ifupdown: strlen(NULL) is a no-no, fixed. Also few micro-optimizations

author: Denis Vlasenko <vda.linux@googlemail.com> 2006-12-18 21:02:00 +0000
committer: Denis Vlasenko <vda.linux@googlemail.com> 2006-12-18 21:02:00 +0000
commit: fcfe834d501b1bd0de45c7cb39ca0a259177934f (patch)
tree: 945faea9086418e09ada36d1fde1c02204f299e4 /networking
parent: 6dca70a04908f190c63ca76853ec2e7e0ea20c06 (diff)
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1 files changed, 76 insertions, 80 deletions
diff --git a/networking/ifupdown.c b/networking/ifupdown.c
index 76ff2a830..93d7bc520 100644
--- a/networking/ifupdown.c
+++ b/networking/ifupdown.c
@@ -25,11 +25,11 @@
 #define EUNDEFVAR   10002
 #define EUNBALPER   10000
-#ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
+#if ENABLE_FEATURE_IFUPDOWN_MAPPING
 #define MAX_INTERFACE_LENGTH 10
 #endif
-#define debug_noise(fmt, args...)
+#define debug_noise(args...) /*fprintf(stderr, args)*/
 /* Forward declaration */
 struct interface_defn_t;
@@ -109,7 +109,7 @@ static char *startup_PATH;
 #if ENABLE_FEATURE_IFUPDOWN_IPV4 || ENABLE_FEATURE_IFUPDOWN_IPV6
-#ifdef CONFIG_FEATURE_IFUPDOWN_IP
+#if ENABLE_FEATURE_IFUPDOWN_IP
 static unsigned count_bits(unsigned a)
 {
@@ -184,10 +184,10 @@ static char *get_var(const char *id, size_t idlen, struct interface_defn_t *ifd)
 static char *parse(const char *command, struct interface_defn_t *ifd)
 {
-        char *result = NULL;
        size_t old_pos[MAX_OPT_DEPTH] = { 0 };
        int okay[MAX_OPT_DEPTH] = { 1 };
        int opt_depth = 1;
+        char *result = xstrdup("");
        while (*command) {
                switch (*command) {
@@ -245,10 +245,10 @@ static char *parse(const char *command, struct interface_defn_t *ifd)
                                if (varvalue) {
                                        addstr(&result, varvalue, strlen(varvalue));
                                } else {
-#ifdef CONFIG_FEATURE_IFUPDOWN_IP
+#if ENABLE_FEATURE_IFUPDOWN_IP
                                        /* Sigh...  Add a special case for 'ip' to convert from
                                         * dotted quad to bit count style netmasks.  */
-                                        if (strncmp(command, "bnmask", 6)==0) {
+                                        if (strncmp(command, "bnmask", 6) == 0) {
                                                unsigned res;
                                                varvalue = get_var("netmask", 7, ifd);
                                                if (varvalue && (res = count_netmask_bits(varvalue)) > 0) {
@@ -290,7 +290,7 @@ static int execute(const char *command, struct interface_defn_t *ifd, execfn *ex
        int ret;
        out = parse(command, ifd);
-        if (!out) {
+        if (!out || !out[0]) {
                return 0;
        }
        ret = (*exec)(out);
@@ -303,10 +303,10 @@ static int execute(const char *command, struct interface_defn_t *ifd, execfn *ex
 }
 #endif
-#ifdef CONFIG_FEATURE_IFUPDOWN_IPV6
+#if ENABLE_FEATURE_IFUPDOWN_IPV6
 static int loopback_up6(struct interface_defn_t *ifd, execfn *exec)
 {
-#ifdef CONFIG_FEATURE_IFUPDOWN_IP
+#if ENABLE_FEATURE_IFUPDOWN_IP
        int result;
        result = execute("ip addr add ::1 dev %iface%", ifd, exec);
        result += execute("ip link set %iface% up", ifd, exec);
@@ -318,7 +318,7 @@ static int loopback_up6(struct interface_defn_t *ifd, execfn *exec)
 static int loopback_down6(struct interface_defn_t *ifd, execfn *exec)
