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--- sdk:scripts:dynamic-operator [2015/05/05 15:04]
+++ sdk:scripts:dynamic-operator [2015/05/05 15:04] (current)
@@ Line 1: / Line 1: @@
+====== SDK Script dynamic-operator.are ======
+<code c dynamic-operator.are>
+/* DESC: This script will scan Mobile2 and dial the appropriate SIM on Mobile1
+ * Copyright (C) 2013 NetModule AG, Switzerland
+ *
+ */
+template operator {
+    prio;
+    sim;
+    lai;
+    apn;
+    username;
+    password;
+    int operator (int p, int s, string l, string a, string usr, string pwd) {
+        this.prio = p;
+        this.sim = s;
+        this.lai = l;
+        this.apn = a;
+        this.username = usr;
+        this.password = pwd;
+        return 0;
+    }
+};
+ME = argv[0];           /* script path */
+ARGV1 = argv[1];        /* 1st script argument */
+FORCE = 0;              /* force operator switch even if wanlink is up */
+VALID_ONLY = 1;         /* only register to networks which are allowed by SIM */
+SCAN_INTERVAL = 30;     /* network scan interval in seconds */
+TEST = 0;               /* run test */
+/* example list of operators */
+OPCNT = 0;
+OPERATORS = mkarray();
+OPERATORS[OPCNT++] = new operator
+                        (1,                             /* prio */
+,                             /* SIM1 */
+                         "22801",                       /* lai */
+                         "corporate.swisscom.ch",       /* apn */
+                         "testprofil",                  /* username */
+                         "temporary"                    /* password */
+                        );
+OPERATORS[OPCNT++] = new operator
+                        (2,                             /* prio */
+,                             /* SIM2 */
+                         "22802",                       /* lai */
+                         "internet",                    /* apn */
+                         "internet",                    /* username */
+                         "internet"                     /* password */
+                        );
+OPERATORS[OPCNT++] = new operator
+                        (3,                             /* prio */
+,                             /* EXT1 */
+                         "26201",                       /* lai */
+                         "internet.telekom",            /* apn */
+                         "tm",                          /* username */
+                         ""                             /* password */
+                        );
+/* creates file at path */
+int touch (string path)
+{
+    fd = open(path, O_CREAT | O_WRONLY);
+    if (fd < 0) return -1;
+    close(fd);
+    return 0;
+}
+/* checks if path exists */
+int exists (string path)
+{
+    fd = open(path, O_RDONLY);
+    if (fd < 0) return 0;
+    close(fd);
+    return 1;
+}
+/* copies a file */
+int copy (string from, string to)
+{
+    fpin = fopen(from, "r");
+    if (is_void(fpin)) {
+        nb_syslog("unable to open %s", from);
+        return -1;
+    }
+    fpout = fopen(to, "w+");
+    if (is_void(fpout)) {
+        fclose(fpin);
+        nb_syslog("unable to open %s", to);
+        return -1;
+    }
+    while (1) {
+        buf = fread(fpin, 1024);
+        if (is_void(buf)) break;
+        len = strlen(buf);
+        if (len == 0) break;
+        fwrite(fpout, buf, len);
+    }
+    fclose(fpin);
+    fclose(fpout);
+    return 0;
+}
+/* mkdir -p */
+int makedir (string path, int mode)
+{
+    pc = explode(path);
+    if (pc[0] != "/") {
+        nb_syslog("no absolute directory given");
+        return -1;
+    }
+    len = length(pc);
+    if (pc[len-1] != "/") pc[len++] = "/";
+    p = "";
+    for (i = 0; i < len; i++) {
+        if (pc[i] == "/" && i > 0) {
+            mkdir(p, mode);
+        }
+        p = strcat(p, pc[i]);
+    }
+    return 0;
+}
+/* returns operator index for specified lai */
+int find_operator (string lai)
+{
+    if (lai != "") {
+        /* search by lai first */
