Blame genl/ctrl.c

Packit Service 3880ab
/*
Packit Service 3880ab
 * ctrl.c	generic netlink controller
Packit Service 3880ab
 *
Packit Service 3880ab
 *		This program is free software; you can distribute it and/or
Packit Service 3880ab
 *		modify it under the terms of the GNU General Public License
Packit Service 3880ab
 *		as published by the Free Software Foundation; either version
Packit Service 3880ab
 *		2 of the License, or (at your option) any later version.
Packit Service 3880ab
 *
Packit Service 3880ab
 * Authors:	J Hadi Salim (hadi@cyberus.ca)
Packit Service 3880ab
 *		Johannes Berg (johannes@sipsolutions.net)
Packit Service 3880ab
 */
Packit Service 3880ab
Packit Service 3880ab
#include <stdio.h>
Packit Service 3880ab
#include <stdlib.h>
Packit Service 3880ab
#include <unistd.h>
Packit Service 3880ab
#include <fcntl.h>
Packit Service 3880ab
#include <sys/socket.h>
Packit Service 3880ab
#include <netinet/in.h>
Packit Service 3880ab
#include <arpa/inet.h>
Packit Service 3880ab
#include <string.h>
Packit Service 3880ab
Packit Service 3880ab
#include "utils.h"
Packit Service 3880ab
#include "genl_utils.h"
Packit Service 3880ab
Packit Service 3880ab
#define GENL_MAX_FAM_OPS	256
Packit Service 3880ab
#define GENL_MAX_FAM_GRPS	256
Packit Service 3880ab
Packit Service 3880ab
static int usage(void)
Packit Service 3880ab
{
Packit Service 3880ab
	fprintf(stderr,"Usage: ctrl <CMD>\n" \
Packit Service 3880ab
		       "CMD   := get <PARMS> | list | monitor\n" \
Packit Service 3880ab
		       "PARMS := name <name> | id <id>\n" \
Packit Service 3880ab
		       "Examples:\n" \
Packit Service 3880ab
		       "\tctrl ls\n" \
Packit Service 3880ab
		       "\tctrl monitor\n" \
Packit Service 3880ab
		       "\tctrl get name foobar\n" \
Packit Service 3880ab
		       "\tctrl get id 0xF\n");
Packit Service 3880ab
	return -1;
Packit Service 3880ab
}
Packit Service 3880ab
Packit Service 3880ab
static void print_ctrl_cmd_flags(FILE *fp, __u32 fl)
Packit Service 3880ab
{
Packit Service 3880ab
	fprintf(fp, "\n\t\tCapabilities (0x%x):\n ", fl);
Packit Service 3880ab
	if (!fl) {
Packit Service 3880ab
		fprintf(fp, "\n");
Packit Service 3880ab
		return;
Packit Service 3880ab
	}
Packit Service 3880ab
	fprintf(fp, "\t\t ");
Packit Service 3880ab
Packit Service 3880ab
	if (fl & GENL_ADMIN_PERM)
Packit Service 3880ab
		fprintf(fp, " requires admin permission;");
Packit Service 3880ab
	if (fl & GENL_CMD_CAP_DO)
Packit Service 3880ab
		fprintf(fp, " can doit;");
Packit Service 3880ab
	if (fl & GENL_CMD_CAP_DUMP)
Packit Service 3880ab
		fprintf(fp, " can dumpit;");
Packit Service 3880ab
	if (fl & GENL_CMD_CAP_HASPOL)
Packit Service 3880ab
		fprintf(fp, " has policy");
Packit Service 3880ab
Packit Service 3880ab
	fprintf(fp, "\n");
Packit Service 3880ab
}
Packit Service 3880ab
Packit Service 3880ab
static int print_ctrl_cmds(FILE *fp, struct rtattr *arg, __u32 ctrl_ver)
Packit Service 3880ab
{
Packit Service 3880ab
	struct rtattr *tb[CTRL_ATTR_OP_MAX + 1];
Packit Service 3880ab
Packit Service 3880ab
	if (arg == NULL)
Packit Service 3880ab
		return -1;
Packit Service 3880ab
