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authorDenis Vlasenko2009-04-21 23:48:38 +0000
committerDenis Vlasenko2009-04-21 23:48:38 +0000
commita771e7c0057d0f506f8cdf67be39268e1c9f0735 (patch)
treebef7afb1304b3510d4857148a50e162a0578c363
parente6b10ef0a7a5761c4cd0fe5f48bad953aa92240e (diff)
downloadbusybox-a771e7c0057d0f506f8cdf67be39268e1c9f0735.zip
busybox-a771e7c0057d0f506f8cdf67be39268e1c9f0735.tar.gz
*: remove check for errors on getsockaddr in cases we know they can't happen
libbb: make get_sock_lsa use only one getsockaddr syscall, not two function old new delta get_sock_lsa 72 101 +29 do_iplink 1151 1137 -14 arping_main 1585 1569 -16 dolisten 789 755 -34 xrtnl_open 161 94 -67
-rw-r--r--libbb/xconnect.c21
-rw-r--r--networking/arping.c15
-rw-r--r--networking/libiproute/iplink.c8
-rw-r--r--networking/libiproute/libnetlink.c9
-rw-r--r--networking/libiproute/libnetlink.h3
-rw-r--r--networking/nc_bloaty.c12
6 files changed, 37 insertions, 31 deletions
diff --git a/libbb/xconnect.c b/libbb/xconnect.c
index 1b4f4f7..f853e95 100644
--- a/libbb/xconnect.c
+++ b/libbb/xconnect.c
@@ -37,16 +37,21 @@ int FAST_FUNC setsockopt_bindtodevice(int fd, const char *iface)
len_and_sockaddr* FAST_FUNC get_sock_lsa(int fd)
{
- len_and_sockaddr *lsa;
- socklen_t len = 0;
+ len_and_sockaddr lsa;
+ len_and_sockaddr *lsa_ptr;
- /* Can be optimized to do only one getsockname() */
- if (getsockname(fd, NULL, &len) != 0)
+ lsa.len = LSA_SIZEOF_SA;
+ if (getsockname(fd, &lsa.u.sa, &lsa.len) != 0)
return NULL;
- lsa = xzalloc(LSA_LEN_SIZE + len);
- lsa->len = len;
- getsockname(fd, &lsa->u.sa, &lsa->len);
- return lsa;
+
+ lsa_ptr = xzalloc(LSA_LEN_SIZE + lsa.len);
+ if (lsa.len > LSA_SIZEOF_SA) { /* rarely (if ever) happens */
+ lsa_ptr->len = lsa.len;
+ getsockname(fd, &lsa_ptr->u.sa, &lsa_ptr->len);
+ } else {
+ memcpy(lsa_ptr, &lsa, LSA_LEN_SIZE + lsa.len);
+ }
+ return lsa_ptr;
}
void FAST_FUNC xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen)
diff --git a/networking/arping.c b/networking/arping.c
index 915af32..ab39c71 100644
--- a/networking/arping.c
+++ b/networking/arping.c
@@ -348,9 +348,10 @@ int arping_main(int argc UNUSED_PARAM, char **argv)
if (setsockopt(probe_fd, SOL_SOCKET, SO_DONTROUTE, &const_int_1, sizeof(const_int_1)) == -1)
bb_perror_msg("setsockopt(SO_DONTROUTE)");
xconnect(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr));
- if (getsockname(probe_fd, (struct sockaddr *) &saddr, &alen) == -1) {
- bb_perror_msg_and_die("getsockname");
- }
+ getsockname(probe_fd, (struct sockaddr *) &saddr, &alen);
+ //never happens:
+ //if (getsockname(probe_fd, (struct sockaddr *) &saddr, &alen) == -1)
+ // bb_perror_msg_and_die("getsockname");
if (saddr.sin_family != AF_INET)
bb_error_msg_and_die("no IP address configured");
src = saddr.sin_addr;
@@ -365,10 +366,10 @@ int arping_main(int argc UNUSED_PARAM, char **argv)
{
socklen_t alen = sizeof(me);
-
- if (getsockname(sock_fd, (struct sockaddr *) &me, &alen) == -1) {
- bb_perror_msg_and_die("getsockname");
- }
+ getsockname(sock_fd, (struct sockaddr *) &me, &alen);
+ //never happens:
+ //if (getsockname(sock_fd, (struct sockaddr *) &me, &alen) == -1)
+ // bb_perror_msg_and_die("getsockname");
}
if (me.sll_halen == 0) {
bb_error_msg(err_str, "is not ARPable (no ll address)");
