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-rw-r--r--package/owipcalc/src/owipcalc.c365
1 files changed, 265 insertions, 100 deletions
diff --git a/package/owipcalc/src/owipcalc.c b/package/owipcalc/src/owipcalc.c
index 06d163e2f..18013136b 100644
--- a/package/owipcalc/src/owipcalc.c
+++ b/package/owipcalc/src/owipcalc.c
@@ -36,8 +36,9 @@ struct cidr {
} addr;
union {
char v4[sizeof("255.255.255.255/255.255.255.255 ")];
- char v6[sizeof("FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF/128 ")];
+ char v6[sizeof("FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:255.255.255.255/128 ")];
} buf;
+ struct cidr *next;
};
struct op {
@@ -57,6 +58,54 @@ struct op {
static bool quiet = false;
static bool printed = false;
+static struct cidr *stack = NULL;
+
+#define qprintf(...) \
+ do { \
+ if (!quiet) printf(__VA_ARGS__); \
+ printed = true; \
+ } while(0)
+
+static void cidr_push(struct cidr *a)
+{
+ if (a)
+ {
+ a->next = stack;
+ stack = a;
+ }
+}
+
+static bool cidr_pop(struct cidr *a)
+{
+ struct cidr *old = stack;
+
+ if (old)
+ {
+ stack = stack->next;
+ free(old);
+
+ return true;
+ }
+
+ return false;
+}
+
+static struct cidr * cidr_clone(struct cidr *a)
+{
+ struct cidr *b = malloc(sizeof(*b));
+
+ if (!b)
+ {
+ fprintf(stderr, "out of memory\n");
+ exit(255);
+ }
+
+ memcpy(b, a, sizeof(*b));
+ cidr_push(b);
+
+ return b;
+}
+
static struct cidr * cidr_parse4(const char *s)
{
@@ -115,7 +164,9 @@ static bool cidr_add4(struct cidr *a, struct cidr *b)
uint32_t x = ntohl(a->addr.v4.s_addr);
uint32_t y = ntohl(b->addr.v4.s_addr);
- if ((a->family != AF_INET) || (b->family != AF_INET))
+ struct cidr *n = cidr_clone(a);
+
+ if ((n->family != AF_INET) || (b->family != AF_INET))
return false;
if ((uint32_t)(x + y) < x)
@@ -124,7 +175,7 @@ static bool cidr_add4(struct cidr *a, struct cidr *b)
return false;
}
- a->addr.v4.s_addr = htonl(x + y);
+ n->addr.v4.s_addr = htonl(x + y);
return true;
}
@@ -133,7 +184,9 @@ static bool cidr_sub4(struct cidr *a, struct cidr *b)
uint32_t x = ntohl(a->addr.v4.s_addr);
uint32_t y = ntohl(b->addr.v4.s_addr);
- if ((a->family != AF_INET) || (b->family != AF_INET))
+ struct cidr *n = cidr_clone(a);
+
+ if ((n->family != AF_INET) || (b->family != AF_INET))
return false;
if ((uint32_t)(x - y) > x)
@@ -142,21 +195,27 @@ static bool cidr_sub4(struct cidr *a, struct cidr *b)
return false;
}
- a->addr.v4.s_addr = htonl(x - y);
+ n->addr.v4.s_addr = htonl(x - y);
return true;
}
static bool cidr_network4(struct cidr *a)
{
- a->addr.v4.s_addr &= htonl(~((1 << (32 - a->prefix)) - 1));
- a->prefix = 32;
+ struct cidr *n = cidr_clone(a);
+
+ n->addr.v4.s_addr &= htonl(~((1 << (32 - n->prefix)) - 1));
+ n->prefix = 32;
+
return true;
}
static bool cidr_broadcast4(struct cidr *a)
{
- a->addr.v4.s_addr |= htonl(((1 << (32 - a->prefix)) - 1));
- a->prefix = 32;
+ struct cidr *n = cidr_clone(a);
+
+ n->addr.v4.s_addr |= htonl(((1 << (32 - n->prefix)) - 1));
+ n->prefix = 32;
+
return true;
}