Packit Service 3880ab
	parse_rtattr_nested(tb, CTRL_ATTR_OP_MAX, arg);
Packit Service 3880ab
	if (tb[CTRL_ATTR_OP_ID]) {
Packit Service 3880ab
		__u32 *id = RTA_DATA(tb[CTRL_ATTR_OP_ID]);
Packit Service 3880ab
		fprintf(fp, " ID-0x%x ",*id);
Packit Service 3880ab
	}
Packit Service 3880ab
	/* we are only gonna do this for newer version of the controller */
Packit Service 3880ab
	if (tb[CTRL_ATTR_OP_FLAGS] && ctrl_ver >= 0x2) {
Packit Service 3880ab
		__u32 *fl = RTA_DATA(tb[CTRL_ATTR_OP_FLAGS]);
Packit Service 3880ab
		print_ctrl_cmd_flags(fp, *fl);
Packit Service 3880ab
	}
Packit Service 3880ab
	return 0;
Packit Service 3880ab
Packit Service 3880ab
}
Packit Service 3880ab
Packit Service 3880ab
static int print_ctrl_grp(FILE *fp, struct rtattr *arg, __u32 ctrl_ver)
Packit Service 3880ab
{
Packit Service 3880ab
	struct rtattr *tb[CTRL_ATTR_MCAST_GRP_MAX + 1];
Packit Service 3880ab
Packit Service 3880ab
	if (arg == NULL)
Packit Service 3880ab
		return -1;
Packit Service 3880ab
Packit Service 3880ab
	parse_rtattr_nested(tb, CTRL_ATTR_MCAST_GRP_MAX, arg);
Packit Service 3880ab
	if (tb[2]) {
Packit Service 3880ab
		__u32 *id = RTA_DATA(tb[CTRL_ATTR_MCAST_GRP_ID]);
Packit Service 3880ab
		fprintf(fp, " ID-0x%x ",*id);
Packit Service 3880ab
	}
Packit Service 3880ab
	if (tb[1]) {
Packit Service 3880ab
		char *name = RTA_DATA(tb[CTRL_ATTR_MCAST_GRP_NAME]);
Packit Service 3880ab
		fprintf(fp, " name: %s ", name);
Packit Service 3880ab
	}
Packit Service 3880ab
	return 0;
Packit Service 3880ab
Packit Service 3880ab
}
Packit Service 3880ab
Packit Service 3880ab
/*
Packit Service 3880ab
 * The controller sends one nlmsg per family
Packit Service 3880ab
*/
Packit Service 3880ab
static int print_ctrl(struct rtnl_ctrl_data *ctrl,
Packit Service 3880ab
		      struct nlmsghdr *n, void *arg)
Packit Service 3880ab
{
Packit Service 3880ab
	struct rtattr *tb[CTRL_ATTR_MAX + 1];
Packit Service 3880ab
	struct genlmsghdr *ghdr = NLMSG_DATA(n);
Packit Service 3880ab
	int len = n->nlmsg_len;
Packit Service 3880ab
	struct rtattr *attrs;
Packit Service 3880ab
	FILE *fp = (FILE *) arg;
Packit Service 3880ab
	__u32 ctrl_v = 0x1;
Packit Service 3880ab
Packit Service 3880ab
	if (n->nlmsg_type !=  GENL_ID_CTRL) {
Packit Service 3880ab
		fprintf(stderr, "Not a controller message, nlmsg_len=%d "
Packit Service 3880ab
			"nlmsg_type=0x%x\n", n->nlmsg_len, n->nlmsg_type);
Packit Service 3880ab
		return 0;
Packit Service 3880ab
	}
Packit Service 3880ab
Packit Service 3880ab
	if (ghdr->cmd != CTRL_CMD_GETFAMILY &&
Packit Service 3880ab
	    ghdr->cmd != CTRL_CMD_DELFAMILY &&
Packit Service 3880ab
	    ghdr->cmd != CTRL_CMD_NEWFAMILY &&
Packit Service 3880ab
	    ghdr->cmd != CTRL_CMD_NEWMCAST_GRP &&
Packit Service 3880ab
	    ghdr->cmd != CTRL_CMD_DELMCAST_GRP) {
Packit Service 3880ab
		fprintf(stderr, "Unknown controller command %d\n", ghdr->cmd);
Packit Service 3880ab
		return 0;
Packit Service 3880ab
	}
Packit Service 3880ab
Packit Service 3880ab
	len -= NLMSG_LENGTH(GENL_HDRLEN);
Packit Service 3880ab
Packit Service 3880ab
	if (len < 0) {
Packit Service 3880ab
		fprintf(stderr, "wrong controller message len %d\n", len);
