
dst->flags |= PREFIXLEN_SPECIFIED;
dst->bitlen = plen;
}
}
done:
if (slash)
*slash = '/';
return err;
}

int get_addr(inet_prefix *dst, const char *arg, int family)
{
if (family == AF_PACKET) {
fprintf(stderr, "Error: \"%s\" may be inet address, but it is not allowed in this context.\n", arg);
exit(1);
}
if (get_addr_1(dst, arg, family)) {
fprintf(stderr, "Error: an inet address is expected rather than \"%s\".\n", arg);
exit(1);
}
return 0;
}

int get_prefix(inet_prefix *dst, char *arg, int family)
{
if (family == AF_PACKET) {
fprintf(stderr, "Error: \"%s\" may be inet prefix, but it is not allowed in this context.\n", arg);
exit(1);
}
if (get_prefix_1(dst, arg, family)) {
fprintf(stderr, "Error: an inet prefix is expected rather than \"%s\".\n", arg);
exit(1);
}
return 0;
}

__u32 get_addr32(const char *name)
{
inet_prefix addr;
if (get_addr_1(&addr, name, AF_INET)) {
fprintf(stderr, "Error: an IP address is expected rather than \"%s\"\n", name);
exit(1);
}
return addr.data[0];
}

void incomplete_command(void)
{
fprintf(stderr, "Command line is not complete. Try option \"help\"\n");
exit(-1);
}

void missarg(const char *key)
{
fprintf(stderr, "Error: argument \"%s\" is required\n", key);
exit(-1);
}

void invarg(const char *msg, const char *arg)
{
fprintf(stderr, "Error: argument \"%s\" is wrong: %s\n", arg, msg);
exit(-1);
}

void duparg(const char *key, const char *arg)
{
fprintf(stderr, "Error: duplicate \"%s\": \"%s\" is the second value.\n", key, arg);
exit(-1);
}

void duparg2(const char *key, const char *arg)
{
fprintf(stderr, "Error: either \"%s\" is duplicate, or \"%s\" is a garbage.\n", key, arg);
exit(-1);
}

int matches(const char *cmd, const char *pattern)
{
int len = strlen(cmd);
if (len > strlen(pattern))
return -1;
return memcmp(pattern, cmd, len);
}

int inet_addr_match(const inet_prefix *a, const inet_prefix *b, int bits)
{
const __u32 *a1 = a->data;
const __u32 *a2 = b->data;
int words = bits >> 0x05;

bits &= 0x1f;

if (words)
if (memcmp(a1, a2, words << 2))
return -1;

if (bits) {
__u32 w1, w2;
__u32 mask;

w1 = a1[words];
w2 = a2[words];

mask = htonl((0xffffffff) << (0x20 - bits));

if ((w1 ^ w2) & mask)
return 1;
}

return 0;
}

int __iproute2_hz_internal;

int __get_hz(void)
{
char name[1024];
int hz = 0;
FILE *fp;

if (getenv("HZ"))
return atoi(getenv("HZ")) ? : HZ;

if (getenv("PROC_NET_PSCHED")) {
snprintf(name, sizeof(name)-1, "%s", getenv("PROC_NET_PSCHED"));
} else if (getenv("PROC_ROOT")) {
snprintf(name, sizeof(name)-1, "%s/net/psched", getenv("PROC_ROOT"));
} else {
strcpy(name, "/proc/net/psched");
}
fp = fopen(name, "r");

if (fp) {
unsigned nom, denom;
if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2)
if (nom == 1000000)
hz = denom;
fclose(fp);
}
if (hz)
return hz;
return HZ;
}

int __iproute2_user_hz_internal;

int __get_user_hz(void)
{
return sysconf(_SC_CLK_TCK);
}

const char *rt_addr_n2a(int af, int len, const void *addr, char *buf, int buflen)
{
switch (af) {
case AF_INET:
case AF_INET6:
return inet_ntop(af, addr, buf, buflen);
case AF_IPX:
return ipx_ntop(af, addr, buf, buflen);
case AF_DECnet:
{
struct dn_naddr dna = { 2, { 0, 0, }};
memcpy(dna.a_addr, addr, 2);
return dnet_ntop(af, &dna, buf, buflen);
}
default:
return "???";
}
}

#ifdef RESOLVE_HOSTNAMES
struct namerec
{
struct namerec *next;
const char *name;
inet_prefix addr;
};

