[PATCH 6/8] Treat port numbers as unsigned

[David Gibson <david@gibson.dropbear.id.au>]

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Port numbers are unsigned values, but we're storing them in (signed) int
variables in some places.  This isn't actually harmful, because int is
large enough to hold the entire range of ports.  However in places we don't
want to use an in_port_t (usually to avoid overflow on the last iteration
of a loop) it makes more conceptual sense to use an unsigned int. This will
also avoid some problems with later cleanups.

Signed-off-by: David Gibson <david(a)gibson.dropbear.id.au>
---
 conf.c | 11 ++++++-----
 tcp.c  |  4 ++--
 udp.c  |  2 +-
 3 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/conf.c b/conf.c
index 2cbc519..503d894 100644
--- a/conf.c
+++ b/conf.c
@@ -118,11 +118,12 @@ static int get_bound_ports_ns(void *arg)
 static int conf_ports(const struct ctx *c, char optname, const char *optarg,
 		      struct port_fwd *fwd)
 {
-	int start_src, end_src, start_dst, end_dst, exclude_only = 1, i, port;
 	char addr_buf[sizeof(struct in6_addr)] = { 0 }, *addr = addr_buf;
+	int start_src, end_src, start_dst, end_dst, exclude_only = 1, i;
 	char buf[BUFSIZ], *sep, *spec, *p;
 	port_fwd_map exclude = { 0 };
 	sa_family_t af = AF_UNSPEC;
+	unsigned port;
 
 	if (!strcmp(optarg, "none")) {
 		if (fwd->mode)
@@ -204,11 +205,11 @@ static int conf_ports(const struct ctx *c, char optname, const char *optarg,
 			p++;
 
 		errno = 0;
-		port = strtol(p, &sep, 10);
+		port = strtoul(p, &sep, 10);
 		if (sep == p)
 			break;
 
-		if (port < 0 || port > USHRT_MAX || errno)
+		if (port > USHRT_MAX || errno)
 			goto bad;
 
 		switch (*sep) {
@@ -271,11 +272,11 @@ static int conf_ports(const struct ctx *c, char optname, const char *optarg,
 			break;
 
 		errno = 0;
-		port = strtol(p, &sep, 10);
+		port = strtoul(p, &sep, 10);
 		if (sep == p)
 			break;
 
-		if (port < 0 || port > USHRT_MAX || errno)
+		if (port > USHRT_MAX || errno)
 			goto bad;
 
 		/* -p 22
diff --git a/tcp.c b/tcp.c
index 509a0b3..d96232c 100644
--- a/tcp.c
+++ b/tcp.c
@@ -3182,7 +3182,7 @@ void tcp_sock_init(const struct ctx *c, int ns, sa_family_t af,
 static int tcp_sock_init_ns(void *arg)
 {
 	struct ctx *c = (struct ctx *)arg;
-	int port;
+	unsigned port;
 
 	ns_enter(c);
 
@@ -3381,7 +3381,7 @@ struct tcp_port_rebind_arg {
 static int tcp_port_rebind(void *arg)
 {
 	struct tcp_port_rebind_arg *a = (struct tcp_port_rebind_arg *)arg;
-	int port;
+	unsigned port;
 
 	if (a->bind_in_ns) {
 		ns_enter(a->c);
diff --git a/udp.c b/udp.c
index d17b3b4..27c3aa3 100644
--- a/udp.c
+++ b/udp.c
@@ -1193,7 +1193,7 @@ void udp_sock_init(const struct ctx *c, int ns, sa_family_t af,
 int udp_sock_init_ns(void *arg)
 {
 	struct ctx *c = (struct ctx *)arg;
-	int dst;
+	unsigned dst;
 
 	if (ns_enter(c))
 		return 0;
-- 
@@ -1193,7 +1193,7 @@ void udp_sock_init(const struct ctx *c, int ns, sa_family_t af,
 int udp_sock_init_ns(void *arg)
 {
 	struct ctx *c = (struct ctx *)arg;
-	int dst;
+	unsigned dst;
 
 	if (ns_enter(c))
 		return 0;
-- 
2.37.3