@@ -165,31 +224,24 @@ static bool cidr_contains4(struct cidr *a, struct cidr *b)
uint32_t net1 = a->addr.v4.s_addr & htonl(~((1 << (32 - a->prefix)) - 1));
uint32_t net2 = b->addr.v4.s_addr & htonl(~((1 << (32 - a->prefix)) - 1));
- printed = true;
-
if ((b->prefix >= a->prefix) && (net1 == net2))
{
- if (!quiet) printf("1\n");
+ qprintf("1\n");
return true;
}
else
{
- if (!quiet) printf("0\n");
+ qprintf("0\n");
return false;
}
}
static bool cidr_netmask4(struct cidr *a)
{
- struct in_addr mask;
- char buf[sizeof("255.255.255.255 ")];
-
- mask.s_addr = htonl(~((1 << (32 - a->prefix)) - 1));
+ struct cidr *n = cidr_clone(a);
- if (!quiet)
- printf("%s\n", inet_ntop(AF_INET, &mask, buf, sizeof(buf)));
-
- printed = true;
+ n->addr.v4.s_addr = htonl(~((1 << (32 - n->prefix)) - 1));
+ n->prefix = 32;
return true;
}
@@ -198,18 +250,16 @@ static bool cidr_private4(struct cidr *a)
{
uint32_t x = ntohl(a->addr.v4.s_addr);
- printed = true;
-
if (((x >= 0x0A000000) && (x <= 0x0AFFFFFF)) ||
((x >= 0xAC100000) && (x <= 0xAC1FFFFF)) ||
((x >= 0xC0A80000) && (x <= 0xC0A8FFFF)))
{
- if (!quiet) printf("1\n");
+ qprintf("1\n");
return true;
}
else
{
- if (!quiet) printf("0\n");
+ qprintf("0\n");
return false;
}
}
@@ -218,40 +268,77 @@ static bool cidr_linklocal4(struct cidr *a)
{
uint32_t x = ntohl(a->addr.v4.s_addr);
- printed = true;
-
if ((x >= 0xA9FE0000) && (x <= 0xA9FEFFFF))
{
- if (!quiet) printf("1\n");
+ qprintf("1\n");
return true;
}
else
{
- if (!quiet) printf("0\n");
+ qprintf("0\n");
return false;
}
}
+static bool cidr_prev4(struct cidr *a, struct cidr *b)
+{
+ struct cidr *n = cidr_clone(a);
+
+ n->prefix = b->prefix;
+ n->addr.v4.s_addr -= htonl(1 << (32 - b->prefix));
+
+ return true;
+}
+
+static bool cidr_next4(struct cidr *a, struct cidr *b)
+{
+ struct cidr *n = cidr_clone(a);
+
+ n->prefix = b->prefix;
+ n->addr.v4.s_addr += htonl(1 << (32 - b->prefix));
+
+ return true;
+}
+
+static bool cidr_6to4(struct cidr *a)
+{
+ struct cidr *n = cidr_clone(a);
+ uint32_t x = a->addr.v4.s_addr;
+
+ memset(&n->addr.v6.s6_addr, 0, sizeof(n->addr.v6.s6_addr));
+
+ n->family = AF_INET6;
+ n->prefix = 48;
+
+ n->addr.v6.s6_addr[0] = 0x20;
+ n->addr.v6.s6_addr[1] = 0x02;
+ n->addr.v6.s6_addr[2] = (x >> 24);
+ n->addr.v6.s6_addr[3] = (x >> 16) & 0xFF;
+ n->addr.v6.s6_addr[4] = (x >> 8) & 0xFF;
+ n->addr.v6.s6_addr[5] = x & 0xFF;
+
+ return true;
+}
+
static bool cidr_print4(struct cidr *a)
{
char *p;
- if (a->family != AF_INET)
+ if (!a || (a->family != AF_INET))
return false;
if (!(p = (char *)inet_ntop(AF_INET, &a->addr.v4, a->buf.v4, sizeof(a->buf.v4))))
return false;
- if (!quiet)
- printf("%s", p);
+ if (printed)
+ qprintf(" ");
- if (!quiet && (a->prefix < 32))
- printf("/%u", a->prefix);
+ qprintf("%s", p);
- if (!quiet)
- printf("\n");
+ if (a->prefix < 32)
+ qprintf("/%u", a->prefix);
- printed = true;
+ cidr_pop(a);
return true;
}
@@ -265,11 +352,11 @@ static struct cidr * cidr_parse6(const char *s)
if (!addr || (strlen(s) >= sizeof(addr->buf.v6)))
goto err;