 {
-#ifdef CONFIG_FEATURE_IFUPDOWN_IP
+#if ENABLE_FEATURE_IFUPDOWN_IP
        return execute("ip link set %iface% down", ifd, exec);
 #else
        return execute("ifconfig %iface% del ::1", ifd, exec);
@@ -328,36 +328,37 @@ static int loopback_down6(struct interface_defn_t *ifd, execfn *exec)
 static int static_up6(struct interface_defn_t *ifd, execfn *exec)
 {
        int result;
-#ifdef CONFIG_FEATURE_IFUPDOWN_IP
+#if ENABLE_FEATURE_IFUPDOWN_IP
-        result = execute("ip addr add %address%/%netmask% dev %iface% [[label %label%]]", ifd, exec);
+        result = execute("ip addr add %address%/%netmask% dev %iface%[[ label %label%]]", ifd, exec);
-        result += execute("ip link set [[mtu %mtu%]] [[address %hwaddress%]] %iface% up", ifd, exec);
+        result += execute("ip link set[[ mtu %mtu%]][[ address %hwaddress%]] %iface% up", ifd, exec);
-        result += execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec);
+        /* Was: "[[ ip ....%gateway% ]]". Removed extra spaces w/o checking */
+        result += execute("[[ip route add ::/0 via %gateway%]]", ifd, exec);
 #else
-        result = execute("ifconfig %iface% [[media %media%]] [[hw %hwaddress%]] [[mtu %mtu%]] up", ifd, exec);
+        result = execute("ifconfig %iface%[[ media %media%]][[ hw %hwaddress%]][[ mtu %mtu%]] up", ifd, exec);
        result += execute("ifconfig %iface% add %address%/%netmask%", ifd, exec);
-        result += execute("[[ route -A inet6 add ::/0 gw %gateway% ]]", ifd, exec);
+        result += execute("[[route -A inet6 add ::/0 gw %gateway%]]", ifd, exec);
 #endif
        return ((result == 3) ? 3 : 0);
 }
 static int static_down6(struct interface_defn_t *ifd, execfn *exec)
 {
-#ifdef CONFIG_FEATURE_IFUPDOWN_IP
+#if ENABLE_FEATURE_IFUPDOWN_IP
        return execute("ip link set %iface% down", ifd, exec);
 #else
        return execute("ifconfig %iface% down", ifd, exec);
 #endif
 }
-#ifdef CONFIG_FEATURE_IFUPDOWN_IP
+#if ENABLE_FEATURE_IFUPDOWN_IP
 static int v4tunnel_up(struct interface_defn_t *ifd, execfn *exec)
 {
        int result;
        result = execute("ip tunnel add %iface% mode sit remote "
-                        "%endpoint% [[local %local%]] [[ttl %ttl%]]", ifd, exec);
+                        "%endpoint%[[ local %local%]][[ ttl %ttl%]]", ifd, exec);
        result += execute("ip link set %iface% up", ifd, exec);
        result += execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec);
-        result += execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec);
+        result += execute("[[ip route add ::/0 via %gateway%]]", ifd, exec);
        return ((result == 4) ? 4 : 0);
 }
@@ -368,7 +369,7 @@ static int v4tunnel_down(struct interface_defn_t * ifd, execfn * exec)
 #endif
 static const struct method_t methods6[] = {
-#ifdef CONFIG_FEATURE_IFUPDOWN_IP
+#if ENABLE_FEATURE_IFUPDOWN_IP
        { "v4tunnel", v4tunnel_up, v4tunnel_down, },
 #endif
        { "static", static_up6, static_down6, },
@@ -380,12 +381,12 @@ static const struct address_family_t addr_inet6 = {
        sizeof(methods6) / sizeof(struct method_t),
        methods6
 };
-#endif /* CONFIG_FEATURE_IFUPDOWN_IPV6 */
+#endif /* FEATURE_IFUPDOWN_IPV6 */
-#ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
+#if ENABLE_FEATURE_IFUPDOWN_IPV4
 static int loopback_up(struct interface_defn_t *ifd, execfn *exec)
 {
-#ifdef CONFIG_FEATURE_IFUPDOWN_IP
+#if ENABLE_FEATURE_IFUPDOWN_IP
        int result;