+        for (o = 0; o < OPCNT; o++) {
+            if (OPERATORS[o].lai == lai) return o;
+        }
+    }
+    return -1; /* not a known operator */
+}
+/* returns wwan interface index for specified sim index */
+int find_wwan_interface (int sim)
+{
+    for (o = 0; o < OPCNT; o++) {
+        op = OPERATORS[o];
+        if (op.sim == sim) {
+            return o;
+        }
+    }
+    return -1; /* no wwan interface with this sim */
+}
+/* returns current wwan interface index */
+int current_operator ()
+{
+    n = nb_config_get("wanlink.0.name");
+    if (strlen(n) >= 5 && left(n, 4) == "wwan") {
+        return (int)substr(n, 4, 1);
+    }
+    return -1; /* not configured */
+}
+/* activates specified operator */
+int activate_operator (int op)
+{
+    current = current_operator();
+    if (current != -1 && current == op) {
+        nb_syslog("wwan%d is already active", op);
+        return 0;
+    }
+    nb_syslog("switching to wwan%d", op);
+    if (nb_config_set(sprintf("wanlink.0.name=wwan%d", op)) != 0) {
+        nb_syslog("unable to activate wwan%d", op);
+        return -1;
+    }
+    /* re-configuration triggered */
+    nb_syslog("activated wwan%d", op);
+    /* give modem some time to register */
+    nb_syslog("waiting for wwan%d to come up", op);
+    sleep(30); /* needed for SIM switch */
+    /* wait for wanlink to come up */
+    for (i = 0; i < 20; i++) {
+        sleep(10);
+        nb_syslog("checking if wwan%d has come up", op);
+        st = nb_status("wan");
+        ifc = struct_get(st, "WANLINK1_INTERFACE");
+        if (ifc != sprintf("WWAN%d", op+1)) {
+            nb_syslog("wwan%d is not yet active");
+            continue;
+        }
+        state = struct_get(st, "WANLINK1_STATE");
+        if (state == "up") {
+            nb_syslog("wwan%d is up now", op);
+            return 0;
+        }
+        attempts = (int) struct_get(st, "WANLINK1_DIAL_ATTEMPTS");
+        nb_syslog("wwan%d has dialed for %d times", op, attempts);
+        if (attempts > 2) {
+            nb_syslog("giving up after %d dial attempts", attempts);
+            return -1;
+        }
+    }
+    nb_syslog("giving up waiting for wanlink");
+    return 0;
+}
+/* returns true if wanlink is up */
+bool wanup ()
+{
+    st = nb_status("wan");
+    state = struct_get(st, "WANLINK1_STATE");
+    return (state == "up");
+}
+/* scan test */
+struct nb_scan_test ()
+{
+    return mkstruct(
+        "NETWORK_COUNT", 2,
+        "NETWORK1_NAME", "swisscom",
+        "NETWORK1_LAI", "22801",
+        "NETWORK1_STATUS", "available",
+        "NETWORK2_NAME", "telekom",
+        "NETWORK2_LAI", "26201",
+        "NETWORK2_STATUS", "available"
+    );
+}
+/* installs config and script */
+int install ()
+{
+    path = "/config";
+    cfg = sprintf("%s/user-config.cfg", path);
+    makedir(sprintf("%s/files", path), S_IRUSR|S_IWUSR|S_IXUSR);
+    touch(cfg);
+    fp = fopen(cfg, "w");
+    if (!fp) {
+        printf("ERROR: unable to open %s\n", cfg);
+        return -1;
+    }
+    /* basic system config */
+    fwrite(fp, "config.version=1.3\n");
+    fwrite(fp, sprintf("admin.password=%s\n", nb_config_get("admin.password")));
+    /* set up OPERATORS */
+    for (o = 0; o < OPCNT; o++) {
+        op = OPERATORS[o];
+        fwrite(fp, sprintf("sim.%d.lai=%s\n", op.sim, op.lai));
+        fwrite(fp, sprintf("wwan.%d.status=1\n", o));
+        fwrite(fp, sprintf("wwan.%d.card=0\n", o));  /* force wwan0 */
+        fwrite(fp, sprintf("wwan.%d.sim=%d\n", o, op.sim));
+        fwrite(fp, sprintf("wwan.%d.number=*99***1#\n", o));
+        fwrite(fp, sprintf("wwan.%d.username=%s\n", o, op.usename));
+        fwrite(fp, sprintf("wwan.%d.password=%s\n", o, op.password));
+        fwrite(fp, sprintf("wwan.%d.apn=%s\n", o, op.apn));
+    }
+    /* enable first wwan interface */
+    fwrite(fp, "wanlink.0.name=wwan0\n");
+    fwrite(fp, "wanlink.0.prio=1\n");
+    fwrite(fp, "wanlink.0.weight=0\n");
+    fwrite(fp, "wanlink.0.mode=1\n");