- snprintf(addr->buf.v6, sizeof(addr->buf.v6), "%s", s);
+ snprintf(addr->buf.v4, sizeof(addr->buf.v6), "%s", s);
addr->family = AF_INET6;
- if ((p = strchr(addr->buf.v6, '/')) != NULL)
+ if ((p = strchr(addr->buf.v4, '/')) != NULL)
{
*p++ = 0;
@@ -283,9 +370,9 @@ static struct cidr * cidr_parse6(const char *s)
addr->prefix = 128;
}
- if (p == addr->buf.v6+1)
+ if (p == addr->buf.v4+1)
memset(&addr->addr.v6, 0, sizeof(addr->addr.v6));
- else if (inet_pton(AF_INET6, addr->buf.v6, &addr->addr.v6) != 1)
+ else if (inet_pton(AF_INET6, addr->buf.v4, &addr->addr.v6) != 1)
goto err;
return addr;
@@ -301,7 +388,8 @@ static bool cidr_add6(struct cidr *a, struct cidr *b)
{
uint8_t idx = 15, carry = 0, overflow = 0;
- struct in6_addr *x = &a->addr.v6;
+ struct cidr *n = cidr_clone(a);
+ struct in6_addr *x = &n->addr.v6;
struct in6_addr *y = &b->addr.v6;
if ((a->family != AF_INET6) || (b->family != AF_INET6))
@@ -327,10 +415,11 @@ static bool cidr_sub6(struct cidr *a, struct cidr *b)
{
uint8_t idx = 15, carry = 0, underflow = 0;
- struct in6_addr *x = &a->addr.v6;
+ struct cidr *n = cidr_clone(a);
+ struct in6_addr *x = &n->addr.v6;
struct in6_addr *y = &b->addr.v6;
- if ((a->family != AF_INET6) || (b->family != AF_INET6))
+ if ((n->family != AF_INET6) || (b->family != AF_INET6))
return false;
do {
@@ -349,75 +438,134 @@ static bool cidr_sub6(struct cidr *a, struct cidr *b)
return true;
}
+static bool cidr_prev6(struct cidr *a, struct cidr *b)
+{
+ uint8_t idx, carry = 1, underflow = 0;
+ struct cidr *n = cidr_clone(a);
+ struct in6_addr *x = &n->addr.v6;
+
+ if (b->prefix == 0)
+ {
+ fprintf(stderr, "underflow during 'prev'\n");
+ return false;
+ }
+
+ idx = (b->prefix - 1) / 8;
+
+ do {
+ underflow = !!((x->s6_addr[idx] - carry) < 0);
+ x->s6_addr[idx] -= carry;
+ carry = underflow;
+ }
+ while (idx-- > 0);
+
+ if (carry)
+ {
+ fprintf(stderr, "underflow during 'prev'\n");
+ return false;
+ }
+
+ n->prefix = b->prefix;
+
+ return true;
+}
+
+static bool cidr_next6(struct cidr *a, struct cidr *b)
+{
+ uint8_t idx, carry = 1, overflow = 0;
+ struct cidr *n = cidr_clone(a);
+ struct in6_addr *x = &n->addr.v6;
+
+ if (b->prefix == 0)
+ {
+ fprintf(stderr, "overflow during 'next'\n");
+ return false;
+ }
+
+ idx = (b->prefix - 1) / 8;
+
+ do {
+ overflow = !!((x->s6_addr[idx] + carry) >= 256);
+ x->s6_addr[idx] += carry;
+ carry = overflow;
+ }
+ while (idx-- > 0);
+
+ if (carry)
+ {
+ fprintf(stderr, "overflow during 'next'\n");
+ return false;
+ }
+
+ n->prefix = b->prefix;
+
+ return true;
+}
+
static bool cidr_network6(struct cidr *a)
{
uint8_t i;
+ struct cidr *n = cidr_clone(a);
- for (i = 0; i < (128 - a->prefix) / 8; i++)
- a->addr.v6.s6_addr[15-i] = 0;
+ for (i = 0; i < (128 - n->prefix) / 8; i++)
+ n->addr.v6.s6_addr[15-i] = 0;
- if ((128 - a->prefix) % 8)
- a->addr.v6.s6_addr[15-i] &= ~((1 << ((128 - a->prefix) % 8)) - 1);
+ if ((128 - n->prefix) % 8)
+ n->addr.v6.s6_addr[15-i] &= ~((1 << ((128 - n->prefix) % 8)) - 1);
return true;
}
