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traceroute: code shrink

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Do not pass "from" and "to" addresses as parameters, keep them in globals

function                                             old     new   delta
common_traceroute_main                              3426    3391     -35

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2020-12-12 17:45:49 +01:00
parent d0dea17900
commit 70726640b3
1 changed files with 35 additions and 49 deletions
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84
networking/traceroute.c
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@ -389,6 +389,8 @@ struct globals {
struct outdata_t *outdata;
len_and_sockaddr *dest_lsa;
len_and_sockaddr *from_lsa; /* response came from this address */
struct sockaddr *to; /* response came to this (local) address */
int packlen; /* total length of packet */
int pmtu; /* Path MTU Discovery (RFC1191) */
uint32_t ident;
@ -442,7 +444,7 @@ struct globals {
*/
static int
wait_for_reply(len_and_sockaddr *from_lsa, struct sockaddr *to, unsigned *timestamp_us, int *left_ms)
wait_for_reply(unsigned *timestamp_us, int *left_ms)
{
struct pollfd pfd[1];
int read_len = 0;
@ -455,7 +457,7 @@ wait_for_reply(len_and_sockaddr *from_lsa, struct sockaddr *to, unsigned *timest
read_len = recv_from_to(rcvsock,
recv_pkt, sizeof(recv_pkt),
/*flags:*/ MSG_DONTWAIT,
&from_lsa->u.sa, to, from_lsa->len);
&G.from_lsa->u.sa, G.to, G.from_lsa->len);
t = monotonic_us();
*left_ms -= (t - *timestamp_us) / 1000;
*timestamp_us = t;
@ -598,7 +600,7 @@ pr_type(unsigned char t)
packet4_ok(read_len, seq)
#endif
static int
packet4_ok(int read_len, const struct sockaddr_in *from, int seq)
packet4_ok(int read_len, int seq)
{
const struct icmp *icp;
unsigned char type, code;
@ -616,7 +618,7 @@ packet4_ok(int read_len, const struct sockaddr_in *from, int seq)
#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
if (verbose)
printf("packet too short (%d bytes) from %s\n", read_len,
inet_ntoa(from->sin_addr));
inet_ntoa(G.from_lsa->u.sin.sin_addr));
#endif
return 0;
}
@ -680,7 +682,7 @@ packet4_ok(int read_len, const struct sockaddr_in *from, int seq)
uint32_t *lp = (uint32_t *)&icp->icmp_ip;
printf("\n%d bytes from %s",
read_len, inet_ntoa(from->sin_addr));
read_len, inet_ntoa(G.from_lsa->u.sin.sin_addr));
/* Two separate printf() because inet_ntoa() returns static string */
printf(" to %s: icmp type %d (%s) code %d\n",
inet_ntoa(ip->ip_dst),
@ -694,14 +696,8 @@ packet4_ok(int read_len, const struct sockaddr_in *from, int seq)
#if ENABLE_TRACEROUTE6
# if !ENABLE_FEATURE_TRACEROUTE_VERBOSE
#define packet6_ok(read_len, from_lsa, to, seq) \
packet6_ok(read_len, from_lsa, seq)
# endif
static int
packet6_ok(int read_len, const struct sockaddr_in6 *from,
struct sockaddr *to,
int seq)
packet6_ok(int read_len, int seq)
{
const struct icmp6_hdr *icp;
unsigned char type, code;
@ -757,21 +753,18 @@ packet6_ok(int read_len, const struct sockaddr_in6 *from,
# if ENABLE_FEATURE_TRACEROUTE_VERBOSE
if (verbose) {
# ifndef MAXHOSTNAMELEN
# define MAXHOSTNAMELEN 80
# endif
unsigned char *p;
char pa[MAXHOSTNAMELEN];
char pa[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff") + 4];
int i;
p = (unsigned char *) (icp + 1);
printf("\n%d bytes from %s",
read_len,
inet_ntop(AF_INET6, &from->sin6_addr, pa, sizeof(pa)));
inet_ntop(AF_INET6, &G.from_lsa->u.sin6.sin6_addr, pa, sizeof(pa)));
/* Two printf() instead of one - reuse string constants */
printf(" to %s: icmp type %d (%s) code %d\n",
inet_ntop(AF_INET6, &((struct sockaddr_in6*)to)->sin6_addr, pa, sizeof(pa)),
inet_ntop(AF_INET6, &((struct sockaddr_in6*)G.to)->sin6_addr, pa, sizeof(pa)),
type, pr_type(type), icp->icmp6_code);
