ssize_t
print_option(char *s, ssize_t len, int type, int dl, const uint8_t *data,
const char *ifname)
{
const uint8_t *e, *t;
uint16_t u16;
int16_t s16;
uint32_t u32;
int32_t s32;
struct in_addr addr;
ssize_t bytes = 0;
ssize_t l;
char *tmp;
if (type & RFC3397) {
l = decode_rfc3397(NULL, 0, dl, data);
if (l < 1)
return l;
tmp = malloc(l);
if (tmp == NULL)
return -1;
decode_rfc3397(tmp, l, dl, data);
l = print_string(s, len, l - 1, (uint8_t *)tmp);
free(tmp);
return l;
}
#ifdef INET
if (type & RFC3361) {
if ((tmp = decode_rfc3361(dl, data)) == NULL)
return -1;
l = strlen(tmp);
l = print_string(s, len, l - 1, (uint8_t *)tmp);
free(tmp);
return l;
}
if (type & RFC3442)
return decode_rfc3442(s, len, dl, data);
if (type & RFC5969)
return decode_rfc5969(s, len, dl, data);
#endif
if (type & STRING) {
/* Some DHCP servers return NULL strings */
if (*data == '\0')
return 0;
return print_string(s, len, dl, data);
}
if (type & FLAG) {
if (s) {
*s++ = '1';
*s = '\0';
}
return 2;
}
/* DHCPv6 status code */
if (type & SCODE && dl >= (int)sizeof(u16)) {
if (s) {
memcpy(&u16, data, sizeof(u16));
u16 = ntohs(u16);
l = snprintf(s, len, "%d ", u16);
len -= l;
} else
l = 7;
data += sizeof(u16);
dl -= sizeof(u16);
if (dl)
l += print_option(s, len, STRING, dl, data, ifname);
return l;
}
if (!s) {
if (type & UINT8)
l = 3;
else if (type & UINT16) {
l = 5;
dl /= 2;
} else if (type & SINT16) {
l = 6;
dl /= 2;
} else if (type & UINT32) {
l = 10;
dl /= 4;
} else if (type & SINT32) {
l = 11;
dl /= 4;
} else if (type & ADDRIPV4) {
l = 16;
dl /= 4;
}
#ifdef INET6
else if (type & ADDRIPV6) {
e = data + dl;
l = 0;
while (data < e) {
if (l)
l++; /* space */
dl = ipv6_printaddr(NULL, 0, data, ifname);
if (dl != -1)
l += dl;
data += 16;
}
return l + 1;
}
#endif
else if (type & BINHEX) {
l = 2;
} else {
errno = EINVAL;
return -1;
}
return (l + 1) * dl;
}
t = data;
e = data + dl;
while (data < e) {
if (data != t && type != BINHEX) {
*s++ = ' ';
bytes++;
len--;
}
if (type & UINT8) {
l = snprintf(s, len, "%d", *data);
data++;
} else if (type & UINT16) {
memcpy(&u16, data, sizeof(u16));
u16 = ntohs(u16);
l = snprintf(s, len, "%d", u16);
data += sizeof(u16);
} else if (type & SINT16) {
memcpy(&s16, data, sizeof(s16));
s16 = ntohs(s16);
l = snprintf(s, len, "%d", s16);
data += sizeof(s16);
} else if (type & UINT32) {
memcpy(&u32, data, sizeof(u32));
u32 = ntohl(u32);
l = snprintf(s, len, "%d", u32);
data += sizeof(u32);
} else if (type & SINT32) {
memcpy(&s32, data, sizeof(s32));
s32 = ntohl(s32);
l = snprintf(s, len, "%d", s32);
data += sizeof(s32);
} else if (type & ADDRIPV4) {
memcpy(&addr.s_addr, data, sizeof(addr.s_addr));
l = snprintf(s, len, "%s", inet_ntoa(addr));
data += sizeof(addr.s_addr);
}
#ifdef INET6
else if (type & ADDRIPV6) {
dl = ipv6_printaddr(s, len, data, ifname);
if (dl != -1)
l = dl;
else
l = 0;
data += 16;
}
#endif
else if (type & BINHEX) {
l = snprintf(s, len, "%.2x", data[0]);
data++;
} else
l = 0;
len -= l;
bytes += l;
s += l;
}
return bytes;
}
static ssize_t
print_option(char *s, ssize_t len, int type, int dl, const uint8_t *data)
{
const uint8_t *e, *t;
uint16_t u16;
int16_t s16;
uint32_t u32;
int32_t s32;
struct in_addr addr;
ssize_t bytes = 0;
ssize_t l;
char *tmp;
if (type & RFC3397) {
l = decode_rfc3397(NULL, 0, dl, data);
if (l < 1)
return l;
tmp = xmalloc(l);
decode_rfc3397(tmp, l, dl, data);
l = print_string(s, len, l - 1, (uint8_t *)tmp);
free(tmp);
return l;
}
if (type & RFC3442)
return decode_rfc3442(s, len, dl, data);
if (type & STRING) {
/* Some DHCP servers return NULL strings */
if (*data == '\0')
return 0;
return print_string(s, len, dl, data);
}
if (!s) {
if (type & UINT8)
l = 3;
else if (type & UINT16)
l = 5;
else if (type & SINT16)
l = 6;
else if (type & UINT32)
l = 10;
else if (type & SINT32)
l = 11;
else if (type & IPV4)
l = 16;
else {
errno = EINVAL;
return -1;
}
return (l + 1) * dl;
}
t = data;
e = data + dl;
while (data < e) {
if (data != t) {
*s++ = ' ';
bytes++;
len--;
}
if (type & UINT8) {
l = snprintf(s, len, "%d", *data);
data++;
} else if (type & UINT16) {
memcpy(&u16, data, sizeof(u16));
u16 = ntohs(u16);
l = snprintf(s, len, "%d", u16);
data += sizeof(u16);
} else if (type & SINT16) {
memcpy(&s16, data, sizeof(s16));
s16 = ntohs(s16);
l = snprintf(s, len, "%d", s16);
data += sizeof(s16);
} else if (type & UINT32) {
memcpy(&u32, data, sizeof(u32));
u32 = ntohl(u32);
l = snprintf(s, len, "%d", u32);
data += sizeof(u32);
} else if (type & SINT32) {
memcpy(&s32, data, sizeof(s32));
s32 = ntohl(s32);
l = snprintf(s, len, "%d", s32);
data += sizeof(s32);
} else if (type & IPV4) {
memcpy(&addr.s_addr, data, sizeof(addr.s_addr));
l = snprintf(s, len, "%s", inet_ntoa(addr));
data += sizeof(addr.s_addr);
} else
l = 0;
len -= l;
bytes += l;
s += l;
}
return bytes;
}