systemd/src/libsystemd-network/network-internal.c

/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

/***
 This file is part of systemd.

 Copyright (C) 2013 Tom Gundersen <teg@jklm.no>

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <netinet/ether.h>
#include <linux/if.h>
#include <arpa/inet.h>
#include <fnmatch.h>

#include "strv.h"
#include "siphash24.h"
#include "libudev-private.h"
#include "network-internal.h"
#include "log.h"
#include "utf8.h"
#include "util.h"
#include "conf-parser.h"
#include "condition.h"

#define HASH_KEY SD_ID128_MAKE(d3,1e,48,fa,90,fe,4b,4c,9d,af,d5,d7,a1,b1,2e,8a)

int net_get_unique_predictable_data(struct udev_device *device, uint8_t result[8]) {
        size_t l, sz = 0;
        const char *name = NULL, *field = NULL;
        int r;
        uint8_t *v;

        /* fetch some persistent data unique (on this machine) to this device */
        FOREACH_STRING(field, "ID_NET_NAME_ONBOARD", "ID_NET_NAME_SLOT", "ID_NET_NAME_PATH", "ID_NET_NAME_MAC") {
                name = udev_device_get_property_value(device, field);
                if (name)
                        break;
        }

        if (!name)
                return -ENOENT;

        l = strlen(name);
        sz = sizeof(sd_id128_t) + l;
        v = alloca(sz);

        /* fetch some persistent data unique to this machine */
        r = sd_id128_get_machine((sd_id128_t*) v);
        if (r < 0)
                 return r;
        memcpy(v + sizeof(sd_id128_t), name, l);

        /* Let's hash the machine ID plus the device name. We
        * use a fixed, but originally randomly created hash
        * key here. */
        siphash24(result, v, sz, HASH_KEY.bytes);

        return 0;
}

bool net_match_config(const struct ether_addr *match_mac,
                      const char *match_path,
                      const char *match_driver,
                      const char *match_type,
                      const char *match_name,
                      Condition *match_host,
                      Condition *match_virt,
                      Condition *match_kernel,
                      Condition *match_arch,
                      const struct ether_addr *dev_mac,
                      const char *dev_path,
                      const char *dev_parent_driver,
                      const char *dev_driver,
                      const char *dev_type,
                      const char *dev_name) {

        if (match_host && !condition_test_host(match_host))
                return 0;

        if (match_virt && !condition_test_virtualization(match_virt))
                return 0;

        if (match_kernel && !condition_test_kernel_command_line(match_kernel))
                return 0;

        if (match_arch && !condition_test_architecture(match_arch))
                return 0;

        if (match_mac && (!dev_mac || memcmp(match_mac, dev_mac, ETH_ALEN)))
                return 0;

        if (match_path && (!dev_path || fnmatch(match_path, dev_path, 0)))
                return 0;

        if (match_driver) {
                if (dev_parent_driver && !streq(match_driver, dev_parent_driver))
                        return 0;
                else if (!streq_ptr(match_driver, dev_driver))
                        return 0;
        }

        if (match_type && !streq_ptr(match_type, dev_type))
                return 0;

        if (match_name && (!dev_name || fnmatch(match_name, dev_name, 0)))
                return 0;

        return 1;
}

unsigned net_netmask_to_prefixlen(const struct in_addr *addr) {
        assert(addr);

        return 32 - u32ctz(be32toh(addr->s_addr));
}

int config_parse_net_condition(const char *unit,
                               const char *filename,
                               unsigned line,
                               const char *section,
                               unsigned section_line,
                               const char *lvalue,
                               int ltype,
                               const char *rvalue,
                               void *data,
                               void *userdata) {

        ConditionType cond = ltype;
        Condition **ret = data;
        bool negate;
        Condition *c;
        _cleanup_free_ char *s = NULL;

        assert(filename);
        assert(lvalue);
        assert(rvalue);
        assert(data);

        negate = rvalue[0] == '!';
        if (negate)
                rvalue++;

        s = strdup(rvalue);
        if (!s)
                return log_oom();

        c = condition_new(cond, s, false, negate);
        if (!c)
                return log_oom();

        if (*ret)
                condition_free(*ret);