        result = execute("ip addr add 127.0.0.1/8 dev %iface%", ifd, exec);
        result += execute("ip link set %iface% up", ifd, exec);
@@ -397,7 +398,7 @@ static int loopback_up(struct interface_defn_t *ifd, execfn *exec)
 static int loopback_down(struct interface_defn_t *ifd, execfn *exec)
 {
-#ifdef CONFIG_FEATURE_IFUPDOWN_IP
+#if ENABLE_FEATURE_IFUPDOWN_IP
        int result;
        result = execute("ip addr flush dev %iface%", ifd, exec);
        result += execute("ip link set %iface% down", ifd, exec);
@@ -410,21 +411,21 @@ static int loopback_down(struct interface_defn_t *ifd, execfn *exec)
 static int static_up(struct interface_defn_t *ifd, execfn *exec)
 {
        int result;
-#ifdef CONFIG_FEATURE_IFUPDOWN_IP
+#if ENABLE_FEATURE_IFUPDOWN_IP
-        result = execute("ip addr add %address%/%bnmask% [[broadcast %broadcast%]] "
+        result = execute("ip addr add %address%/%bnmask%[[ broadcast %broadcast%]] "
-                        "dev %iface% [[peer %pointopoint%]] [[label %label%]]", ifd, exec);
+                        "dev %iface%[[ peer %pointopoint%]][[ label %label%]]", ifd, exec);
-        result += execute("ip link set [[mtu %mtu%]] [[address %hwaddress%]] %iface% up", ifd, exec);
+        result += execute("ip link set[[ mtu %mtu%]][[ address %hwaddress%]] %iface% up", ifd, exec);
-        result += execute("[[ ip route add default via %gateway% dev %iface% ]]", ifd, exec);
+        result += execute("[[ip route add default via %gateway% dev %iface%]]", ifd, exec);
        return ((result == 3) ? 3 : 0);
 #else
        /* ifconfig said to set iface up before it processes hw %hwaddress%,
         * which then of course fails. Thus we run two separate ifconfig */
-        result = execute("ifconfig %iface% [[hw %hwaddress%]] [[media %media%]] [[mtu %mtu%]] up",
+        result = execute("ifconfig %iface%[[ hw %hwaddress%]][[ media %media%]][[ mtu %mtu%]] up",
                                ifd, exec);
-        result += execute("ifconfig %iface% %address% netmask %netmask% "
+        result += execute("ifconfig %iface% %address% netmask %netmask%"
-                                "[[broadcast %broadcast%]] [[pointopoint %pointopoint%]] ",
+                                "[[ broadcast %broadcast%]][[ pointopoint %pointopoint%]] ",
                                ifd, exec);
-        result += execute("[[ route add default gw %gateway% %iface% ]]", ifd, exec);
+        result += execute("[[route add default gw %gateway% %iface%]]", ifd, exec);
        return ((result == 3) ? 3 : 0);
 #endif
 }
@@ -432,17 +433,17 @@ static int static_up(struct interface_defn_t *ifd, execfn *exec)
 static int static_down(struct interface_defn_t *ifd, execfn *exec)
 {
        int result;
-#ifdef CONFIG_FEATURE_IFUPDOWN_IP
+#if ENABLE_FEATURE_IFUPDOWN_IP
        result = execute("ip addr flush dev %iface%", ifd, exec);
        result += execute("ip link set %iface% down", ifd, exec);
 #else
-        result = execute("[[ route del default gw %gateway% %iface% ]]", ifd, exec);
+        result = execute("[[route del default gw %gateway% %iface%]]", ifd, exec);
        result += execute("ifconfig %iface% down", ifd, exec);
 #endif
        return ((result == 2) ? 2 : 0);
 }
-#ifndef CONFIG_APP_UDHCPC
+#if !ENABLE_APP_UDHCPC
 struct dhcp_client_t
 {
        const char *name;
@@ -452,11 +453,11 @@ struct dhcp_client_t
 static const struct dhcp_client_t ext_dhcp_clients[] = {
        { "udhcpc",