#define NHASH 257
static struct namerec *nht[NHASH];

static const char *resolve_address(const void *addr, int len, int af)
{
struct namerec *n;
struct hostent *h_ent;
unsigned hash;
static int notfirst;


if (af == AF_INET6 && ((__u32*)addr)[0] == 0 &&
((__u32*)addr)[1] == 0 && ((__u32*)addr)[2] == htonl(0xffff)) {
af = AF_INET;
addr += 12;
len = 4;
}

hash = *(__u32 *)(addr + len - 4) % NHASH;

for (n = nht[hash]; n; n = n->next) {
if (n->addr.family == af &&
n->addr.bytelen == len &&
memcmp(n->addr.data, addr, len) == 0)
return n->name;
}
if ((n = malloc(sizeof(*n))) == NULL)
return NULL;
n->addr.family = af;
n->addr.bytelen = len;
n->name = NULL;
memcpy(n->addr.data, addr, len);
n->next = nht[hash];
nht[hash] = n;
if (++notfirst == 1)
sethostent(1);
fflush(stdout);

if ((h_ent = gethostbyaddr(addr, len, af)) != NULL)
n->name = strdup(h_ent->h_name);

/* Even if we fail, "negative" entry is remembered. */
return n->name;
}
#endif


const char *format_host(int af, int len, const void *addr,
char *buf, int buflen)
{
#ifdef RESOLVE_HOSTNAMES
if (resolve_hosts) {
const char *n;

if (len <= 0) {
switch (af) {
case AF_INET:
len = 4;
break;
case AF_INET6:
len = 16;
break;
case AF_IPX:
len = 10;
break;
#ifdef AF_DECnet
/* I see no reasons why gethostbyname
may not work for DECnet */
case AF_DECnet:
len = 2;
break;
#endif
default: ;
}
}
if (len > 0 &&
(n = resolve_address(addr, len, af)) != NULL)
return n;
}
#endif
return rt_addr_n2a(af, len, addr, buf, buflen);
}


char *hexstring_n2a(const __u8 *str, int len, char *buf, int blen)
{
char *ptr = buf;
int i;

for (i=0; i<len; i++) {
if (blen < 3)
break;
sprintf(ptr, "%02x", str[i]);
ptr += 2;
blen -= 2;
if (i != len-1 && blen > 1) {
*ptr++ = ':';
blen--;
}
}
return buf;
}

__u8* hexstring_a2n(const char *str, __u8 *buf, int blen)
{
int cnt = 0;

for (;;) {
unsigned acc;
char ch;

acc = 0;

while ((ch = *str) != ':' && ch != 0) {
if (ch >= '0' && ch <= '9')
ch -= '0';
else if (ch >= 'a' && ch <= 'f')
ch -= 'a'-10;
else if (ch >= 'A' && ch <= 'F')
ch -= 'A'-10;
else
return NULL;
acc = (acc<<4) + ch;
str++;
}

if (acc > 255)
return NULL;
if (cnt < blen) {
buf[cnt] = acc;
cnt++;
}
if (ch == 0)
break;
++str;
}
if (cnt < blen)
memset(buf+cnt, 0, blen-cnt);
return buf;
}

int print_timestamp(FILE *fp)
{
struct timeval tv;
char *tstr;

memset(&tv, 0, sizeof(tv));
gettimeofday(&tv, NULL);

tstr = asctime(localtime(&tv.tv_sec));
tstr[strlen(tstr)-1] = 0;
fprintf(fp, "Timestamp: %s %lu usec\n", tstr, tv.tv_usec);
return 0;
}

int cmdlineno;

/* Like glibc getline but handle continuation lines and comments */
ssize_t getcmdline(char **linep, size_t *lenp, FILE *in)
{
ssize_t cc;
char *cp;

if ((cc = getline(linep, lenp, in)) < 0)
return cc; /* eof or error */
++cmdlineno;

cp = strchr(*linep, '#');
if (cp)
*cp = '\0';

while ((cp = strstr(*linep, "\\\n")) != NULL) {
char *line1 = NULL;
size_t len1 = 0;
size_t cc1;

if ((cc1 = getline(&line1, &len1, in)) < 0) {
fprintf(stderr, "Missing continuation line\n");
return cc1;
}

++cmdlineno;
*cp = 0;

cp = strchr(line1, '#');
if (cp)
*cp = '\0';

*lenp = strlen(*linep) + strlen(line1) + 1;
*linep = realloc(*linep, *lenp);
if (!*linep) {
fprintf(stderr, "Out of memory\n");
*lenp = 0;
return -1;
}
cc += cc1 - 2;
strcat(*linep, line1);
free(line1);
}
return cc;
}

/* split command line into argument vector */
int makeargs(char *line, char *argv[], int maxargs)
{
static const char ws[] = " \t\r\n";
char *cp;
int argc = 0;

for (cp = strtok(line, ws); cp; cp = strtok(NULL, ws)) {
if (argc >= (maxargs - 1)) {
fprintf(stderr, "Too many arguments to command\n");
exit(1);
}
argv[argc++] = cp;
}
argv[argc] = NULL;

return argc;
}
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