From c07aeadfeabc2fa5bc58d7f41d79e2310d33d595 Mon Sep 17 00:00:00 2001 From: Tom Gundersen Date: Fri, 31 Jan 2014 03:10:27 +0100 Subject: networkd: dhcp - refactor handler --- src/network/networkd-link.c | 294 +++++++++++++++++++++++++------------------- 1 file changed, 168 insertions(+), 126 deletions(-) (limited to 'src') diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c index 363602e962..0a363b2547 100644 --- a/src/network/networkd-link.c +++ b/src/network/networkd-link.c @@ -410,175 +410,217 @@ static int link_set_mtu(Link *link, uint32_t mtu) { return 0; } -static void dhcp_handler(sd_dhcp_client *client, int event, void *userdata) { - Link *link = userdata; - struct in_addr address; - struct in_addr netmask; - struct in_addr gateway; - unsigned prefixlen; +static int dhcp_lease_lost(sd_dhcp_client *client, Link *link) { int r; + assert(client); assert(link); - assert(link->network); - assert(link->manager); - if (link->state == LINK_STATE_FAILED) - return; + if (link->dhcp_address) { + address_drop(link->dhcp_address, link, address_drop_handler); - if (event < 0) { - log_warning_link(link, "DHCP error: %s", strerror(-event)); - link_enter_failed(link); - return; + address_free(link->dhcp_address); + link->dhcp_address = NULL; } - if (event == DHCP_EVENT_NO_LEASE) - log_debug_link(link, "IP address in use."); - - if (event == DHCP_EVENT_IP_CHANGE || event == DHCP_EVENT_EXPIRED || - event == DHCP_EVENT_STOP) { - if (link->network->dhcp_critical) { - log_warning_link(link, "DHCPv4 connection considered system critical, " - "ignoring request to reconfigure it down."); - return; - } + if (link->dhcp_route) { + route_free(link->dhcp_route); + link->dhcp_route = NULL; + } - if (link->dhcp_address) { - address_drop(link->dhcp_address, link, address_drop_handler); + if (link->network->dhcp_mtu) { + uint16_t mtu; - address_free(link->dhcp_address); - link->dhcp_address = NULL; + r = sd_dhcp_client_get_mtu(client, &mtu); + if (r >= 0 && link->original_mtu != mtu) { + r = link_set_mtu(link, link->original_mtu); + if (r < 0) { + log_warning_link(link, "DHCP error: could not reset MTU"); + link_enter_failed(link); + return r; + } } + } - if (link->dhcp_route) { - route_free(link->dhcp_route); - link->dhcp_route = NULL; - } + if (link->network->dhcp_hostname) { + r = set_hostname(link->manager->bus, ""); + if (r < 0) + log_error("Failed to reset transient hostname"); + } - if (link->network->dhcp_mtu) { - uint16_t mtu; + return 0; +} - r = sd_dhcp_client_get_mtu(client, &mtu); - if (r >= 0 && link->original_mtu != mtu) { - r = link_set_mtu(link, link->original_mtu); - if (r < 0) { - log_warning_link(link, "DHCP error: could not reset MTU"); - link_enter_failed(link); - return; - } - } - } +static int dhcp_lease_acquired(sd_dhcp_client *client, Link *link) { + struct in_addr address; + struct in_addr netmask; + struct in_addr gateway; + unsigned prefixlen; + _cleanup_address_free_ Address *addr = NULL; + _cleanup_route_free_ Route *rt = NULL; + struct in_addr *nameservers; + size_t nameservers_size; + int r; - if (link->network->dhcp_hostname) { - r = set_hostname(link->manager->bus, ""); - if (r < 0) - log_error("Failed to reset transient hostname"); - } - } + assert(client); + assert(link); r = sd_dhcp_client_get_address(client, &address); if (r < 0) { - log_warning_link(link, "DHCP error: no address"); - link_enter_failed(link); - return; + log_warning_link(link, "DHCP error: no address: %s", + strerror(-r)); + return r; } r = sd_dhcp_client_get_netmask(client, &netmask); if (r < 0) { - log_warning_link(link, "DHCP error: no netmask"); - link_enter_failed(link); - return; + log_warning_link(link, "DHCP error: no netmask: %s", + strerror(-r)); + return r; } prefixlen = net_netmask_to_prefixlen(&netmask); r = sd_dhcp_client_get_router(client, &gateway); if (r < 0) { - log_warning_link(link, "DHCP error: no router"); - link_enter_failed(link); - return; + log_warning_link(link, "DHCP error: no router: %s", + strerror(-r)); + return r; } - if (event == DHCP_EVENT_IP_CHANGE || event == DHCP_EVENT_IP_ACQUIRE) { - _cleanup_address_free_ Address *addr = NULL; - _cleanup_route_free_ Route *rt = NULL; - struct in_addr *nameservers; - size_t nameservers_size; - - log_struct_link(LOG_INFO, link, - "MESSAGE=%s: DHCPv4 address %u.%u.%u.%u/%u via %u.%u.%u.