Add command set

Signed-off-by: Adrien Gallouët <adrien@gallouet.fr>

src/set.c

@@ -0,0 +1,121 @@
+#include "common.h"
+#include "ctl.h"
+#include "str.h"
+
+#include <stdio.h>
+#include <sys/socket.h>
+
+#include "../argz/argz.h"
+
+static ssize_t
+gt_reply(int fd, struct ctl_msg *res, struct ctl_msg *req)
+{
+    if ((send(fd, req, sizeof(struct ctl_msg), 0) == -1) ||
+        (recv(fd, res, sizeof(struct ctl_msg), 0) == -1)) {
+        int err = errno;
+        ctl_delete(fd);
+        errno = err;
+        return -1;
+    }
+
+    if (res->type == CTL_REPLY) {
+        if (res->reply < 0) {
+            errno = res->reply;
+            return -1;
+        }
+    } else {
+        errno = EINTR;
+        return -1;
+    }
+
+    return 0;
+}
+
+static int
+gt_set_mtu(int fd, size_t mtu)
+{
+    struct ctl_msg res, req = {
+        .type = CTL_MTU,
+        .mtu = mtu,
+    };
+
+    int ret = gt_reply(fd, &res, &req);
+
+    if (!ret)
+        printf("new mtu: %i\n", res.reply);
+
+    return ret;
+}
+
+static int
+gt_set_timeout(int fd, unsigned long timeout)
+{
+    struct ctl_msg res, req = {
+        .type = CTL_TIMEOUT,
+        .timeout = timeout,
+    };
+
+    return gt_reply(fd, &res, &req);
+}
+
+static int
+gt_set_timetolerance(int fd, unsigned long timetolerance)
+{
+    struct ctl_msg res, req = {
+        .type = CTL_TIMETOLERANCE,
+        .timetolerance = timetolerance,
+    };
+
+    return gt_reply(fd, &res, &req);
+}
+
+int
+gt_set(int argc, char **argv)
+{
+    const char *dev = "tun0";
+    unsigned long timetolerance = 0;
+    unsigned long timeout = 0;
+    size_t mtu = 0;
+
+    struct argz pathz[] = {
+        {"dev", "NAME", &dev, argz_str},
+        {"mtu", "BYTES", &mtu, argz_bytes},
+        {"timeout", "SECONDS", &timeout, argz_time},
+        {"timetolerance", "SECONDS", &timetolerance, argz_time},
+        {}};
+
+    if (argz(pathz, argc, argv))
+        return 1;
+
+    int fd = ctl_create("/run/" PACKAGE_NAME, NULL);
+
+    if (fd == -1) {
+        perror("ctl_create");
+        return 1;
+    }
+
+    if (ctl_connect(fd, "/run/" PACKAGE_NAME, dev) == -1) {
+        gt_log("couldn't connect to %s\n", dev);
+        ctl_delete(fd);
+        return 1;
+    }
+
+    if (mtu && gt_set_mtu(fd, mtu)) {
+        perror("mtu");
+        return 1;
+    }
+
+    if (timeout && gt_set_timeout(fd, timeout)) {
+        perror("timeout");
+        return 1;
+    }
+
+    if (timetolerance && gt_set_timetolerance(fd, timetolerance)) {
+        perror("timetolerance");
+        return 1;
+    }
+
+    ctl_delete(fd);
+
+    return 0;
+}