Packit Service 3880ab
		return -1;
Packit Service 3880ab
	}
Packit Service 3880ab
Packit Service 3880ab
	attrs = (struct rtattr *) ((char *) ghdr + GENL_HDRLEN);
Packit Service 3880ab
	parse_rtattr(tb, CTRL_ATTR_MAX, attrs, len);
Packit Service 3880ab
Packit Service 3880ab
	if (tb[CTRL_ATTR_FAMILY_NAME]) {
Packit Service 3880ab
		char *name = RTA_DATA(tb[CTRL_ATTR_FAMILY_NAME]);
Packit Service 3880ab
		fprintf(fp, "\nName: %s\n",name);
Packit Service 3880ab
	}
Packit Service 3880ab
	if (tb[CTRL_ATTR_FAMILY_ID]) {
Packit Service 3880ab
		__u16 *id = RTA_DATA(tb[CTRL_ATTR_FAMILY_ID]);
Packit Service 3880ab
		fprintf(fp, "\tID: 0x%x ",*id);
Packit Service 3880ab
	}
Packit Service 3880ab
	if (tb[CTRL_ATTR_VERSION]) {
Packit Service 3880ab
		__u32 *v = RTA_DATA(tb[CTRL_ATTR_VERSION]);
Packit Service 3880ab
		fprintf(fp, " Version: 0x%x ",*v);
Packit Service 3880ab
		ctrl_v = *v;
Packit Service 3880ab
	}
Packit Service 3880ab
	if (tb[CTRL_ATTR_HDRSIZE]) {
Packit Service 3880ab
		__u32 *h = RTA_DATA(tb[CTRL_ATTR_HDRSIZE]);
Packit Service 3880ab
		fprintf(fp, " header size: %d ",*h);
Packit Service 3880ab
	}
Packit Service 3880ab
	if (tb[CTRL_ATTR_MAXATTR]) {
Packit Service 3880ab
		__u32 *ma = RTA_DATA(tb[CTRL_ATTR_MAXATTR]);
Packit Service 3880ab
		fprintf(fp, " max attribs: %d ",*ma);
Packit Service 3880ab
	}
Packit Service 3880ab
	/* end of family definitions .. */
Packit Service 3880ab
	fprintf(fp,"\n");
Packit Service 3880ab
	if (tb[CTRL_ATTR_OPS]) {
Packit Service 3880ab
		struct rtattr *tb2[GENL_MAX_FAM_OPS];
Packit Service 3880ab
		int i=0;
Packit Service 3880ab
		parse_rtattr_nested(tb2, GENL_MAX_FAM_OPS, tb[CTRL_ATTR_OPS]);
Packit Service 3880ab
		fprintf(fp, "\tcommands supported: \n");
Packit Service 3880ab
		for (i = 0; i < GENL_MAX_FAM_OPS; i++) {
Packit Service 3880ab
			if (tb2[i]) {
Packit Service 3880ab
				fprintf(fp, "\t\t#%d: ", i);
Packit Service 3880ab
				if (0 > print_ctrl_cmds(fp, tb2[i], ctrl_v)) {
Packit Service 3880ab
					fprintf(fp, "Error printing command\n");
Packit Service 3880ab
				}
Packit Service 3880ab
				/* for next command */
Packit Service 3880ab
				fprintf(fp,"\n");
Packit Service 3880ab
			}
Packit Service 3880ab
		}
Packit Service 3880ab
Packit Service 3880ab
		/* end of family::cmds definitions .. */
Packit Service 3880ab
		fprintf(fp,"\n");
Packit Service 3880ab
	}
Packit Service 3880ab
Packit Service 3880ab
	if (tb[CTRL_ATTR_MCAST_GROUPS]) {
Packit Service 3880ab
		struct rtattr *tb2[GENL_MAX_FAM_GRPS + 1];
Packit Service 3880ab
		int i;
Packit Service 3880ab
Packit Service 3880ab
		parse_rtattr_nested(tb2, GENL_MAX_FAM_GRPS,
Packit Service 3880ab
				    tb[CTRL_ATTR_MCAST_GROUPS]);
Packit Service 3880ab
		fprintf(fp, "\tmulticast groups:\n");
Packit Service 3880ab
Packit Service 3880ab
		for (i = 0; i < GENL_MAX_FAM_GRPS; i++) {
Packit Service 3880ab
			if (tb2[i]) {
Packit Service 3880ab
				fprintf(fp, "\t\t#%d: ", i);
Packit Service 3880ab
				if (0 > print_ctrl_grp(fp, tb2[i], ctrl_v))
Packit Service 3880ab
					fprintf(fp, "Error printing group\n");
Packit Service 3880ab
				/* for next group */