%u", - link->ifname, - ADDRESS_FMT_VAL(address), - prefixlen, - ADDRESS_FMT_VAL(gateway), - "ADDRESS=%u.%u.%u.%u", - ADDRESS_FMT_VAL(address), - "PREFIXLEN=%u", - prefixlen, - "GATEWAY=%u.%u.%u.%u", - ADDRESS_FMT_VAL(gateway), - NULL); - r = address_new_dynamic(&addr); - if (r < 0) { - log_error_link(link, "Could not allocate address"); - link_enter_failed(link); - return; - } + log_struct_link(LOG_INFO, link, + "MESSAGE=%s: DHCPv4 address %u.%u.%u.%u/%u via %u.%u.%u.%u", + link->ifname, + ADDRESS_FMT_VAL(address), + prefixlen, + ADDRESS_FMT_VAL(gateway), + "ADDRESS=%u.%u.%u.%u", + ADDRESS_FMT_VAL(address), + "PREFIXLEN=%u", + prefixlen, + "GATEWAY=%u.%u.%u.%u", + ADDRESS_FMT_VAL(gateway), + NULL); - addr->family = AF_INET; - addr->in_addr.in = address; - addr->prefixlen = prefixlen; - addr->broadcast.s_addr = address.s_addr | ~netmask.s_addr; + r = address_new_dynamic(&addr); + if (r < 0) { + log_error_link(link, "Could not allocate address: %s", + strerror(-r)); + return r; + } - r = route_new_dynamic(&rt); - if (r < 0) { - log_error_link(link, "Could not allocate route"); - link_enter_failed(link); - return; + addr->family = AF_INET; + addr->in_addr.in = address; + addr->prefixlen = prefixlen; + addr->broadcast.s_addr = address.s_addr | ~netmask.s_addr; + + r = route_new_dynamic(&rt); + if (r < 0) { + log_error_link(link, "Could not allocate route: %s", + strerror(-r)); + return r; + } + + rt->family = AF_INET; + rt->in_addr.in = gateway; + + link->dhcp_address = addr; + link->dhcp_route = rt; + addr = NULL; + rt = NULL; + + if (link->network->dhcp_dns) { + r = sd_dhcp_client_get_dns(client, &nameservers, &nameservers_size); + if (r >= 0) { + r = manager_update_resolv_conf(link->manager); + if (r < 0) + log_error("Failed to update resolv.conf"); } + } + + if (link->network->dhcp_mtu) { + uint16_t mtu; - rt->family = AF_INET; - rt->in_addr.in = gateway; + r = sd_dhcp_client_get_mtu(client, &mtu); + if (r >= 0) { + r = link_set_mtu(link, mtu); + if (r < 0) + log_error_link(link, "Failed to set MTU " + "to %" PRIu16, mtu); + } + } - link->dhcp_address = addr; - link->dhcp_route = rt; - addr = NULL; - rt = NULL; + if (link->network->dhcp_hostname) { + const char *hostname; - if (link->network->dhcp_dns) { - r = sd_dhcp_client_get_dns(client, &nameservers, &nameservers_size); - if (r >= 0) { - r = manager_update_resolv_conf(link->manager); - if (r < 0) - log_error("Failed to update resolv.conf"); - } + r = sd_dhcp_client_get_hostname(client, &hostname); + if (r >= 0) { + r = set_hostname(link->manager->bus, hostname); + if (r < 0) + log_error("Failed to set transient hostname " + "to '%s'", hostname); } + } - if (link->network->dhcp_mtu) { - uint16_t mtu; - - r = sd_dhcp_client_get_mtu(client, &mtu); - if (r >= 0) { - r = link_set_mtu(link, mtu); - if (r < 0) - log_error_link(link, "Failed to set MTU " - "to %" PRIu16, mtu); + link_enter_set_addresses(link); + + return 0; +} + +static void dhcp_handler(sd_dhcp_client *client, int event, void *userdata) { + Link *link = userdata; + int r; + + assert(link); + assert(link->network); + assert(link->manager); + + if (link->state == LINK_STATE_FAILED) + return; + + switch (event) { + case DHCP_EVENT_NO_LEASE: + log_debug_link(link, "IP address in use."); + break; + case DHCP_EVENT_EXPIRED: + case DHCP_EVENT_STOP: + case DHCP_EVENT_IP_CHANGE: + if (link->network->dhcp_critical) { + log_error_link(link, "DHCPv4 connection considered system critical, " + "ignoring request to reconfigure it."); + return; } - } - if (link->network->dhcp_hostname) { - const char *hostname; + r = dhcp_lease_lost(client, link); + if (r < 0) { + link_enter_failed(link); + return; + } - r = sd_dhcp_client_get_hostname(client, &hostname); - if (r >= 0) { - r = set_hostname(link->manager->bus, hostname); - if (r < 0) - log_error("Failed to set transient hostname " - "to '%s'", hostname); + if (event == DHCP_EVENT_IP_CHANGE) { + r = dhcp_lease_acquired(client, link); + if (r < 0) { + link_enter_failed(link); + return; + } } - } - link_enter_set_addresses(link); + break; + case DHCP_EVENT_IP_ACQUIRE: + r = dhcp_lease_acquired(client, link); + if (r < 0) { + link_enter_failed(link); + return; + } + break; + default: + if (event < 0) + log_warning_link(link, "DHCP error: %s", strerror(-event)); + else + log_warning_link(link, "DHCP unknown event: %d", event); + link_enter_failed(link); + break; } return; -- cgit v1.2.3-54-g00ecf