+    /* install this script */
+    fwrite(fp, "sdk.status=1\n");
+    fwrite(fp, "sdk.trigger.0.name=SDK-STARTUP\n");
+    fwrite(fp, "sdk.trigger.0.event=sdk-startup\n");
+    fwrite(fp, "sdk.script.0.name=dynamic-operator\n");
+    fwrite(fp, "sdk.job.0.name=DYNAMIC-OPERATOR\n");
+    fwrite(fp, "sdk.job.0.trigger=0\n");
+    fwrite(fp, "sdk.job.0.script=0\n");
+    scriptpath = sprintf("%s/files/home/sdk/scripts/uploaded", path);
+    makedir(scriptpath, S_IRUSR|S_IWUSR|S_IXUSR);
+    fclose(fp);
+    if (copy(ME, sprintf("%s/dynamic-operator", scriptpath)) != 0) {
+        printf("ERROR: cannot copy script");
+        return -1;
+    }
+    return nb_update_config(sprintf("dir://%s", path));
+}
+/* -------------------------------- main -------------------------------- */
+nb_syslog("starting %s", ME);
+if (ARGV1 == "install") {
+    /* script installation requested */
+    printf("installing script and its config\n");
+    if (install() != 0) {
+        printf("unable to install script\n");
+        exit(1);
+    } else {
+        printf("successfully installed script\n");
+    }
+    /* script will terminate at this point */
+    exit(0);
+}
+/* re-read operators */
+OPCNT = 0;
+OPERATORS = mkarray();
+for (i = 0; i < 14; i++) {
+    status = nb_config_get(sprintf("wwan.%d.status", i));
+    if (status != "1") {
+        continue;
+    }
+    sim = nb_config_get(sprintf("wwan.%d.sim", i));
+    if (sim < 0) {
+        nb_syslog("invalid sim for wwan%d", i);
+        continue;
+    }
+    lai = nb_config_get(sprintf("sim.%d.lai", sim));
+    OPERATORS[OPCNT].prio = i;
+    OPERATORS[OPCNT].lai = lai;
+    OPERATORS[OPCNT].sim = sim;
+    OPERATORS[OPCNT].username = nb_config_get(sprintf("wwan.%d.username", i));
+    OPERATORS[OPCNT].password = nb_config_get(sprintf("wwan.%d.password", i));
+    OPERATORS[OPCNT].apn = nb_config_get(sprintf("wwan.%d.apn", i));
+    nb_syslog("added operator%d (prio %d, sim %d, lai %s)",
+                OPCNT, i, sim, lai);
+    OPCNT++;
+}
+while (1) {
+    nb_syslog("sleeping");
+    sleep(SCAN_INTERVAL);
+    /* get wanlink state */
+    up = wanup();
+    if (up) {
+        nb_syslog("wanlink is up");
+    } else {
+        nb_syslog("wanlink is down");
+    }
+    /* get current operator */
+    current = current_operator();
+    if (current != -1) {
+        nb_syslog("current is wwan%d", current);
+    }
+    if (up && current != -1) {
+        nb_syslog("wwan%d is up", current);
+        if (FORCE != 1) continue;
+    }
+    /* scan networks */
+    nb_syslog("scanning networks");
+    if (TEST == 1) {
+        nets = nb_scan_test();
+    } else {
+        nets = nb_scan_networks("Mobile2");
+    }
+    nr_nets = struct_get(nets, "NETWORK_COUNT");
+    if (is_void(nr_nets) || nr_nets < 1) {
+        nb_syslog("no networks found");
+        continue;
+    }
+    nb_syslog("%d networks found", nr_nets);
+    best = -1;
+    prio = -1;
+    for (i = 1; i <= nr_nets; i++) {
+        net = trim(struct_get(nets, sprintf("NETWORK%d_NAME", i)));
+        lai = trim(struct_get(nets, sprintf("NETWORK%d_LAI", i)));
+        status = trim(struct_get(nets, sprintf("NETWORK%d_STATUS", i)));
+        nb_syslog("detected network '%s' (lai %s, status %s)", net, lai, status);
+        if (VALID_ONLY == 1 && status != "available") continue;
+        op = find_operator(lai, net);
+        if (op == -1) {
+            nb_syslog("network '%s' does not belong to a known operator", net);
+            continue;
+        }
+        if (current != -1 && op == current) {
+            /* skip current operator */
+            continue;
+        }
+        if (prio == -1 || OPERATORS[op].prio < prio) {
+            best = op;
+            prio = OPERATORS[op].prio;
+        }
+    }
+    if (best != -1) {
+        /* activate best operator */
+        activate_operator(best);
+    } else {
+        nb_syslog("no better operator found");
+    }
+}
+exit(0);
+</code>

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