Packit Service 3880ab
				fprintf(fp,"\n");
Packit Service 3880ab
			}
Packit Service 3880ab
		}
Packit Service 3880ab
Packit Service 3880ab
		/* end of family::groups definitions .. */
Packit Service 3880ab
		fprintf(fp,"\n");
Packit Service 3880ab
	}
Packit Service 3880ab
Packit Service 3880ab
	fflush(fp);
Packit Service 3880ab
	return 0;
Packit Service 3880ab
}
Packit Service 3880ab
Packit Service 3880ab
static int print_ctrl2(struct nlmsghdr *n, void *arg)
Packit Service 3880ab
{
Packit Service 3880ab
	return print_ctrl(NULL, n, arg);
Packit Service 3880ab
}
Packit Service 3880ab
Packit Service 3880ab
static int ctrl_list(int cmd, int argc, char **argv)
Packit Service 3880ab
{
Packit Service 3880ab
	struct rtnl_handle rth;
Packit Service 3880ab
	int ret = -1;
Packit Service 3880ab
	char d[GENL_NAMSIZ];
Packit Service 3880ab
	struct {
Packit Service 3880ab
		struct nlmsghdr         n;
Packit Service 3880ab
		struct genlmsghdr	g;
Packit Service 3880ab
		char                    buf[4096];
Packit Service 3880ab
	} req = {
Packit Service 3880ab
		.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN),
Packit Service 3880ab
		.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK,
Packit Service 3880ab
		.n.nlmsg_type = GENL_ID_CTRL,
Packit Service 3880ab
		.g.cmd = CTRL_CMD_GETFAMILY,
Packit Service 3880ab
	};
Packit Service 3880ab
	struct nlmsghdr *nlh = &req.n;
Packit Service 3880ab
	struct nlmsghdr *answer = NULL;
Packit Service 3880ab
Packit Service 3880ab
	if (rtnl_open_byproto(&rth, 0, NETLINK_GENERIC) < 0) {
Packit Service 3880ab
		fprintf(stderr, "Cannot open generic netlink socket\n");
Packit Service 3880ab
		exit(1);
Packit Service 3880ab
	}
Packit Service 3880ab
Packit Service 3880ab
	if (cmd == CTRL_CMD_GETFAMILY) {
Packit Service 3880ab
		if (argc != 2) {
Packit Service 3880ab
			fprintf(stderr, "Wrong number of params\n");
Packit Service 3880ab
			return -1;
Packit Service 3880ab
		}
Packit Service 3880ab
Packit Service 3880ab
		if (matches(*argv, "name") == 0) {
Packit Service 3880ab
			NEXT_ARG();
Packit Service 3880ab
			strlcpy(d, *argv, sizeof(d));
Packit Service 3880ab
			addattr_l(nlh, 128, CTRL_ATTR_FAMILY_NAME,
Packit Service 3880ab
				  d, strlen(d) + 1);
Packit Service 3880ab
		} else if (matches(*argv, "id") == 0) {
Packit Service 3880ab
			__u16 id;
Packit Service 3880ab
			NEXT_ARG();
Packit Service 3880ab
			if (get_u16(&id, *argv, 0)) {
Packit Service 3880ab
				fprintf(stderr, "Illegal \"id\"\n");
Packit Service 3880ab
				goto ctrl_done;
Packit Service 3880ab
			}
Packit Service 3880ab
Packit Service 3880ab
			addattr_l(nlh, 128, CTRL_ATTR_FAMILY_ID, &id, 2);
Packit Service 3880ab
Packit Service 3880ab
		} else {
Packit Service 3880ab
			fprintf(stderr, "Wrong params\n");
Packit Service 3880ab
			goto ctrl_done;
Packit Service 3880ab
		}
Packit Service 3880ab
Packit Service 3880ab
		if (rtnl_talk(&rth, nlh, &answer) < 0) {
Packit Service 3880ab
			fprintf(stderr, "Error talking to the kernel\n");
Packit Service 3880ab
			goto ctrl_done;
Packit Service 3880ab
		}
Packit Service 3880ab
Packit Service 3880ab