static bool cidr_contains6(struct cidr *a, struct cidr *b)
{
- struct in6_addr *x = &a->addr.v6;
+ struct cidr *n = cidr_clone(a);
+ struct in6_addr *x = &n->addr.v6;
struct in6_addr *y = &b->addr.v6;
-
- uint8_t i = (128 - a->prefix) / 8;
- uint8_t m = ~((1 << ((128 - a->prefix) % 8)) - 1);
+ uint8_t i = (128 - n->prefix) / 8;
+ uint8_t m = ~((1 << ((128 - n->prefix) % 8)) - 1);
uint8_t net1 = x->s6_addr[15-i] & m;
uint8_t net2 = y->s6_addr[15-i] & m;
- printed = true;
-
- if ((b->prefix >= a->prefix) && (net1 == net2) &&
+ if ((b->prefix >= n->prefix) && (net1 == net2) &&
((i == 15) || !memcmp(&x->s6_addr, &y->s6_addr, 15-i)))
{
- if (!quiet) printf("1\n");
+ qprintf("1\n");
return true;
}
else
{
- if (!quiet) printf("0\n");
+ qprintf("0\n");
return false;
}
}
static bool cidr_linklocal6(struct cidr *a)
{
- printed = true;
-
if ((a->addr.v6.s6_addr[0] == 0xFE) &&
(a->addr.v6.s6_addr[1] >= 0x80) &&
(a->addr.v6.s6_addr[1] <= 0xBF))
{
- if (!quiet) printf("1\n");
+ qprintf("1\n");
return true;
}
else
{
- if (!quiet) printf("0\n");
+ qprintf("0\n");
return false;
}
}
static bool cidr_ula6(struct cidr *a)
{
- printed = true;
-
if ((a->addr.v6.s6_addr[0] >= 0xFC) &&
(a->addr.v6.s6_addr[0] <= 0xFD))
{
- if (!quiet) printf("1\n");
+ qprintf("1\n");
return true;
}
else
{
- if (!quiet) printf("0\n");
+ qprintf("0\n");
return false;
}
}
@@ -426,22 +574,21 @@ static bool cidr_print6(struct cidr *a)
{
char *p;
- if (a->family != AF_INET6)
+ if (!a || (a->family != AF_INET6))
return NULL;
if (!(p = (char *)inet_ntop(AF_INET6, &a->addr.v6, a->buf.v6, sizeof(a->buf.v6))))
return false;
- if (!quiet)
- printf("%s", p);
+ if (printed)
+ qprintf(" ");
- if (!quiet && (a->prefix < 128))
- printf("/%u", a->prefix);
+ qprintf("%s", p);
- if (!quiet)
- printf("\n");
+ if (a->prefix < 128)
+ qprintf("/%u", a->prefix);
- printed = true;
+ cidr_pop(a);
return true;
}
@@ -465,13 +612,13 @@ static struct cidr * cidr_parse(const char *op, const char *s, int af_hint)
if (af_hint == AF_INET)
{
a->family = AF_INET;
- a->prefix = 32;
+ a->prefix = sum;
a->addr.v4.s_addr = htonl(sum);
}
else
{
a->family = AF_INET6;
- a->prefix = 128;
+ a->prefix = sum;
for (i = 0; i <= 15; i++)
{
@@ -505,15 +652,10 @@ static struct cidr * cidr_parse(const char *op, const char *s, int af_hint)
static bool cidr_howmany(struct cidr *a, struct cidr *b)
{
- if (!quiet)
- {
- if (b->prefix < a->prefix)
- printf("0\n");
- else
- printf("%u\n", 1 << (b->prefix - a->prefix));
- }
-
- printed = true;
+ if (b->prefix < a->prefix)
+ qprintf("0\n");
+ else
+ qprintf("%u\n", 1 << (b->prefix - a->prefix));
return true;
}
@@ -542,6 +684,16 @@ struct op ops[] = {
.f4.a2 = cidr_sub4,
.f6.a2 = cidr_sub6 },
+ { .name = "next",
+ .desc = "Advance base address to next prefix of given size",
+ .f4.a2 = cidr_next4,
+ .f6.a2 = cidr_next6 },
+
+ { .name = "prev",
+ .desc = "Lower base address to previous prefix of give size",
+ .f4.a2 = cidr_prev4,
+ .f6.a2 = cidr_prev6 },
+
{ .name = "network",
.desc = "Turn base address into network address",