read_len -= sizeof(struct icmp6_hdr);
@ -790,29 +783,21 @@ packet6_ok(int read_len, const struct sockaddr_in6 *from,
return 0;
}
# if !ENABLE_FEATURE_TRACEROUTE_VERBOSE
#define packet_ok(read_len, from_lsa, to, seq) \
packet_ok(read_len, from_lsa, seq)
# endif
static int
packet_ok(int read_len, len_and_sockaddr *from_lsa,
struct sockaddr *to,
int seq)
packet_ok(int read_len, int seq)
{
if (from_lsa->u.sa.sa_family == AF_INET)
return packet4_ok(read_len, &from_lsa->u.sin, seq);
return packet6_ok(read_len, &from_lsa->u.sin6, to, seq);
if (G.from_lsa->u.sa.sa_family == AF_INET)
return packet4_ok(read_len, seq);
return packet6_ok(read_len, seq);
}
#else /* !ENABLE_TRACEROUTE6 */
static ALWAYS_INLINE int
packet_ok(int read_len,
len_and_sockaddr *from_lsa IF_NOT_FEATURE_TRACEROUTE_VERBOSE(UNUSED_PARAM),
struct sockaddr *to UNUSED_PARAM,
int seq)
packet_ok(int read_len, int seq)
{
return packet4_ok(read_len, &from_lsa->u.sin, seq);
return packet4_ok(read_len, seq);
}
#endif
@ -845,19 +830,19 @@ print_inetname(const struct sockaddr *from)
}
static void
print(int read_len, const struct sockaddr *from, const struct sockaddr *to)
print(int read_len)
{
print_inetname(from);
print_inetname(&G.from_lsa->u.sa);
if (verbose) {
char *ina = xmalloc_sockaddr2dotted_noport(to);
char *ina = xmalloc_sockaddr2dotted_noport(G.to);
#if ENABLE_TRACEROUTE6
/* NB: reads from (AF_INET, SOCK_RAW, IPPROTO_ICMP) socket
* return the entire IP packet (IOW: they do not strip IP header).
* Reads from (AF_INET6, SOCK_RAW, IPPROTO_ICMPV6) do strip IPv6
* header and return only ICMP6 packet. Weird.
*/
if (to->sa_family == AF_INET6) {
if (G.to->sa_family == AF_INET6) {
/* read_len -= sizeof(struct ip6_hdr); - WRONG! */
} else
#endif
@ -910,9 +895,7 @@ common_traceroute_main(int op, char **argv)
#endif
int ttl;
int seq;
len_and_sockaddr *from_lsa;
struct sockaddr *lastaddr;
struct sockaddr *to;
/* Ensure the socket fds won't be 0, 1 or 2 */
bb_sanitize_stdio();
@ -1121,9 +1104,9 @@ common_traceroute_main(int op, char **argv)
printf(" from %s", source);
printf(", %d hops max, %d byte packets\n", max_ttl, packlen);
from_lsa = xmemdup(dest_lsa, LSA_LEN_SIZE + dest_lsa->len);
lastaddr = xzalloc(dest_lsa->len);
to = xzalloc(dest_lsa->len);
G.from_lsa = xmemdup(dest_lsa, LSA_LEN_SIZE + dest_lsa->len);
G.to = xzalloc(dest_lsa->len);
seq = 0;
for (ttl = first_ttl; ttl <= max_ttl; ++ttl) {
int probe;
@ -1146,7 +1129,10 @@ common_traceroute_main(int op, char **argv)
t2 = t1 = monotonic_us();
left_ms = waittime * 1000;
while ((read_len = wait_for_reply(from_lsa, to, &t2, &left_ms)) != 0) {
/* NB: wait_for_reply() fills "G.from_lsa" and "G.to"
* with "where it came from" and "to which local address it arrived".
*/
while ((read_len = wait_for_reply(&t2, &left_ms)) != 0) {
int icmp_code;
/* Recv'ed a packet, or read error */
@ -1154,22 +1140,22 @@ common_traceroute_main(int op, char **argv)
if (read_len < 0)
continue;
icmp_code = packet_ok(read_len, from_lsa, to, seq);
icmp_code = packet_ok(read_len, seq);
/* Skip short packet */
if (icmp_code == 0)
continue;
if (!gotlastaddr
|| (memcmp(lastaddr, &from_lsa->u.sa, from_lsa->len) != 0)
|| (memcmp(lastaddr, &G.from_lsa->u.sa, G.from_lsa->len) != 0)
) {
print(read_len, &from_lsa->u.sa, to);
memcpy(lastaddr, &from_lsa->u.sa, from_lsa->len);
print(read_len);
memcpy(lastaddr, &G.from_lsa->u.sa, G.from_lsa->len);
gotlastaddr = 1;
}
print_delta_ms(t1, t2);
if (from_lsa->u.sa.sa_family == AF_INET) {
if (G.from_lsa->u.sa.sa_family == AF_INET) {
if (op & OPT_TTL_FLAG) {
struct ip *ip = (struct ip *)recv_pkt;
printf(" (%d)", ip->ip_ttl);
@ -1276,9 +1262,9 @@ common_traceroute_main(int op, char **argv)
}
if (ENABLE_FEATURE_CLEAN_UP) {
free(to);
free(G.to);
free(lastaddr);
free(from_lsa);
free(G.from_lsa);
}
return 0;