		if (print_ctrl2(answer, (void *) stdout) < 0) {
Packit Service 3880ab
			fprintf(stderr, "Dump terminated\n");
Packit Service 3880ab
			goto ctrl_done;
Packit Service 3880ab
		}
Packit Service 3880ab
Packit Service 3880ab
	}
Packit Service 3880ab
Packit Service 3880ab
	if (cmd == CTRL_CMD_UNSPEC) {
Packit Service 3880ab
		nlh->nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST;
Packit Service 3880ab
		nlh->nlmsg_seq = rth.dump = ++rth.seq;
Packit Service 3880ab
Packit Service 3880ab
		if (rtnl_send(&rth, nlh, nlh->nlmsg_len) < 0) {
Packit Service 3880ab
			perror("Failed to send dump request\n");
Packit Service 3880ab
			goto ctrl_done;
Packit Service 3880ab
		}
Packit Service 3880ab
Packit Service 3880ab
		rtnl_dump_filter(&rth, print_ctrl2, stdout);
Packit Service 3880ab
Packit Service 3880ab
        }
Packit Service 3880ab
Packit Service 3880ab
	ret = 0;
Packit Service 3880ab
ctrl_done:
Packit Service 3880ab
	free(answer);
Packit Service 3880ab
	rtnl_close(&rth);
Packit Service 3880ab
	return ret;
Packit Service 3880ab
}
Packit Service 3880ab
Packit Service 3880ab
static int ctrl_listen(int argc, char **argv)
Packit Service 3880ab
{
Packit Service 3880ab
	struct rtnl_handle rth;
Packit Service 3880ab
Packit Service 3880ab
	if (rtnl_open_byproto(&rth, nl_mgrp(GENL_ID_CTRL), NETLINK_GENERIC) < 0) {
Packit Service 3880ab
		fprintf(stderr, "Canot open generic netlink socket\n");
Packit Service 3880ab
		return -1;
Packit Service 3880ab
	}
Packit Service 3880ab
Packit Service 3880ab
	if (rtnl_listen(&rth, print_ctrl, (void *) stdout) < 0)
Packit Service 3880ab
		return -1;
Packit Service 3880ab
Packit Service 3880ab
	return 0;
Packit Service 3880ab
}
Packit Service 3880ab
Packit Service 3880ab
static int parse_ctrl(struct genl_util *a, int argc, char **argv)
Packit Service 3880ab
{
Packit Service 3880ab
	argv++;
Packit Service 3880ab
	if (--argc <= 0) {
Packit Service 3880ab
		fprintf(stderr, "wrong controller params\n");
Packit Service 3880ab
		return -1;
Packit Service 3880ab
	}
Packit Service 3880ab
Packit Service 3880ab
	if (matches(*argv, "monitor") == 0)
Packit Service 3880ab
		return ctrl_listen(argc-1, argv+1);
Packit Service 3880ab
	if (matches(*argv, "get") == 0)
Packit Service 3880ab
		return ctrl_list(CTRL_CMD_GETFAMILY, argc-1, argv+1);
Packit Service 3880ab
	if (matches(*argv, "list") == 0 ||
Packit Service 3880ab
	    matches(*argv, "show") == 0 ||
Packit Service 3880ab
	    matches(*argv, "lst") == 0)
Packit Service 3880ab
		return ctrl_list(CTRL_CMD_UNSPEC, argc-1, argv+1);
Packit Service 3880ab
	if (matches(*argv, "help") == 0)
Packit Service 3880ab
		return usage();
Packit Service 3880ab
Packit Service 3880ab
	fprintf(stderr, "ctrl command \"%s\" is unknown, try \"ctrl help\".\n",
Packit Service 3880ab
		*argv);
Packit Service 3880ab
Packit Service 3880ab
	return -1;
Packit Service 3880ab
}
Packit Service 3880ab
Packit Service 3880ab
struct genl_util ctrl_genl_util = {
Packit Service 3880ab
	.name = "ctrl",
Packit Service 3880ab
	.parse_genlopt = parse_ctrl,
Packit Service 3880ab
	.print_genlopt = print_ctrl2,
Packit Service 3880ab
};