diff options
Diffstat (limited to 'src/libsystemd-network/sd-dhcp-client.c')
| -rw-r--r-- | src/libsystemd-network/sd-dhcp-client.c | 324 |
1 files changed, 142 insertions, 182 deletions
diff --git a/src/libsystemd-network/sd-dhcp-client.c b/src/libsystemd-network/sd-dhcp-client.c index ff434f8ce7..2d7ffd22ca 100644 --- a/src/libsystemd-network/sd-dhcp-client.c +++ b/src/libsystemd-network/sd-dhcp-client.c @@ -21,11 +21,13 @@ #include "dhcp-lease-internal.h" #include "dhcp-protocol.h" #include "dns-domain.h" +#include "event-util.h" #include "hostname-util.h" +#include "io-util.h" #include "random-util.h" #include "string-util.h" -#include "util.h" #include "strv.h" +#include "util.h" #define MAX_CLIENT_ID_LEN (sizeof(uint32_t) + MAX_DUID_LEN) /* Arbitrary limit */ #define MAX_MAC_ADDR_LEN CONST_MAX(INFINIBAND_ALEN, ETH_ALEN) @@ -86,7 +88,7 @@ struct sd_dhcp_client { uint32_t mtu; uint32_t xid; usec_t start_time; - unsigned int attempt; + unsigned attempt; usec_t request_sent; sd_event_source *timeout_t1; sd_event_source *timeout_t2; @@ -298,27 +300,22 @@ int sd_dhcp_client_set_client_id( assert_return(data, -EINVAL); assert_return(data_len > 0 && data_len <= MAX_CLIENT_ID_LEN, -EINVAL); - switch (type) { - - case ARPHRD_ETHER: - if (data_len != ETH_ALEN) - return -EINVAL; - break; - - case ARPHRD_INFINIBAND: - if (data_len != INFINIBAND_ALEN) - return -EINVAL; - break; - - default: - break; - } - if (client->client_id_len == data_len + sizeof(client->client_id.type) && client->client_id.type == type && memcmp(&client->client_id.raw.data, data, data_len) == 0) return 0; + /* For hardware types, log debug message about unexpected data length. + * + * Note that infiniband's INFINIBAND_ALEN is 20 bytes long, but only + * last last 8 bytes of the address are stable and suitable to put into + * the client-id. The caller is advised to account for that. */ + if ((type == ARPHRD_ETHER && data_len != ETH_ALEN) || + (type == ARPHRD_INFINIBAND && data_len != 8)) + log_dhcp_client(client, "Changing client ID to hardware type %u with " + "unexpected address length %zu", + type, data_len); + if (!IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED)) { log_dhcp_client(client, "Changing client ID on running DHCP " "client, restarting"); @@ -341,13 +338,15 @@ int sd_dhcp_client_set_client_id( * without further modification. Otherwise, if duid_type is supported, DUID * is set based on that type. Otherwise, an error is returned. */ -static int dhcp_client_set_iaid_duid( +static int dhcp_client_set_iaid_duid_internal( sd_dhcp_client *client, + bool iaid_append, + bool iaid_set, uint32_t iaid, - bool append_iaid, uint16_t duid_type, const void *duid, - size_t duid_len) { + size_t duid_len, + usec_t llt_time) { DHCP_CLIENT_DONT_DESTROY(client); int r; @@ -357,7 +356,7 @@ static int dhcp_client_set_iaid_duid( assert_return(duid_len == 0 || duid != NULL, -EINVAL); if (duid != NULL) { - r = dhcp_validate_duid_len(duid_type, duid_len); + r = dhcp_validate_duid_len(duid_type, duid_len, true); if (r < 0) return r; } @@ -365,34 +364,60 @@ static int dhcp_client_set_iaid_duid( zero(client->client_id); client->client_id.type = 255; - if (append_iaid) { - /* If IAID is not configured, generate it. */ - if (iaid == 0) { + if (iaid_append) { + if (iaid_set) + client->client_id.ns.iaid = htobe32(iaid); + else { r = dhcp_identifier_set_iaid(client->ifindex, client->mac_addr, client->mac_addr_len, + true, &client->client_id.ns.iaid); if (r < 0) return r; - } else - client->client_id.ns.iaid = htobe32(iaid); + } } if (duid != NULL) { client->client_id.ns.duid.type = htobe16(duid_type); memcpy(&client->client_id.ns.duid.raw.data, duid, duid_len); len = sizeof(client->client_id.ns.duid.type) + duid_len; - } else if (duid_type == DUID_TYPE_EN) { - r = dhcp_identifier_set_duid_en(&client->client_id.ns.duid, &len); - if (r < 0) - return r; } else - return -EOPNOTSUPP; + switch (duid_type) { + case DUID_TYPE_LLT: + if (client->mac_addr_len == 0) + return -EOPNOTSUPP; + + r = dhcp_identifier_set_duid_llt(&client->client_id.ns.duid, llt_time, client->mac_addr, client->mac_addr_len, client->arp_type, &len); + if (r < 0) + return r; + break; + case DUID_TYPE_EN: + r = dhcp_identifier_set_duid_en(&client->client_id.ns.duid, &len); + if (r < 0) + return r; + break; + case DUID_TYPE_LL: + if (client->mac_addr_len == 0) + return -EOPNOTSUPP; + + r = dhcp_identifier_set_duid_ll(&client->client_id.ns.duid, client->mac_addr, client->mac_addr_len, client->arp_type, &len); + if (r < 0) + return r; + break; + case DUID_TYPE_UUID: + r = dhcp_identifier_set_duid_uuid(&client->client_id.ns.duid, &len); + if (r < 0) + return r; + break; + default: + return -EINVAL; + } client->client_id_len = sizeof(client->client_id.type) + len + - (append_iaid ? sizeof(client->client_id.ns.iaid) : 0); + (iaid_append ? sizeof(client->client_id.ns.iaid) : 0); if (!IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED)) { - log_dhcp_client(client, "Configured IAID+DUID, restarting."); + log_dhcp_client(client, "Configured %sDUID, restarting.", iaid_append ? "IAID+" : ""); client_stop(client, SD_DHCP_CLIENT_EVENT_STOP); sd_dhcp_client_start(client); } @@ -402,11 +427,20 @@ static int dhcp_client_set_iaid_duid( int sd_dhcp_client_set_iaid_duid( sd_dhcp_client *client, + bool iaid_set, uint32_t iaid, uint16_t duid_type, const void *duid, size_t duid_len) { - return dhcp_client_set_iaid_duid(client, iaid, true, duid_type, duid, duid_len); + return dhcp_client_set_iaid_duid_internal(client, true, iaid_set, iaid, duid_type, duid, duid_len, 0); +} + +int sd_dhcp_client_set_iaid_duid_llt( + sd_dhcp_client *client, + bool iaid_set, + uint32_t iaid, + usec_t llt_time) { + return dhcp_client_set_iaid_duid_internal(client, true, iaid_set, iaid, DUID_TYPE_LLT, NULL, 0, llt_time); } int sd_dhcp_client_set_duid( @@ -414,7 +448,13 @@ int sd_dhcp_client_set_duid( uint16_t duid_type, const void *duid, size_t duid_len) { - return dhcp_client_set_iaid_duid(client, 0, false, duid_type, duid, duid_len); + return dhcp_client_set_iaid_duid_internal(client, false, false, 0, duid_type, duid, duid_len, 0); +} + +int sd_dhcp_client_set_duid_llt( + sd_dhcp_client *client, + usec_t llt_time) { + return dhcp_client_set_iaid_duid_internal(client, false, false, 0, DUID_TYPE_LLT, NULL, 0, llt_time); } int sd_dhcp_client_set_hostname( @@ -506,11 +546,10 @@ static int client_initialize(sd_dhcp_client *client) { client->fd = asynchronous_close(client->fd); - client->timeout_resend = sd_event_source_unref(client->timeout_resend); - - client->timeout_t1 = sd_event_source_unref(client->timeout_t1); - client->timeout_t2 = sd_event_source_unref(client->timeout_t2); - client->timeout_expire = sd_event_source_unref(client->timeout_expire); + (void) event_source_disable(client->timeout_resend); + (void) event_source_disable(client->timeout_t1); + (void) event_source_disable(client->timeout_t2); + (void) event_source_disable(client->timeout_expire); client->attempt = 1; @@ -611,7 +650,8 @@ static int client_message_init( client->client_id.type = 255; - r = dhcp_identifier_set_iaid(client->ifindex, client->mac_addr, client->mac_addr_len, &client->client_id.ns.iaid); + r = dhcp_identifier_set_iaid(client->ifindex, client->mac_addr, client->mac_addr_len, + true, &client->client_id.ns.iaid); if (r < 0) return r; @@ -659,7 +699,7 @@ static int client_message_init( let the server know how large the server may make its DHCP messages. Note (from ConnMan): Some DHCP servers will send bigger DHCP packets - than the defined default size unless the Maximum Messge Size option + than the defined default size unless the Maximum Message Size option is explicitly set RFC3442 "Requirements to Avoid Sizing Constraints": @@ -1024,22 +1064,11 @@ static int client_timeout_resend( next_timeout += (random_u32() & 0x1fffff); - client->timeout_resend = sd_event_source_unref(client->timeout_resend); - - r = sd_event_add_time(client->event, - &client->timeout_resend, - clock_boottime_or_monotonic(), - next_timeout, 10 * USEC_PER_MSEC, - client_timeout_resend, client); - if (r < 0) - goto error; - - r = sd_event_source_set_priority(client->timeout_resend, - client->event_priority); - if (r < 0) - goto error; - - r = sd_event_source_set_description(client->timeout_resend, "dhcp4-resend-timer"); + r = event_reset_time(client->event, &client->timeout_resend, + clock_boottime_or_monotonic(), + next_timeout, 10 * USEC_PER_MSEC, + client_timeout_resend, client, + client->event_priority, "dhcp4-resend-timer", true); if (r < 0) goto error; @@ -1136,31 +1165,16 @@ static int client_initialize_time_events(sd_dhcp_client *client) { assert(client); assert(client->event); - client->timeout_resend = sd_event_source_unref(client->timeout_resend); - if (client->start_delay) { assert_se(sd_event_now(client->event, clock_boottime_or_monotonic(), &usec) >= 0); usec += client->start_delay; } - r = sd_event_add_time(client->event, - &client->timeout_resend, - clock_boottime_or_monotonic(), - usec, 0, - client_timeout_resend, client); - if (r < 0) - goto error; - - r = sd_event_source_set_priority(client->timeout_resend, - client->event_priority); - if (r < 0) - goto error; - - r = sd_event_source_set_description(client->timeout_resend, "dhcp4-resend-timer"); - if (r < 0) - goto error; - -error: + r = event_reset_time(client->event, &client->timeout_resend, + clock_boottime_or_monotonic(), + usec, 0, + client_timeout_resend, client, + client->event_priority, "dhcp4-resend-timer", true); if (r < 0) client_stop(client, r); @@ -1418,13 +1432,14 @@ static int client_set_lease_timeouts(sd_dhcp_client *client) { assert(client->lease); assert(client->lease->lifetime); - client->timeout_t1 = sd_event_source_unref(client->timeout_t1); - client->timeout_t2 = sd_event_source_unref(client->timeout_t2); - client->timeout_expire = sd_event_source_unref(client->timeout_expire); - /* don't set timers for infinite leases */ - if (client->lease->lifetime == 0xffffffff) + if (client->lease->lifetime == 0xffffffff) { + (void) event_source_disable(client->timeout_t1); + (void) event_source_disable(client->timeout_t2); + (void) event_source_disable(client->timeout_expire); + return 0; + } r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now); if (r < 0) @@ -1476,19 +1491,11 @@ static int client_set_lease_timeouts(sd_dhcp_client *client) { } /* arm lifetime timeout */ - r = sd_event_add_time(client->event, &client->timeout_expire, - clock_boottime_or_monotonic(), - lifetime_timeout, 10 * USEC_PER_MSEC, - client_timeout_expire, client); - if (r < 0) - return r; - - r = sd_event_source_set_priority(client->timeout_expire, - client->event_priority); - if (r < 0) - return r; - - r = sd_event_source_set_description(client->timeout_expire, "dhcp4-lifetime"); + r = event_reset_time(client->event, &client->timeout_expire, + clock_boottime_or_monotonic(), + lifetime_timeout, 10 * USEC_PER_MSEC, + client_timeout_expire, client, + client->event_priority, "dhcp4-lifetime", true); if (r < 0) return r; @@ -1500,21 +1507,11 @@ static int client_set_lease_timeouts(sd_dhcp_client *client) { return 0; /* arm T2 timeout */ - r = sd_event_add_time(client->event, - &client->timeout_t2, - clock_boottime_or_monotonic(), - t2_timeout, - 10 * USEC_PER_MSEC, - client_timeout_t2, client); - if (r < 0) - return r; - - r = sd_event_source_set_priority(client->timeout_t2, - client->event_priority); - if (r < 0) - return r; - - r = sd_event_source_set_description(client->timeout_t2, "dhcp4-t2-timeout"); + r = event_reset_time(client->event, &client->timeout_t2, + clock_boottime_or_monotonic(), + t2_timeout, 10 * USEC_PER_MSEC, + client_timeout_t2, client, + client->event_priority, "dhcp4-t2-timeout", true); if (r < 0) return r; @@ -1526,20 +1523,11 @@ static int client_set_lease_timeouts(sd_dhcp_client *client) { return 0; /* arm T1 timeout */ - r = sd_event_add_time(client->event, - &client->timeout_t1, - clock_boottime_or_monotonic(), - t1_timeout, 10 * USEC_PER_MSEC, - client_timeout_t1, client); - if (r < 0) - return r; - - r = sd_event_source_set_priority(client->timeout_t1, - client->event_priority); - if (r < 0) - return r; - - r = sd_event_source_set_description(client->timeout_t1, "dhcp4-t1-timer"); + r = event_reset_time(client->event, &client->timeout_t1, + clock_boottime_or_monotonic(), + t1_timeout, 10 * USEC_PER_MSEC, + client_timeout_t1, client, + client->event_priority, "dhcp4-t1-timer", true); if (r < 0) return r; @@ -1564,26 +1552,14 @@ static int client_handle_message(sd_dhcp_client *client, DHCPMessage *message, i r = client_handle_offer(client, message, len); if (r >= 0) { - client->timeout_resend = - sd_event_source_unref(client->timeout_resend); - client->state = DHCP_STATE_REQUESTING; client->attempt = 1; - r = sd_event_add_time(client->event, - &client->timeout_resend, - clock_boottime_or_monotonic(), - 0, 0, - client_timeout_resend, client); - if (r < 0) - goto error; - - r = sd_event_source_set_priority(client->timeout_resend, - client->event_priority); - if (r < 0) - goto error; - - r = sd_event_source_set_description(client->timeout_resend, "dhcp4-resend-timer"); + r = event_reset_time(client->event, &client->timeout_resend, + clock_boottime_or_monotonic(), + 0, 0, + client_timeout_resend, client, + client->event_priority, "dhcp4-resend-timer", true); if (r < 0) goto error; } else if (r == -ENOMSG) @@ -1600,8 +1576,7 @@ static int client_handle_message(sd_dhcp_client *client, DHCPMessage *message, i r = client_handle_ack(client, message, len); if (r >= 0) { client->start_delay = 0; - client->timeout_resend = - sd_event_source_unref(client->timeout_resend); + (void) event_source_disable(client->timeout_resend); client->receive_message = sd_event_source_unref(client->receive_message); client->fd = asynchronous_close(client->fd); @@ -1641,8 +1616,7 @@ static int client_handle_message(sd_dhcp_client *client, DHCPMessage *message, i } else if (r == -EADDRNOTAVAIL) { /* got a NAK, let's restart the client */ - client->timeout_resend = - sd_event_source_unref(client->timeout_resend); + client_notify(client, SD_DHCP_CLIENT_EVENT_EXPIRED); r = client_initialize(client); if (r < 0) @@ -1809,8 +1783,7 @@ static int client_receive_message_raw( if (!packet) return -ENOMEM; - iov.iov_base = packet; - iov.iov_len = buflen; + iov = IOVEC_MAKE(packet, buflen); len = recvmsg(fd, &msg, 0); if (len < 0) { @@ -1912,33 +1885,17 @@ sd_event *sd_dhcp_client_get_event(sd_dhcp_client *client) { return client->event; } -sd_dhcp_client *sd_dhcp_client_ref(sd_dhcp_client *client) { - - if (!client) - return NULL; - - assert(client->n_ref >= 1); - client->n_ref++; - - return client; -} - -sd_dhcp_client *sd_dhcp_client_unref(sd_dhcp_client *client) { - - if (!client) - return NULL; - - assert(client->n_ref >= 1); - client->n_ref--; - - if (client->n_ref > 0) - return NULL; +static sd_dhcp_client *dhcp_client_free(sd_dhcp_client *client) { + assert(client); log_dhcp_client(client, "FREE"); - client_initialize(client); + client->timeout_resend = sd_event_source_unref(client->timeout_resend); + client->timeout_t1 = sd_event_source_unref(client->timeout_t1); + client->timeout_t2 = sd_event_source_unref(client->timeout_t2); + client->timeout_expire = sd_event_source_unref(client->timeout_expire); - client->receive_message = sd_event_source_unref(client->receive_message); + client_initialize(client); sd_dhcp_client_detach_event(client); @@ -1951,24 +1908,27 @@ sd_dhcp_client *sd_dhcp_client_unref(sd_dhcp_client *client) { return mfree(client); } +DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_dhcp_client, sd_dhcp_client, dhcp_client_free); + int sd_dhcp_client_new(sd_dhcp_client **ret, int anonymize) { _cleanup_(sd_dhcp_client_unrefp) sd_dhcp_client *client = NULL; assert_return(ret, -EINVAL); - client = new0(sd_dhcp_client, 1); + client = new(sd_dhcp_client, 1); if (!client) return -ENOMEM; - client->n_ref = 1; - client->state = DHCP_STATE_INIT; - client->ifindex = -1; - client->fd = -1; - client->attempt = 1; - client->mtu = DHCP_DEFAULT_MIN_SIZE; - client->port = DHCP_PORT_CLIENT; - - client->anonymize = !!anonymize; + *client = (sd_dhcp_client) { + .n_ref = 1, + .state = DHCP_STATE_INIT, + .ifindex = -1, + .fd = -1, + .attempt = 1, + .mtu = DHCP_DEFAULT_MIN_SIZE, + .port = DHCP_PORT_CLIENT, + .anonymize = !!anonymize, + }; /* NOTE: this could be moved to a function. */ if (anonymize) { client->req_opts_size = ELEMENTSOF(default_req_opts_anonymize); |