From 084266ed520805bbc4ec3f9b4d14e644ecd75880 Mon Sep 17 00:00:00 2001 From: Denis Vlasenko Date: Sat, 26 Jul 2008 23:08:31 +0000 Subject: fix several problems with config parser: a bug where it underflows the string a bug where it never frees parser_t struct make read_config() return 0 if parser is NULL, make config_close() accept and ignore NULL parser - eliminates many if() blocks reverse the sense of parser bit flags - negative flags are harder to grok. hexdump: revert the change to use config parser, it is BIGGER and also requires additional quirks in parser *: explicitly use PARSER_NORMAL instead of 0 function old new delta login_main 1575 1596 +21 config_close 18 29 +11 bbunpack 383 391 +8 qgravechar 106 109 +3 rtnl_tab_initialize 121 117 -4 expand 1697 1693 -4 man_main 717 712 -5 nameif_main 674 668 -6 hexdump_main 597 591 -6 read_config 217 209 -8 dnsd_main 1478 1470 -8 sysctl_main 203 189 -14 config_open2 44 25 -19 make_device 1177 1141 -36 config_read 597 549 -48 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 4/11 up/down: 43/-158) Total: -115 bytes --- networking/dnsd.c | 60 +++++++++++++++++++--------------------- networking/hostname.c | 2 +- networking/libiproute/rt_names.c | 4 +-- networking/nameif.c | 10 +++---- networking/udhcp/files.c | 5 +--- 5 files changed, 36 insertions(+), 45 deletions(-) (limited to 'networking') diff --git a/networking/dnsd.c b/networking/dnsd.c index efb5cfb..e8dcb40 100644 --- a/networking/dnsd.c +++ b/networking/dnsd.c @@ -106,43 +106,41 @@ static void undot(uint8_t * rip) */ static void dnsentryinit(void) { + char *token[2]; parser_t *parser; struct dns_entry *m, *prev; prev = dnsentry = NULL; parser = config_open(fileconf); - if (parser) { - char *token[2]; - while (config_read(parser, token, 2, 2, "# \t", 0)) { - unsigned int a,b,c,d; - /* - * Assumes all host names are lower case only - * Hostnames with more than one label are not handled correctly. - * Presently the dot is copied into name without - * converting to a length/string substring for that label. - */ -// if (!token[1] || sscanf(token[1], ".%u.%u.%u.%u"+1, &a, &b, &c, &d) != 4) - if (sscanf(token[1], ".%u.%u.%u.%u"+1, &a, &b, &c, &d) != 4) - continue; - - m = xzalloc(sizeof(*m)); - /*m->next = NULL;*/ - sprintf(m->ip, ".%u.%u.%u.%u"+1, a, b, c, d); - sprintf(m->rip, ".%u.%u.%u.%u", d, c, b, a); - undot((uint8_t*)m->rip); - convname(m->name, (uint8_t*)token[0]); - - if (OPT_verbose) - fprintf(stderr, "\tname:%s, ip:%s\n", &(m->name[1]), m->ip); - - if (prev == NULL) - dnsentry = m; - else - prev->next = m; - prev = m; - } - config_close(parser); + while (config_read(parser, token, 2, 2, "# \t", PARSE_NORMAL)) { + unsigned a, b, c, d; + /* + * Assumes all host names are lower case only + * Hostnames with more than one label are not handled correctly. + * Presently the dot is copied into name without + * converting to a length/string substring for that label. + */ +// if (!token[1] || sscanf(token[1], ".%u.%u.%u.%u"+1, &a, &b, &c, &d) != 4) + if (sscanf(token[1], ".%u.%u.%u.%u"+1, &a, &b, &c, &d) != 4) + continue; + + m = xzalloc(sizeof(*m)); + /*m->next = NULL;*/ + sprintf(m->ip, ".%u.%u.%u.%u"+1, a, b, c, d); + sprintf(m->rip, ".%u.%u.%u.%u", d, c, b, a); + undot((uint8_t*)m->rip); + convname(m->name, (uint8_t*)token[0]); + + if (OPT_verbose) + fprintf(stderr, "\tname:%s, ip:%s\n", &(m->name[1]), m->ip); + + if (prev == NULL) + dnsentry = m; + else + prev->next = m; + prev = m; } + config_close(parser); } /* diff --git a/networking/hostname.c b/networking/hostname.c index dd2a206..48e70db 100644 --- a/networking/hostname.c +++ b/networking/hostname.c @@ -20,7 +20,7 @@ static void do_sethostname(char *s, int isfile) return; if (isfile) { parser_t *parser = config_open2(s, xfopen_for_read); - while (config_read(parser, &s, 1, 1, "# \t", 0)) { + while (config_read(parser, &s, 1, 1, "# \t", PARSE_NORMAL & ~PARSE_GREEDY)) { do_sethostname(s, 0); } if (ENABLE_FEATURE_CLEAN_UP) diff --git a/networking/libiproute/rt_names.c b/networking/libiproute/rt_names.c index 1a2d52e..e4d1061 100644 --- a/networking/libiproute/rt_names.c +++ b/networking/libiproute/rt_names.c @@ -20,9 +20,7 @@ static void rtnl_tab_initialize(const char *file, const char **tab, int size) { char *token[2]; parser_t *parser = config_open2(file, fopen_for_read); - if (!parser) - return; - while (config_read(parser, token, 2, 2, "# \t", 0)) { + while (config_read(parser, token, 2, 2, "# \t", PARSE_NORMAL)) { int id = bb_strtou(token[0], NULL, 0); if (id < 0 || id > size) { bb_error_msg("database %s is corrupted at line %d", diff --git a/networking/nameif.c b/networking/nameif.c index 5a3bd60..12c08f1 100644 --- a/networking/nameif.c +++ b/networking/nameif.c @@ -160,13 +160,11 @@ int nameif_main(int argc, char **argv) prepend_new_eth_table(&clist, ifname, *argv++); } } else { + char *tokens[2]; struct parser_t *parser = config_open(fname); - if (parser) { - char *tokens[2]; - while (config_read(parser, tokens, 2, 2, "# \t", 0)) - prepend_new_eth_table(&clist, tokens[0], tokens[1]); - config_close(parser); - } + while (config_read(parser, tokens, 2, 2, "# \t", PARSE_NORMAL)) + prepend_new_eth_table(&clist, tokens[0], tokens[1]); + config_close(parser); } ctl_sk = xsocket(PF_INET, SOCK_DGRAM, 0); diff --git a/networking/udhcp/files.c b/networking/udhcp/files.c index 264a988..ff5847d 100644 --- a/networking/udhcp/files.c +++ b/networking/udhcp/files.c @@ -318,10 +318,7 @@ void read_config(const char *file) keywords[i].handler(keywords[i].def, keywords[i].var); parser = config_open(file); - if (!parser) - return; - - while (config_read(parser, token, 2, 2, "# \t", PARSE_LAST_IS_GREEDY)) { + while (config_read(parser, token, 2, 2, "# \t", PARSE_NORMAL)) { for (k = keywords, i = 0; i < ARRAY_SIZE(keywords); k++, i++) { if (!strcasecmp(token[0], k->keyword)) { if (!k->handler(token[1], k->var)) { -- cgit v1.1