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authorDenis Vlasenko <vda.linux@googlemail.com>2007-12-03 10:45:14 +0000
committerDenis Vlasenko <vda.linux@googlemail.com>2007-12-03 10:45:14 +0000
commit7221c8c22dd527700204eb5cc4d0651af4273f4f (patch)
tree9f45c168efd2a83c7a700dfc2161e9fa2823a222 /networking
parent2bec5139964ebf814ffddbedd526651361be69f8 (diff)
downloadbusybox-7221c8c22dd527700204eb5cc4d0651af4273f4f.tar.gz
lineedit: reduce stack usage
netstat: reduce stack usage; fix handling of NULs in unix socket filenames static.has_inode 1 - -1 do_info 119 116 -3 deinit_S 60 51 -9 unix_do_one 578 451 -127 parse_and_put_prompt 966 825 -141 ------------------------------------------------------------------------------ (add/remove: 0/1 grow/shrink: 0/4 up/down: 0/-281) Total: -281 bytes
Diffstat (limited to 'networking')
-rw-r--r--networking/netstat.c70
1 files changed, 37 insertions, 33 deletions
diff --git a/networking/netstat.c b/networking/netstat.c
index 11f141947..d86c2ff5e 100644
--- a/networking/netstat.c
+++ b/networking/netstat.c
@@ -148,7 +148,7 @@ static char *ip_port_str(struct sockaddr *addr, int port, const char *proto, int
return host_port;
}
-static void tcp_do_one(int lnr, const char *line)
+static void tcp_do_one(int lnr, char *line)
{
char local_addr[64], rem_addr[64];
char more[512];
@@ -201,7 +201,7 @@ static void tcp_do_one(int lnr, const char *line)
}
}
-static void udp_do_one(int lnr, const char *line)
+static void udp_do_one(int lnr, char *line)
{
char local_addr[64], rem_addr[64];
const char *state_str;
@@ -283,7 +283,7 @@ static void udp_do_one(int lnr, const char *line)
}
}
-static void raw_do_one(int lnr, const char *line)
+static void raw_do_one(int lnr, char *line)
{
char local_addr[64], rem_addr[64];
char more[512];
@@ -339,31 +339,37 @@ static void raw_do_one(int lnr, const char *line)
}
}
-static void unix_do_one(int nr, const char *line)
+static void unix_do_one(int nr, char *line)
{
- static smallint has_inode = 0;
-
- char path[PATH_MAX], ss_flags[32];
- const char *ss_proto, *ss_state, *ss_type;
- int num, state, type, inode;
- void *d;
unsigned long refcnt, proto, unix_flags;
+ unsigned long inode;
+ int type, state;
+ int num, path_ofs;
+ void *d;
+ const char *ss_proto, *ss_state, *ss_type;
+ char ss_flags[32];
- if (nr == 0) {
- if (strstr(line, "Inode"))
- has_inode = 1;
- return;
+ if (nr == 0)
+ return; /* skip header */
+
+ {
+ char *last = last_char_is(line, '\n');
+ if (last)
+ *last = '\0';
}
- path[0] = '\0';
- num = sscanf(line, "%p: %lX %lX %lX %X %X %d %s",
- &d, &refcnt, &proto, &unix_flags, &type, &state, &inode, path);
- if (num < 6) {
- bb_error_msg("warning, got bogus unix line");
+
+ /* 2.6.15 may report lines like "... @/tmp/fam-user-^@^@^@^@^@^@^@..."
+ * (those ^@ are NUL bytes). fgets sees them as tons of empty lines. */
+ if (!line[0])
return;
- }
- if (!has_inode)
- sprintf(path, "%d", inode);
+ path_ofs = 0; /* paranoia */
+ num = sscanf(line, "%p: %lX %lX %lX %X %X %lu %n",
+ &d, &refcnt, &proto, &unix_flags, &type, &state, &inode, &path_ofs);
+ if (num < 7) {
+ bb_error_msg("got bogus unix line '%s'", line);
+ return;
+ }
if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) != (NETSTAT_LISTENING|NETSTAT_CONNECTED)) {
if ((state == SS_UNCONNECTED) && (unix_flags & SO_ACCEPTCON)) {
if (!(flags & NETSTAT_LISTENING))
@@ -439,13 +445,9 @@ static void unix_do_one(int nr, const char *line)
strcat(ss_flags, "N ");
strcat(ss_flags, "]");
- printf("%-5s %-6ld %-11s %-10s %-13s ",
- ss_proto, refcnt, ss_flags, ss_type, ss_state);
- if (has_inode)
- printf("%-6d ", inode);
- else
- printf("- ");
- puts(path);
+ printf("%-5s %-6ld %-11s %-10s %-13s %6lu %s\n",
+ ss_proto, refcnt, ss_flags, ss_type, ss_state, inode,
+ line + path_ofs);
}
#define _PATH_PROCNET_UDP "/proc/net/udp"
@@ -456,10 +458,11 @@ static void unix_do_one(int nr, const char *line)
#define _PATH_PROCNET_RAW6 "/proc/net/raw6"
#define _PATH_PROCNET_UNIX "/proc/net/unix"
-static void do_info(const char *file, const char *name, void (*proc)(int, const char *))
+static void do_info(const char *file, const char *name, void (*proc)(int, char *))
{
- int lnr = 0;
+ int lnr;
FILE *procinfo;
+ char *buffer;
procinfo = fopen(file, "r");
if (procinfo == NULL) {
@@ -470,13 +473,14 @@ static void do_info(const char *file, const char *name, void (*proc)(int, const
}
return;
}
+ lnr = 0;
do {
- char *buffer = xmalloc_fgets(procinfo);
+ buffer = xmalloc_fgets(procinfo);
if (buffer) {
(proc)(lnr++, buffer);
free(buffer);
}
- } while (!feof(procinfo));
+ } while (buffer);
fclose(procinfo);
}