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[76.171.169.87]) by mx.google.com with ESMTPSA id zn4sm9702147pac.21.2013.07.03.10.32.02 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Wed, 03 Jul 2013 10:32:03 -0700 (PDT) Date: Wed, 3 Jul 2013 00:29:12 -0400 From: Phil Oester To: netfilter-devel@vger.kernel.org Cc: pablo@netfilter.org, zenczykowski@gmail.com Subject: [PATCH v2] iptables: Sort table names in ip[6]tables-save Message-ID: <20130703042912.GA12864@gmail.com> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) X-Gm-Message-State: ALoCoQmkgVFXgxfRn1UxCJEnH0WaOYfvb6melTriZ4jOAbdntqTaeXLv92m1PEWIgOzYbY3/RzUt Sender: netfilter-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netfilter-devel@vger.kernel.org Depending upon the load order of rules, the output from ip[6]tables-save will vary, as ip[6]_tables_names is sorted LIFO. As reported by Linus van Geuns, this makes comparing output from ip[6]tables-save across reboots difficult. Fix this by sorting table names prior to walking the tables, making output consistent. This closes bugzilla #580. Phil Signed-off-by: Phil Oester --- v2: Add option to disable sorting - feedback from Maciej Żenczykowski diff --git a/include/xtables.h b/include/xtables.h index c35a6e6..dc6e566 100644 --- a/include/xtables.h +++ b/include/xtables.h @@ -479,6 +479,8 @@ extern void xtables_ip6parse_any(const char *, struct in6_addr **, extern void xtables_ip6parse_multiple(const char *, struct in6_addr **, struct in6_addr **, unsigned int *); +extern int stringcmp(const void *, const void *); + /** * Print the specified value to standard output, quoting dangerous * characters if required. diff --git a/iptables/ip6tables-save.8 b/iptables/ip6tables-save.8 index 457be82..cc70e43 100644 --- a/iptables/ip6tables-save.8 +++ b/iptables/ip6tables-save.8 @@ -39,6 +39,10 @@ include the current values of all packet and byte counters in the output \fB\-t\fR, \fB\-\-table\fR \fItablename\fP restrict output to only one table. If not specified, output includes all available tables. +.TP +\fB\-u\fR, \fB\-\-unsorted\fR +by default, tables are output in alphabetical order. This option disables +sorting, and tables are output in LIFO order. .SH BUGS None known as of iptables-1.2.1 release .SH AUTHORS diff --git a/iptables/ip6tables-save.c b/iptables/ip6tables-save.c index d819b30..3a51fe4 100644 --- a/iptables/ip6tables-save.c +++ b/iptables/ip6tables-save.c @@ -9,6 +9,7 @@ #include #include #include +#include #include #include #include @@ -23,12 +24,14 @@ #endif static int show_counters = 0; +static bool sort_tables = true; static const struct option options[] = { {.name = "counters", .has_arg = false, .val = 'c'}, {.name = "dump", .has_arg = false, .val = 'd'}, {.name = "table", .has_arg = true, .val = 't'}, {.name = "modprobe", .has_arg = true, .val = 'M'}, + {.name = "unsorted", .has_arg = false, .val = 'u'}, {NULL}, }; @@ -36,8 +39,9 @@ static const struct option options[] = { /* Debugging prototype. */ static int for_each_table(int (*func)(const char *tablename)) { - int ret = 1; + int i, count = 0, ret = 1; FILE *procfile = NULL; + char **tables = NULL; char tablename[XT_TABLE_MAXNAMELEN+1]; procfile = fopen("/proc/net/ip6_tables_names", "re"); @@ -50,10 +54,18 @@ static int for_each_table(int (*func)(const char *tablename)) "Badly formed tablename `%s'\n", tablename); tablename[strlen(tablename) - 1] = '\0'; - ret &= func(tablename); + count++; + tables = (char **)realloc(tables, sizeof(char*)*count); + tables[count-1] = strdup(tablename); } - fclose(procfile); + + if (sort_tables == true) + qsort(tables, count, sizeof(char *), stringcmp); + for (i = 0 ; i < count ; i++) { + ret &= func(tables[i]); + } + return ret; } @@ -141,7 +153,7 @@ int ip6tables_save_main(int argc, char *argv[]) init_extensions6(); #endif - while ((c = getopt_long(argc, argv, "bcdt:", options, NULL)) != -1) { + while ((c = getopt_long(argc, argv, "bcdt:u", options, NULL)) != -1) { switch (c) { case 'c': show_counters = 1; @@ -154,6 +166,9 @@ int ip6tables_save_main(int argc, char *argv[]) case 'M': xtables_modprobe_program = optarg; break; + case 'u': + sort_tables = false; + break; case 'd': do_output(tablename); exit(0); diff --git a/iptables/iptables-save.8 b/iptables/iptables-save.8 index c2e0a94..862fb9d 100644 --- a/iptables/iptables-save.8 +++ b/iptables/iptables-save.8 @@ -39,6 +39,10 @@ include the current values of all packet and byte counters in the output \fB\-t\fR, \fB\-\-table\fR \fItablename\fP restrict output to only one table. If not specified, output includes all available tables. +.TP +\fB\-u\fR, \fB\-\-unsorted\fR +by default, tables are output in alphabetical order. This option disables +sorting, and tables are output in LIFO order. .SH BUGS None known as of iptables-1.2.1 release .SH AUTHOR diff --git a/iptables/iptables-save.c b/iptables/iptables-save.c index e599fce..c194d9f 100644 --- a/iptables/iptables-save.c +++ b/iptables/iptables-save.c @@ -9,6 +9,7 @@ #include #include #include +#include #include #include #include @@ -22,20 +23,23 @@ #endif static int show_counters = 0; +static bool sort_tables = true; static const struct option options[] = { {.name = "counters", .has_arg = false, .val = 'c'}, {.name = "dump", .has_arg = false, .val = 'd'}, {.name = "table", .has_arg = true, .val = 't'}, {.name = "modprobe", .has_arg = true, .val = 'M'}, + {.name = "unsorted", .has_arg = false, .val = 'u'}, {NULL}, }; /* Debugging prototype. */ static int for_each_table(int (*func)(const char *tablename)) { - int ret = 1; + int i, count = 0, ret = 1; FILE *procfile = NULL; + char **tables = NULL; char tablename[XT_TABLE_MAXNAMELEN+1]; procfile = fopen("/proc/net/ip_tables_names", "re"); @@ -48,10 +52,18 @@ static int for_each_table(int (*func)(const char *tablename)) "Badly formed tablename `%s'\n", tablename); tablename[strlen(tablename) - 1] = '\0'; - ret &= func(tablename); + count++; + tables = (char **)realloc(tables, sizeof(char*)*count); + tables[count-1] = strdup(tablename); } - fclose(procfile); + + if (sort_tables == true) + qsort(tables, count, sizeof(char *), stringcmp); + for (i = 0 ; i < count ; i++) { + ret &= func(tables[i]); + } + return ret; } @@ -140,7 +152,7 @@ iptables_save_main(int argc, char *argv[]) init_extensions4(); #endif - while ((c = getopt_long(argc, argv, "bcdt:", options, NULL)) != -1) { + while ((c = getopt_long(argc, argv, "bcdt:u", options, NULL)) != -1) { switch (c) { case 'c': show_counters = 1; @@ -153,6 +165,9 @@ iptables_save_main(int argc, char *argv[]) case 'M': xtables_modprobe_program = optarg; break; + case 'u': + sort_tables = false; + break; case 'd': do_output(tablename); exit(0); diff --git a/libxtables/xtables.c b/libxtables/xtables.c index ebc77b6..ca94f4e 100644 --- a/libxtables/xtables.c +++ b/libxtables/xtables.c @@ -1957,3 +1957,10 @@ void get_kernel_version(void) sscanf(uts.release, "%d.%d.%d", &x, &y, &z); kernel_version = LINUX_VERSION(x, y, z); } + +int stringcmp(const void *a, const void *b) +{ + const char **ia = (const char **)a; + const char **ib = (const char **)b; + return strcmp(*ia, *ib); +}