.f4.a1 = cidr_network4,
@@ -557,46 +709,54 @@ struct op ops[] = {
.f6.a2 = cidr_prefix },
{ .name = "netmask",
- .desc = "Print netmask of base address, does not change base address",
+ .desc = "Calculate netmask of base address",
.f4.a1 = cidr_netmask4 },
+ { .name = "6to4",
+ .desc = "Calculate 6to4 prefix of given ipv4-address",
+ .f4.a1 = cidr_6to4 },
+
{ .name = "howmany",
- .desc = "Print amount of righ-hand prefixes that fit into base address, "
- "does not change base address",
+ .desc = "Print amount of righ-hand prefixes that fit into base address",
.f4.a2 = cidr_howmany,
.f6.a2 = cidr_howmany },
{ .name = "contains",
- .desc = "Print '1' if argument fits into base address or '0' "
- "if not, does not change base address",
+ .desc = "Print '1' if argument fits into base address or '0' if not",
.f4.a2 = cidr_contains4,
.f6.a2 = cidr_contains6 },
{ .name = "private",
.desc = "Print '1' if base address is in RFC1918 private space or '0' "
- "if not, does not change base address",
+ "if not",
.f4.a1 = cidr_private4 },
{ .name = "linklocal",
.desc = "Print '1' if base address is in 169.254.0.0/16 or FE80::/10 "
- "link local space or '0' if not, does not change base address",
+ "link local space or '0' if not",
.f4.a1 = cidr_linklocal4,
.f6.a1 = cidr_linklocal6 },
{ .name = "ula",
.desc = "Print '1' if base address is in FC00::/7 unique local address "
- "(ULA) space or '0' if not, does not change base address",
+ "(ULA) space or '0' if not",
.f6.a1 = cidr_ula6 },
{ .name = "quiet",
.desc = "Suppress output, useful for test operation where the result can "
- "be inferred from the exit code, does not change base address",
+ "be inferred from the exit code",
.f4.a1 = cidr_quiet,
.f6.a1 = cidr_quiet },
+ { .name = "pop",
+ .desc = "Pop intermediate result from stack",
+ .f4.a1 = cidr_pop,
+ .f6.a1 = cidr_pop },
+
{ .name = "print",
- .desc = "Print intermediate result, invoked implicitely at the end of "
- "calculation if no intermediate prints happened",
+ .desc = "Print intermediate result and pop it from stack, invoked "
+ "implicitely at the end of calculation if no intermediate prints "
+ "happened",
.f4.a1 = cidr_print4,
.f6.a1 = cidr_print6 },
};
@@ -651,11 +811,12 @@ static void usage(const char *prog)
exit(1);
}
-static bool runop(struct cidr *a, char ***arg, int *status)
+static bool runop(char ***arg, int *status)
{
int i;
char *arg1 = **arg;
char *arg2 = *(*arg+1);
+ struct cidr *a = stack;
struct cidr *b = NULL;
if (!arg1)
@@ -745,7 +906,9 @@ int main(int argc, char **argv)
if (!a)
usage(argv[0]);
- while (runop(a, &arg, &status));
+ cidr_push(a);
+
+ while (runop(&arg, &status));
if (*arg)
{
@@ -755,11 +918,13 @@ int main(int argc, char **argv)
if (!printed && (status < 2))
{
- if (a->family == AF_INET)
- cidr_print4(a);
+ if (stack->family == AF_INET)
+ cidr_print4(stack);
else
- cidr_print6(a);
+ cidr_print6(stack);
}
+ qprintf("\n");
+
exit(status);
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-25 05:21:17 +0000