The handling of the -a option is getting complex enough that it's pretty
bulky inside it's switch label. Move it into a new conf_addr() function.
We also rename the bulky addr_has_prefix_len and prefix_len_from_opt
variables to the terser 'opt_a_is_prefix' and 'opt_n', since they are
specifically about those command line options.
Cc: Jon Maloy
Signed-off-by: David Gibson
---
conf.c | 96 ++++++++++++++++++++++++++++++++--------------------------
1 file changed, 53 insertions(+), 43 deletions(-)
diff --git a/conf.c b/conf.c
index 2d1895d4..3614776c 100644
--- a/conf.c
+++ b/conf.c
@@ -1168,6 +1168,53 @@ int conf_tap_fd(const char *arg)
return val;
}
+/**
+ * conf_addr() - Configure guest address with -a option
+ * @c: Execution context
+ * @arg: -a command line argument
+ * @opt_n: Value from -n option, if any
+ */
+static bool conf_addr(struct ctx *c, char *arg, uint8_t opt_n)
+{
+ union inany_addr addr;
+ 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 (inany_is_unspecified(&addr) || inany_is_multicast(&addr) ||
+ inany_is_loopback(&addr) || IN6_IS_ADDR_V4COMPAT(&addr.a6))
+ die("Invalid address: %s", arg);
+
+ if (inany_v4(&addr)) {
+ c->ip4.addr = *inany_v4(&addr);
+ c->ip4.prefix_len = prefix_len - 96;
+ c->ip4.addr_fixed = true;
+ if (c->mode == MODE_PASTA)
+ c->ip4.no_copy_addrs = true;
+ } else {
+ c->ip6.addr = addr.a6;
+ c->ip6.addr_fixed = true;
+ if (c->mode == MODE_PASTA)
+ c->ip6.no_copy_addrs = true;
+ }
+
+ return is_prefix;
+}
+
/**
* conf() - Process command-line arguments and set configuration
* @c: Execution context
@@ -1262,12 +1309,12 @@ void conf(struct ctx *c, int argc, char **argv)
unsigned dns4_idx = 0, dns6_idx = 0;
unsigned long max_mtu = IP_MAX_MTU;
struct fqdn *dnss = c->dns_search;
- bool addr_has_prefix_len = false;
- uint8_t prefix_len_from_opt = 0;
unsigned int ifi4 = 0, ifi6 = 0;
+ bool opt_a_is_prefix = false;
const char *logfile = NULL;
char *runas = NULL;
size_t logsize = 0;
+ uint8_t opt_n = 0;
int name, ret;
uid_t uid;
gid_t gid;
@@ -1567,52 +1614,15 @@ void conf(struct ctx *c, int argc, char **argv)
c->mtu = mtu;
break;
}
- case 'a': {
- union inany_addr addr;
- uint8_t prefix_len;
-
- addr_has_prefix_len = inany_prefix_pton(optarg, &addr,
- &prefix_len);
-
- if (addr_has_prefix_len && prefix_len_from_opt)
- die("Redundant prefix length specification");
-
- p = optarg;
- if (!addr_has_prefix_len &&
- !(parse_inany(&p, &addr) && parse_eoi(p)))
- die("Invalid address: %s", optarg);
-
- if (prefix_len_from_opt && inany_v4(&addr))
- prefix_len = prefix_len_from_opt;
- else if (!addr_has_prefix_len)
- 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", optarg);
-
- if (inany_v4(&addr)) {
- c->ip4.addr = *inany_v4(&addr);
- c->ip4.prefix_len = prefix_len - 96;
- c->ip4.addr_fixed = true;
- if (c->mode == MODE_PASTA)
- c->ip4.no_copy_addrs = true;
- } else {
- c->ip6.addr = addr.a6;
- c->ip6.addr_fixed = true;
- if (c->mode == MODE_PASTA)
- c->ip6.no_copy_addrs = true;
- }
+ case 'a':
+ opt_a_is_prefix = conf_addr(c, optarg, opt_n);
break;
- }
case 'n':
- if (addr_has_prefix_len)
+ if (opt_a_is_prefix)
die("Redundant prefix length specification");
c->ip4.prefix_len = conf_ip4_prefix(optarg);
- prefix_len_from_opt = c->ip4.prefix_len + 96;
+ opt_n = c->ip4.prefix_len + 96;
break;
case 'M':
parse_mac(c->our_tap_mac, optarg);
--
2.54.0