-                "udhcpc -R -n -p /var/run/udhcpc.%iface%.pid -i %iface% [[-H %hostname%]] [[-c %clientid%]] [[-s %script%]]",
+                "udhcpc -R -n -p /var/run/udhcpc.%iface%.pid -i %iface%[[ -H %hostname%]][[ -c %clientid%]][[ -s %script%]]",
                "kill -TERM `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null",
        },
        { "pump",
-                "pump -i %iface% [[-h %hostname%]] [[-l %leasehours%]]",
+                "pump -i %iface%[[ -h %hostname%]][[ -l %leasehours%]]",
                "pump -i %iface% -k",
        },
        { "dhclient",
@@ -464,7 +465,7 @@ static const struct dhcp_client_t ext_dhcp_clients[] = {
                "kill -9 `cat /var/run/dhclient.%iface%.pid` 2>/dev/null",
        },
        { "dhcpcd",
-                "dhcpcd [[-h %hostname%]] [[-i %vendor%]] [[-I %clientid%]] [[-l %leasetime%]] %iface%",
+                "dhcpcd[[ -h %hostname%]][[ -i %vendor%]][[ -I %clientid%]][[ -l %leasetime%]] %iface%",
                "dhcpcd -k %iface%",
        },
 };
@@ -472,9 +473,9 @@ static const struct dhcp_client_t ext_dhcp_clients[] = {
 static int dhcp_up(struct interface_defn_t *ifd, execfn *exec)
 {
-#ifdef CONFIG_APP_UDHCPC
+#if ENABLE_APP_UDHCPC
        return execute("udhcpc -R -n -p /var/run/udhcpc.%iface%.pid "
-                        "-i %iface% [[-H %hostname%]] [[-c %clientid%]] [[-s %script%]]",
+                        "-i %iface%[[ -H %hostname%]][[ -c %clientid%]][[ -s %script%]]",
                        ifd, exec);
 #else
        int i, nclients = sizeof(ext_dhcp_clients) / sizeof(ext_dhcp_clients[0]);
@@ -489,7 +490,7 @@ static int dhcp_up(struct interface_defn_t *ifd, execfn *exec)
 static int dhcp_down(struct interface_defn_t *ifd, execfn *exec)
 {
-#ifdef CONFIG_APP_UDHCPC
+#if ENABLE_APP_UDHCPC
        return execute("kill -TERM "
                       "`cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec);
 #else
@@ -510,30 +511,30 @@ static int manual_up_down(struct interface_defn_t *ifd, execfn *exec)
 static int bootp_up(struct interface_defn_t *ifd, execfn *exec)
 {
-        return execute("bootpc [[--bootfile %bootfile%]] --dev %iface% "
+        return execute("bootpc[[ --bootfile %bootfile%]] --dev %iface%"
-                        "[[--server %server%]] [[--hwaddr %hwaddr%]] "
+                        "[[ --server %server%]][[ --hwaddr %hwaddr%]] "
                        "--returniffail --serverbcast", ifd, exec);
 }
 static int ppp_up(struct interface_defn_t *ifd, execfn *exec)
 {
-        return execute("pon [[%provider%]]", ifd, exec);
+        return execute("pon[[ %provider%]]", ifd, exec);
 }
 static int ppp_down(struct interface_defn_t *ifd, execfn *exec)
 {
-        return execute("poff [[%provider%]]", ifd, exec);
+        return execute("poff[[ %provider%]]", ifd, exec);
 }
 static int wvdial_up(struct interface_defn_t *ifd, execfn *exec)
 {
-        return execute("/sbin/start-stop-daemon --start -x /usr/bin/wvdial "
+        return execute("start-stop-daemon --start -x wvdial "
-                "-p /var/run/wvdial.%iface% -b -m -- [[ %provider% ]]", ifd, exec);
+                "-p /var/run/wvdial.%iface% -b -m --[[ %provider%]]", ifd, exec);
 }
 static int wvdial_down(struct interface_defn_t *ifd, execfn *exec)
 {
-        return execute("/sbin/start-stop-daemon --stop -x /usr/bin/wvdial "
+        return execute("start-stop-daemon --stop -x wvdial "
                        "-p /var/run/wvdial.%iface% -s 2", ifd, exec);
