From abee3d0e0dc7c7e4b733b0145c56bf8159a37a69 Mon Sep 17 00:00:00 2001 From: Denis Vlasenko Date: Wed, 26 Dec 2007 20:44:45 +0000 Subject: Fix xmalloc_fgets_str so that it really does NOT strip terminator. Add xmalloc_fgetline_str which does strip terminator, and use it in dpkg instead of xmalloc_fgets_str. netstat: use xmalloc_fgets_str - allows to eat strings with NULs (this fixes bug with some weird /proc/net/unix input) function old new delta xmalloc_fgets_internal - 191 +191 xmalloc_fgetline_str - 18 +18 do_info 116 120 +4 unix_do_one 451 447 -4 tcp_do_one 423 419 -4 send_tree 369 365 -4 xmalloc_fgets_str 178 15 -163 ------------------------------------------------------------------------------ (add/remove: 2/0 grow/shrink: 1/4 up/down: 213/-175) Total: 38 bytes text data bss dec hex filename 778445 832 7344 786621 c00bd busybox_old 778483 832 7344 786659 c00e3 busybox_unstripped --- networking/netstat.c | 37 +++++++++++++++---------------------- 1 file changed, 15 insertions(+), 22 deletions(-) (limited to 'networking') diff --git a/networking/netstat.c b/networking/netstat.c index d86c2ff5e..1c78f9d19 100644 --- a/networking/netstat.c +++ b/networking/netstat.c @@ -170,6 +170,11 @@ static void tcp_do_one(int lnr, char *line) rem_addr, &rem_port, &state, &txq, &rxq, &timer_run, &time_len, &retr, &uid, &timeout, &inode, more); + if (num < 10) { + bb_error_msg("warning, got bogus tcp line"); + return; + } + if (strlen(local_addr) > 8) { #if ENABLE_FEATURE_IPV6 build_ipv6_addr(local_addr, &localaddr); @@ -180,11 +185,6 @@ static void tcp_do_one(int lnr, char *line) build_ipv4_addr(rem_addr, &remaddr); } - if (num < 10) { - bb_error_msg("warning, got bogus tcp line"); - return; - } - if ((rem_port && (flags & NETSTAT_CONNECTED)) || (!rem_port && (flags & NETSTAT_LISTENING)) ) { @@ -349,17 +349,16 @@ static void unix_do_one(int nr, char *line) const char *ss_proto, *ss_state, *ss_type; char ss_flags[32]; + /* TODO: currently we stop at first NUL byte. Is it a problem? */ + if (nr == 0) return; /* skip header */ - { - char *last = last_char_is(line, '\n'); - if (last) - *last = '\0'; - } + *strchrnul(line, '\n') = '\0'; /* 2.6.15 may report lines like "... @/tmp/fam-user-^@^@^@^@^@^@^@..." - * (those ^@ are NUL bytes). fgets sees them as tons of empty lines. */ + * Other users report long lines filled by NUL bytes. + * (those ^@ are NUL bytes too). We see them as empty lines. */ if (!line[0]) return; @@ -474,20 +473,14 @@ static void do_info(const char *file, const char *name, void (*proc)(int, char * return; } lnr = 0; - do { - buffer = xmalloc_fgets(procinfo); - if (buffer) { - (proc)(lnr++, buffer); - free(buffer); - } - } while (buffer); + /* Why? because xmalloc_fgets_str doesn't stop on NULs */ + while ((buffer = xmalloc_fgets_str(procinfo, "\n")) != NULL) { + (proc)(lnr++, buffer); + free(buffer); + } fclose(procinfo); } -/* - * Our main function. - */ - int netstat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int netstat_main(int argc, char **argv) { -- cgit v1.2.3