        *ret = c;
        return 0;
}

int config_parse_ifname(const char *unit,
                        const char *filename,
                        unsigned line,
                        const char *section,
                        unsigned section_line,
                        const char *lvalue,
                        int ltype,
                        const char *rvalue,
                        void *data,
                        void *userdata) {

        char **s = data;
        char *n;

        assert(filename);
        assert(lvalue);
        assert(rvalue);
        assert(data);

        n = strdup(rvalue);
        if (!n)
                return log_oom();

        if (!ascii_is_valid(n) || strlen(n) >= IFNAMSIZ) {
                log_syntax(unit, LOG_ERR, filename, line, EINVAL,
                           "Interface name is not ASCII clean or is too long, ignoring assignment: %s", rvalue);
                free(n);
                return 0;
        }

        free(*s);
        if (*n)
                *s = n;
        else {
                free(n);
                *s = NULL;
        }

        return 0;
}

int config_parse_ifalias(const char *unit,
                         const char *filename,
                         unsigned line,
                         const char *section,
                         unsigned section_line,
                         const char *lvalue,
                         int ltype,
                         const char *rvalue,
                         void *data,
                         void *userdata) {

        char **s = data;
        char *n;

        assert(filename);
        assert(lvalue);
        assert(rvalue);
        assert(data);

        n = strdup(rvalue);
        if (!n)
                return log_oom();

        if (!ascii_is_valid(n) || strlen(n) >= IFALIASZ) {
                log_syntax(unit, LOG_ERR, filename, line, EINVAL,
                           "Interface alias is not ASCII clean or is too long, ignoring assignment: %s", rvalue);
                free(n);
                return 0;
        }

        free(*s);
        if (*n)
                *s = n;
        else {
                free(n);
                *s = NULL;
        }

        return 0;
}

int config_parse_hwaddr(const char *unit,
                        const char *filename,
                        unsigned line,
                        const char *section,
                        unsigned section_line,
                        const char *lvalue,
                        int ltype,
                        const char *rvalue,
                        void *data,
                        void *userdata) {
        struct ether_addr **hwaddr = data;
        struct ether_addr *n;
        int r;

        assert(filename);
        assert(lvalue);
        assert(rvalue);
        assert(data);

        n = new0(struct ether_addr, 1);
        if (!n)
                return log_oom();

        r = sscanf(rvalue, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
                   &n->ether_addr_octet[0],
                   &n->ether_addr_octet[1],
                   &n->ether_addr_octet[2],
                   &n->ether_addr_octet[3],
                   &n->ether_addr_octet[4],
                   &n->ether_addr_octet[5]);
        if (r != 6) {
                log_syntax(unit, LOG_ERR, filename, line, EINVAL,
                           "Not a valid MAC address, ignoring assignment: %s", rvalue);
                free(n);
                return 0;
        }

        free(*hwaddr);
        *hwaddr = n;

        return 0;
}

int net_parse_inaddr(const char *address, unsigned char *family, void *dst) {
        int r;

        assert(address);
        assert(family);
        assert(dst);

        /* IPv4 */
        r = inet_pton(AF_INET, address, dst);
        if (r > 0) {
                /* succsefully parsed IPv4 address */
                if (*family == AF_UNSPEC)
                        *family = AF_INET;
                else if (*family != AF_INET)
                        return -EINVAL;
        } else  if (r < 0)
                return -errno;
        else {
                /* not an IPv4 address, so let's try IPv6 */
                r = inet_pton(AF_INET6, address, dst);
                if (r > 0) {
                        /* successfully parsed IPv6 address */
                        if (*family == AF_UNSPEC)
                                *family = AF_INET6;
                        else if (*family != AF_INET6)
                                return -EINVAL;
                } else if (r < 0)
                        return -errno;
                else
                        return -EINVAL;
        }

        return 0;
}