The -a command line option can take either an address prefix, or a bare
address. Current parsing of this is pretty awkward, using the special
purpose helper inany_prefix_pton(). With the new incremental parsing
helpers this can be done more naturally. Rework it to use them.
This does requiring extending parse_inany() to parse_inany_() which also
reports the format of the address as parse, as opposed to the family of
the resulting address. This is so that ::ffff:192.0.1.1/112 will be
correctly interpreted the same as 192.0.1.1/16, rather than the
nonsensical 192.0.0.1/112.
Cc: Jon Maloy
Signed-off-by: David Gibson
---
Makefile | 1 -
conf.c | 57 +++++++++++++++++++++++++++++++++++++-------------------
inany.c | 50 -------------------------------------------------
inany.h | 2 --
parse.c | 17 ++++++++++++++---
parse.h | 5 ++++-
6 files changed, 56 insertions(+), 76 deletions(-)
diff --git a/Makefile b/Makefile
index e2b22ddf..5757aeff 100644
--- a/Makefile
+++ b/Makefile
@@ -223,7 +223,6 @@ passt-repair.cppcheck: $(PASST_REPAIR_SRCS) $(PASST_REPAIR_HEADERS) seccomp_repa
pesto.cppcheck: BASE_CPPFLAGS += -DPESTO
pesto.cppcheck: CPPCHECK_FLAGS += --suppress=unusedFunction:bitmap.c
pesto.cppcheck: CPPCHECK_FLAGS += --suppress=unusedFunction:inany.h
-pesto.cppcheck: CPPCHECK_FLAGS += --suppress=unusedFunction:inany.c
pesto.cppcheck: CPPCHECK_FLAGS += --suppress=unusedFunction:ip.h
pesto.cppcheck: CPPCHECK_FLAGS += --suppress=unusedFunction:serialise.c
pesto.cppcheck: CPPCHECK_FLAGS += --suppress=staticFunction:fwd_rule.c
diff --git a/conf.c b/conf.c
index d1889e0c..c4a36dee 100644
--- a/conf.c
+++ b/conf.c
@@ -1176,31 +1176,45 @@ int conf_tap_fd(const char *arg)
*/
static bool conf_addr(struct ctx *c, char *arg, uint8_t opt_n)
{
+ unsigned long prefix_len;
+ const struct in_addr *a4;
union inany_addr addr;
+ sa_family_t parse_af;
const char *p = arg;
- uint8_t prefix_len;
bool is_prefix;
- is_prefix = inany_prefix_pton(arg, &addr, &prefix_len);
-
- if (is_prefix && opt_n)
- die("Redundant prefix length specification");
-
- if (!is_prefix &&
- !(parse_inany(&p, &addr) && parse_eoi(p)))
- die("Invalid address: %s", arg);
-
- if (opt_n && inany_v4(&addr))
- prefix_len = opt_n;
- else if (!is_prefix)
- prefix_len = inany_default_prefix_len(&addr);
+ if (!parse_inany_(&p, &addr, &parse_af))
+ goto bad;
+ a4 = inany_v4(&addr);
+
+ if ((is_prefix = parse_literal(&p, "/"))) {
+ /* Prefix length included in -a option */
+ if (!parse_unsigned(&p, 10, &prefix_len))
+ goto bad;
+ if (opt_n)
+ die("Redundant prefix length specification");
+ if (parse_af == AF_INET) {
+ if (prefix_len > 32)
+ goto bad_prefix;
+ prefix_len += 96;
+ } else if (prefix_len > 128) {
+ goto bad_prefix;
+ }
+ } else {
+ /* Get prefix length from elsewhere */
+ if (opt_n && a4)
+ prefix_len = opt_n;
+ else
+ prefix_len = inany_default_prefix_len(&addr);
+ }
- if (inany_is_unspecified(&addr) || inany_is_multicast(&addr) ||
- inany_is_loopback(&addr) || IN6_IS_ADDR_V4COMPAT(&addr.a6))
- die("Invalid address: %s", arg);
+ if (!parse_eoi(p) ||
+ !inany_is_unicast(&addr) ||
+ inany_is_loopback(&addr))
+ goto bad;
- if (inany_v4(&addr)) {
- c->ip4.addr = *inany_v4(&addr);
+ if (a4) {
+ c->ip4.addr = *a4;
c->ip4.prefix_len = prefix_len - 96;
c->ip4.addr_fixed = true;
c->ip4.no_copy_addrs = true;
@@ -1211,6 +1225,11 @@ static bool conf_addr(struct ctx *c, char *arg, uint8_t opt_n)
}
return is_prefix;
+
+bad_prefix:
+ die("Invalid prefix length: %s", arg);
+bad:
+ die("Invalid guest address: %s", arg);
}
/**
diff --git a/inany.c b/inany.c
index 154f08b5..120c9387 100644
--- a/inany.c
+++ b/inany.c
@@ -70,53 +70,3 @@ const char *inany_ntop(const union inany_addr *src, char *dst, socklen_t size)
return inet_ntop(AF_INET6, &src->a6, dst, size);
}
-
-/**
- * inany_prefix_pton() - Parse an IPv[46] address with prefix length
- * @src: IPv[46] address and prefix length string in CIDR format
- * @dst: Output buffer, filled with parsed address
- * @prefix_len: Prefix length, to be filled in IPv6 format
- *
- * Return: 1 on success, 0 if no parseable address or prefix is found
- */
-int inany_prefix_pton(const char *src, union inany_addr *dst,
- uint8_t *prefix_len)
-{
- char astr[INANY_ADDRSTRLEN] = { 0 };
- size_t alen = strcspn(src, "/");
- const char *pstr = &src[alen + 1];
- const char *p = astr;
- unsigned long plen;
- char *end;
-
- if (alen >= INANY_ADDRSTRLEN)
- return 0;
-
- if (src[alen] != '/')
- return 0;
-
- strncpy(astr, src, alen);
-
- /* Read prefix length */
- errno = 0;
- plen = strtoul(pstr, &end, 10);
- if (errno || *end || plen > 128)
- return 0;
-
- /* Read address */
- if (inet_pton(AF_INET6, astr, dst)) {
- if (inany_v4(dst) && plen < 96)
- return 0;
- *prefix_len = plen;
- return 1;
- }
-
- if (parse_inany(&p, dst) && parse_eoi(p)) {
- if (plen > 32)
- return 0;
- *prefix_len = plen + 96;
- return 1;
- }
-
- return 0;
-}
diff --git a/inany.h b/inany.h
index 93d98368..5b176ccf 100644
--- a/inany.h
+++ b/inany.h
@@ -303,7 +303,5 @@ static inline int inany_from_sockaddr(union inany_addr *dst, in_port_t *port,
bool inany_matches(const union inany_addr *a, const union inany_addr *b);
const char *inany_ntop(const union inany_addr *src, char *dst, socklen_t size);
-int inany_prefix_pton(const char *src, union inany_addr *dst,
- uint8_t *prefix_len);
#endif /* INANY_H */
diff --git a/parse.c b/parse.c
index c8d3a9b0..24178873 100644
--- a/parse.c
+++ b/parse.c
@@ -185,18 +185,29 @@ static bool parse_ipv6(const char **cursor, struct in6_addr *abuf)
}
/**
- * parse_inany() - Parse an IPv4 or IPv6 address from a string
+ * parse_inany_() - Parse an IPv4 or IPv6 address from a string
* @addr: On success, updated with parsed address
+ * @parse_af: On success, updated with the format of the parsed address
+ *
+ * @parseaf is updated to reflect the string format, not the final address
+ * family. So "::ffff:192.0.1.1", will set @parseaf to AF_INET6, despite being
+ * a IPv4-mapped address.
*/
-bool parse_inany(const char **cursor, union inany_addr *addr)
+bool parse_inany_(const char **cursor, union inany_addr *addr,
+ sa_family_t *parse_af)
{
struct in_addr a4;
- if (parse_ipv6(cursor, &addr->a6))
+ if (parse_ipv6(cursor, &addr->a6)) {
+ if (parse_af)
+ *parse_af = AF_INET6;
return true;
+ }
if (parse_ipv4(cursor, &a4)) {
*addr = inany_from_v4(a4);
+ if (parse_af)
+ *parse_af = AF_INET;
return true;
}
diff --git a/parse.h b/parse.h
index 2820a065..ab1d5adb 100644
--- a/parse.h
+++ b/parse.h
@@ -27,6 +27,9 @@ bool parse_eoi(const char *cursor);
bool parse_unsigned(const char **cursor, int base, unsigned long *valp);
bool parse_port_range(const char **cursor, struct port_range *range);
bool parse_ipv4(const char **cursor, struct in_addr *abuf);
-bool parse_inany(const char **cursor, union inany_addr *addr);
+bool parse_inany_(const char **cursor, union inany_addr *addr,
+ sa_family_t *parse_af);
+
+#define parse_inany(cursor, addr) parse_inany_((cursor), (addr), NULL)
#endif /* _PARSE_H */
--
2.54.0