 }
@@ -553,7 +554,7 @@ static const struct address_family_t addr_inet = {
        methods
 };
-#endif  /* ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 */
+#endif  /* if ENABLE_FEATURE_IFUPDOWN_IPV4 */
 static char *next_word(char **buf)
 {
@@ -633,7 +634,7 @@ static const llist_t *find_list_string(const llist_t *list, const char *string)
 static struct interfaces_file_t *read_interfaces(const char *filename)
 {
-#ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
+#if ENABLE_FEATURE_IFUPDOWN_MAPPING
        struct mapping_defn_t *currmap = NULL;
 #endif
        struct interface_defn_t *currif = NULL;
@@ -658,7 +659,7 @@ static struct interfaces_file_t *read_interfaces(const char *filename)
                }
                if (strcmp(firstword, "mapping") == 0) {
-#ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
+#if ENABLE_FEATURE_IFUPDOWN_MAPPING
                        currmap = xzalloc(sizeof(struct mapping_defn_t));
                        while ((firstword = next_word(&buf_ptr)) != NULL) {
@@ -686,10 +687,10 @@ static struct interfaces_file_t *read_interfaces(const char *filename)
                        currently_processing = MAPPING;
                } else if (strcmp(firstword, "iface") == 0) {
                        static const struct address_family_t *const addr_fams[] = {
-#ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
+#if ENABLE_FEATURE_IFUPDOWN_IPV4
                                &addr_inet,
 #endif
-#ifdef CONFIG_FEATURE_IFUPDOWN_IPV6
+#if ENABLE_FEATURE_IFUPDOWN_IPV6
                                &addr_inet6,
 #endif
                                NULL
@@ -802,7 +803,7 @@ static struct interfaces_file_t *read_interfaces(const char *filename)
                                currif->n_options++;
                                break;
                        case MAPPING:
-#ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
+#if ENABLE_FEATURE_IFUPDOWN_MAPPING
                                if (strcmp(firstword, "script") == 0) {
                                        if (currmap->script != NULL) {
                                                bb_error_msg("duplicate script in mapping \"%s\"", buf);
@@ -908,9 +909,9 @@ static int doit(char *str)
                fflush(NULL);
                switch (child = fork()) {
-                case -1:                /* failure */
+                case -1: /* failure */
                        return 0;
-                case 0:         /* child */
+                case 0: /* child */
                        execle(DEFAULT_SHELL, DEFAULT_SHELL, "-c", str, NULL, __myenviron);
                        exit(127);
                }
@@ -941,13 +942,14 @@ static int execute_all(struct interface_defn_t *ifd, const char *opt)
        return 1;
 }
-static int check(char *str) {
+static int check(char *str)
+{
        return str != NULL;
 }
 static int iface_up(struct interface_defn_t *iface)
 {
-        if (!iface->method->up(iface,check)) return -1;
+        if (!iface->method->up(iface, check)) return -1;
        set_environ(iface, "start");
        if (!execute_all(iface, "pre-up")) return 0;
        if (!iface->method->up(iface, doit)) return 0;
@@ -965,7 +967,7 @@ static int iface_down(struct interface_defn_t *iface)
        return 1;
 }
-#ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
+#if ENABLE_FEATURE_IFUPDOWN_MAPPING
 static int popen2(FILE **in, FILE **out, char *command, ...)
