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Diffstat (limited to 'conf.c')
-rw-r--r--conf.c85
1 files changed, 60 insertions, 25 deletions
diff --git a/conf.c b/conf.c
index fdca582..1d049d6 100644
--- a/conf.c
+++ b/conf.c
@@ -490,19 +490,51 @@ out:
}
/**
- * conf_ns_opt() - Parse non-option argument to namespace paths
+ * conf_netns() - Parse --netns option
+ * @netns: buffer of size PATH_MAX, updated with netns path
+ * @arg: --netns argument
+ *
+ * Return: 0 on success, negative error code otherwise
+ */
+static int conf_netns(char *netns, const char *arg)
+{
+ int ret;
+
+ if (!strchr(arg, '/')) {
+ /* looks like a netns name */
+ ret = snprintf(netns, PATH_MAX, "%s/%s", NETNS_RUN_DIR, arg);
+ } else {
+ /* otherwise assume it's a netns path */
+ ret = snprintf(netns, PATH_MAX, "%s", arg);
+ }
+
+ if (ret <= 0 || ret > PATH_MAX) {
+ err("Network namespace name/path %s too long");
+ return -E2BIG;
+ }
+
+ return 0;
+}
+
+/**
+ * conf_ns_pid() - Parse non-option argument as a PID
* @userns: buffer of size PATH_MAX, initially contains --userns
* argument (may be empty), updated with userns path
- * @netns: buffer of size PATH_MAX, updated with netns path
- * @arg: PID, path or name of network namespace
+ * @netns: buffer of size PATH_MAX, initial contains --netns
+ * argument (may be empty), updated with netns path
+ * @arg: PID of network namespace
*
* Return: 0 on success, negative error code otherwise
*/
-static int conf_ns_opt(char *userns, char *netns, const char *arg)
+static int conf_ns_pid(char *userns, char *netns, const char *arg)
{
char *endptr;
long pidval;
- int ret;
+
+ if (*netns) {
+ err("Both --netns and PID given");
+ return -EINVAL;
+ }
pidval = strtol(arg, &endptr, 10);
if (!*endptr) {
@@ -518,20 +550,7 @@ static int conf_ns_opt(char *userns, char *netns, const char *arg)
return 0;
}
- if (!strchr(arg, '/')) {
- /* looks like a netns name */
- ret = snprintf(netns, PATH_MAX, "%s/%s", NETNS_RUN_DIR, arg);
- } else {
- /* otherwise assume it's a netns path */
- ret = snprintf(netns, PATH_MAX, "%s", arg);
- }
-
- if (ret <= 0 || ret > PATH_MAX) {
- err("Network namespace name/path %s too long");
- return -E2BIG;
- }
-
- return 0;
+ return -EINVAL;
}
/**
@@ -708,10 +727,13 @@ static unsigned int conf_ip6(unsigned int ifi,
static void usage(const char *name)
{
if (strstr(name, "pasta")) {
- info("Usage: %s [OPTION]... [PID|PATH|NAME]", name);
+ info("Usage: %s [OPTION]... [COMMAND] [ARGS]...", name);
+ info(" %s [OPTION]... PID", name);
+ info(" %s [OPTION]... --netns [PATH|NAME]", name);
info("");
- info("Without PID|PATH|NAME, run the default shell in a new");
- info("network and user namespace, and connect it via pasta.");
+ info("Without PID or --netns, run the given command or a");
+ info("default shell in a new network and user namespace, and");
+ info("connect it via pasta.");
} else {
info("Usage: %s [OPTION]...", name);
}
@@ -858,6 +880,7 @@ pasta_opts:
info( " SPEC is as described above");
info( " default: auto");
info( " --userns NSPATH Target user namespace to join");
+ info( " --netns PATH|NAME Target network namespace to join");
info( " --netns-only Don't join existing user namespace");
info( " implied if PATH or NAME are given without --userns");
info( " --config-net Configure tap interface in namespace");
@@ -1038,6 +1061,7 @@ void conf(struct ctx *c, int argc, char **argv)
{"tcp-ns", required_argument, NULL, 'T' },
{"udp-ns", required_argument, NULL, 'U' },
{"userns", required_argument, NULL, 2 },
+ {"netns", required_argument, NULL, 3 },
{"netns-only", no_argument, &c->netns_only, 1 },
{"config-net", no_argument, &c->pasta_conf_ns, 1 },
{"ns-mac-addr", required_argument, NULL, 4 },
@@ -1091,6 +1115,16 @@ void conf(struct ctx *c, int argc, char **argv)
usage(argv[0]);
}
break;
+ case 3:
+ if (c->mode != MODE_PASTA) {
+ err("--netns is for pasta mode only");
+ usage(argv[0]);
+ }
+
+ ret = conf_netns(netns, optarg);
+ if (ret < 0)
+ usage(argv[0]);
+ break;
case 4:
if (c->mode != MODE_PASTA) {
err("--ns-mac-addr is for pasta mode only");
@@ -1465,11 +1499,12 @@ void conf(struct ctx *c, int argc, char **argv)
check_root(c);
if (c->mode == MODE_PASTA && optind + 1 == argc) {
- ret = conf_ns_opt(userns, netns, argv[optind]);
+ ret = conf_ns_pid(userns, netns, argv[optind]);
if (ret < 0)
usage(argv[0]);
- } else if (c->mode == MODE_PASTA && *userns && optind == argc) {
- err("--userns requires PID, PATH or NAME");
+ } else if (c->mode == MODE_PASTA && *userns
+ && !*netns && optind == argc) {
+ err("--userns requires --netns or PID");
usage(argv[0]);
} else if (optind != argc) {
usage(argv[0]);