diff --git a/networking/libiproute/iplink.c b/networking/libiproute/iplink.c
index 1e7ee07..de7d640 100644
--- a/networking/libiproute/iplink.c
+++ b/networking/libiproute/iplink.c
@@ -112,11 +112,11 @@ static int get_address(char *dev, int *htype)
me.sll_ifindex = ifr.ifr_ifindex;
me.sll_protocol = htons(ETH_P_LOOP);
xbind(s, (struct sockaddr*)&me, sizeof(me));
-
alen = sizeof(me);
- if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
- bb_perror_msg_and_die("getsockname");
- }
+ getsockname(s, (struct sockaddr*)&me, &alen);
+ //never happens:
+ //if (getsockname(s, (struct sockaddr*)&me, &alen) == -1)
+ // bb_perror_msg_and_die("getsockname");
close(s);
*htype = me.sll_hatype;
return me.sll_halen;
diff --git a/networking/libiproute/libnetlink.c b/networking/libiproute/libnetlink.c
index 6d51d8d..7ad2de9 100644
--- a/networking/libiproute/libnetlink.c
+++ b/networking/libiproute/libnetlink.c
@@ -26,22 +26,23 @@ int FAST_FUNC xrtnl_open(struct rtnl_handle *rth/*, unsigned subscriptions*/)
{
socklen_t addr_len;
- memset(rth, 0, sizeof(rth));
-
+ memset(rth, 0, sizeof(*rth));
rth->fd = xsocket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
-
- memset(&rth->local, 0, sizeof(rth->local));
rth->local.nl_family = AF_NETLINK;
/*rth->local.nl_groups = subscriptions;*/
xbind(rth->fd, (struct sockaddr*)&rth->local, sizeof(rth->local));
addr_len = sizeof(rth->local);
+ getsockname(rth->fd, (struct sockaddr*)&rth->local, &addr_len);
+
+/* too much paranoia
if (getsockname(rth->fd, (struct sockaddr*)&rth->local, &addr_len) < 0)
bb_perror_msg_and_die("getsockname");
if (addr_len != sizeof(rth->local))
bb_error_msg_and_die("wrong address length %d", addr_len);
if (rth->local.nl_family != AF_NETLINK)
bb_error_msg_and_die("wrong address family %d", rth->local.nl_family);
+*/
rth->seq = time(NULL);
return 0;
}
diff --git a/networking/libiproute/libnetlink.h b/networking/libiproute/libnetlink.h
index e5fee4d..11a4a10 100644
--- a/networking/libiproute/libnetlink.h
+++ b/networking/libiproute/libnetlink.h
@@ -10,8 +10,7 @@
PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
-struct rtnl_handle
-{
+struct rtnl_handle {
int fd;
struct sockaddr_nl local;
struct sockaddr_nl peer;
diff --git a/networking/nc_bloaty.c b/networking/nc_bloaty.c
index 47940e9..efe831e 100644
--- a/networking/nc_bloaty.c
+++ b/networking/nc_bloaty.c
@@ -278,9 +278,9 @@ static void dolisten(void)
random unknown port is probably not very useful without "netstat". */
if (o_verbose) {
char *addr;
- rr = getsockname(netfd, &ouraddr->u.sa, &ouraddr->len);
- if (rr < 0)
- bb_perror_msg_and_die("getsockname after bind");
+ getsockname(netfd, &ouraddr->u.sa, &ouraddr->len);
+ //if (rr < 0)
+ // bb_perror_msg_and_die("getsockname after bind");
addr = xmalloc_sockaddr2dotted(&ouraddr->u.sa);
fprintf(stderr, "listening on %s ...\n", addr);
free(addr);
@@ -359,9 +359,9 @@ create new one, and bind() it. TODO */
doing a listen-on-any on a multihomed machine. This allows one to
offer different services via different alias addresses, such as the
"virtual web site" hack. */
- rr = getsockname(netfd, &ouraddr->u.sa, &ouraddr->len);
- if (rr < 0)
- bb_perror_msg_and_die("getsockname after accept");
+ getsockname(netfd, &ouraddr->u.sa, &ouraddr->len);
+ //if (rr < 0)
+ // bb_perror_msg_and_die("getsockname after accept");
}
if (o_verbose) {