 {
        va_list ap;
@@ -1069,7 +1071,7 @@ static char *run_mapping(char *physical, struct mapping_defn_t * map)
        return logical;
 }
-#endif /* CONFIG_FEATURE_IFUPDOWN_MAPPING */
+#endif /* FEATURE_IFUPDOWN_MAPPING */
 static llist_t *find_iface_state(llist_t *state_list, const char *iface)
 {
@@ -1088,8 +1090,6 @@ static llist_t *find_iface_state(llist_t *state_list, const char *iface)
 int ifupdown_main(int argc, char **argv)
 {
-        static const char statefile[] = "/var/run/ifstate";
        int (*cmds)(struct interface_defn_t *) = NULL;
        struct interfaces_file_t *defn;
        llist_t *state_list = NULL;
@@ -1097,26 +1097,25 @@ int ifupdown_main(int argc, char **argv)
        const char *interfaces = "/etc/network/interfaces";
        int any_failures = 0;
+        cmds = iface_down;
        if (applet_name[2] == 'u') {
                /* ifup command */
                cmds = iface_up;
-        } else {
-                /* ifdown command */
-                cmds = iface_down;
        }
        getopt32(argc, argv, OPTION_STR, &interfaces);
        if (argc - optind > 0) {
                if (DO_ALL) bb_show_usage();
-        } else
+        } else {
                if (!DO_ALL) bb_show_usage();
+        }
        debug_noise("reading %s file:\n", interfaces);
        defn = read_interfaces(interfaces);
        debug_noise("\ndone reading %s\n\n", interfaces);
        if (!defn) {
-                exit(EXIT_FAILURE);
+                return EXIT_FAILURE;
        }
        startup_PATH = getenv("PATH");
@@ -1179,7 +1178,7 @@ int ifupdown_main(int argc, char **argv)
                        }
                }
-#ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
+#if ENABLE_FEATURE_IFUPDOWN_MAPPING
                if ((cmds == iface_up) && !NO_MAPPINGS) {
                        struct mapping_defn_t *currmap;
@@ -1198,7 +1197,6 @@ int ifupdown_main(int argc, char **argv)
                }
 #endif
                iface_list = defn->ifaces;
                while (iface_list) {
                        currif = (struct interface_defn_t *) iface_list->data;
@@ -1208,16 +1206,16 @@ int ifupdown_main(int argc, char **argv)
                                okay = 1;
                                currif->iface = iface;
-                                debug_noise("\nConfiguring interface %s (%s)\n", liface, currif->address_family->name);
+                                debug_noise("\nZ Configuring interface %s (%s)\n", liface, currif->address_family->name);
                                /* Call the cmds function pointer, does either iface_up() or iface_down() */
                                cmds_ret = cmds(currif);
                                if (cmds_ret == -1) {
                                        bb_error_msg("don't seem to have all the variables for %s/%s",
                                                        liface, currif->address_family->name);
-                                        any_failures += 1;
+                                        any_failures = 1;
                                } else if (cmds_ret == 0) {
-                                        any_failures += 1;
+                                        any_failures = 1;
                                }
                                currif->iface = oldiface;
@@ -1230,7 +1228,7 @@ int ifupdown_main(int argc, char **argv)
                if (!okay && !FORCE) {
                        bb_error_msg("ignoring unknown interface %s", liface);
-                        any_failures += 1;
+                        any_failures = 1;
                } else {
                        llist_t *iface_state = find_iface_state(state_list, iface);
@@ -1251,9 +1249,9 @@ int ifupdown_main(int argc, char **argv)
        /* Actually write the new state */
        if (!NO_ACT) {
-                FILE *state_fp = NULL;
+                FILE *state_fp;
-                state_fp = xfopen(statefile, "w");
+                state_fp = xfopen("/var/run/ifstate", "w");
                while (state_list) {
                        if (state_list->data) {
                                fputs(state_list->data, state_fp);
@@ -1264,7 +1262,5 @@ int ifupdown_main(int argc, char **argv)
                fclose(state_fp);
        }
-        if (any_failures)
+        return any_failures;
-                return 1;
-        return 0;
 }
author	Denis Vlasenko <vda.linux@googlemail.com>	2006-12-18 21:02:00 +0000
committer	Denis Vlasenko <vda.linux@googlemail.com>	2006-12-18 21:02:00 +0000
commit	fcfe834d501b1bd0de45c7cb39ca0a259177934f (patch)
tree	945faea9086418e09ada36d1fde1c02204f299e4 /networking
parent	6dca70a04908f190c63ca76853ec2e7e0ea20c06 (diff)
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