diff options
Diffstat (limited to 'extras/libmemif/src/socket.c')
| -rw-r--r-- | extras/libmemif/src/socket.c | 883 |
1 files changed, 883 insertions, 0 deletions
diff --git a/extras/libmemif/src/socket.c b/extras/libmemif/src/socket.c new file mode 100644 index 00000000000..9c9b3a8dd73 --- /dev/null +++ b/extras/libmemif/src/socket.c @@ -0,0 +1,883 @@ +/* + *------------------------------------------------------------------ + * Copyright (c) 2017 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + *------------------------------------------------------------------ + */ + +#define _GNU_SOURCE +#include <sys/socket.h> +#include <sys/types.h> +#include <sys/un.h> +#include <string.h> +#include <stdio.h> +#include <stdlib.h> +#include <net/if.h> +#include <sys/ioctl.h> +#include <sys/uio.h> +#include <sys/mman.h> +#include <sys/prctl.h> +#include <fcntl.h> +#include <errno.h> + +#include <socket.h> +#include <memif.h> + +#define memif_min(a,b) ((a < b) ? (a) : (b)) + +/* sends msg to socket */ +static_fn int +memif_msg_send (int fd, memif_msg_t * msg, int afd) +{ + struct msghdr mh = { 0 }; + struct iovec iov[1]; + char ctl[CMSG_SPACE (sizeof (int))]; + int rv, err = MEMIF_ERR_SUCCESS; /* 0 */ + + iov[0].iov_base = (void *) msg; + iov[0].iov_len = sizeof (memif_msg_t); + mh.msg_iov = iov; + mh.msg_iovlen = 1; + + if (afd > 0) + { + struct cmsghdr *cmsg; + memset (&ctl, 0, sizeof (ctl)); + mh.msg_control = ctl; + mh.msg_controllen = sizeof (ctl); + cmsg = CMSG_FIRSTHDR (&mh); + cmsg->cmsg_len = CMSG_LEN (sizeof (int)); + cmsg->cmsg_level = SOL_SOCKET; + cmsg->cmsg_type = SCM_RIGHTS; + memcpy (CMSG_DATA (cmsg), &afd, sizeof (int)); + } + rv = sendmsg (fd, &mh, 0); + if (rv < 0) + err = memif_syscall_error_handler (errno); + DBG ("Message type %u sent", msg->type); + return err; +} + +/* response from memif master - master is ready to handle next message */ +static_fn int +memif_msg_enq_ack (memif_connection_t * c) +{ + memif_msg_queue_elt_t *e = + (memif_msg_queue_elt_t *) malloc (sizeof (memif_msg_queue_elt_t)); + if (e == NULL) + return memif_syscall_error_handler (errno); + + memset (&e->msg, 0, sizeof (e->msg)); + e->msg.type = MEMIF_MSG_TYPE_ACK; + e->fd = -1; + + e->next = NULL; + if (c->msg_queue == NULL) + { + c->msg_queue = e; + return MEMIF_ERR_SUCCESS; /* 0 */ + } + + memif_msg_queue_elt_t *cur = c->msg_queue; + while (cur->next != NULL) + { + cur = cur->next; + } + cur->next = e; + + return MEMIF_ERR_SUCCESS; /* 0 */ +} + +static_fn int +memif_msg_send_hello (int fd) +{ + libmemif_main_t *lm = &libmemif_main; + memif_msg_t msg = { 0 }; + memif_msg_hello_t *h = &msg.hello; + msg.type = MEMIF_MSG_TYPE_HELLO; + h->min_version = MEMIF_VERSION; + h->max_version = MEMIF_VERSION; + h->max_s2m_ring = MEMIF_MAX_M2S_RING; + h->max_m2s_ring = MEMIF_MAX_M2S_RING; + h->max_region = MEMIF_MAX_REGION; + h->max_log2_ring_size = MEMIF_MAX_LOG2_RING_SIZE; + + strncpy ((char *) h->name, lm->app_name, strlen (lm->app_name)); + + /* msg hello is not enqueued but sent directly, + because it is the first msg to be sent */ + return memif_msg_send (fd, &msg, -1); +} + +/* send id and secret (optional) for interface identification */ +static_fn int +memif_msg_enq_init (memif_connection_t * c) +{ + memif_msg_queue_elt_t *e = + (memif_msg_queue_elt_t *) malloc (sizeof (memif_msg_queue_elt_t)); + if (e == NULL) + return memif_syscall_error_handler (errno); + memset (e, 0, sizeof (memif_msg_queue_elt_t)); + + memset (&e->msg, 0, sizeof (e->msg)); + memif_msg_init_t *i = &e->msg.init; + + e->msg.type = MEMIF_MSG_TYPE_INIT; + e->fd = -1; + i->version = MEMIF_VERSION; + i->id = c->args.interface_id; + i->mode = c->args.mode; + + strncpy ((char *) i->name, (char *) c->args.instance_name, + strlen ((char *) c->args.instance_name)); + if (c->args.secret) + strncpy ((char *) i->secret, (char *) c->args.secret, sizeof (i->secret)); + + e->next = NULL; + if (c->msg_queue == NULL) + { + c->msg_queue = e; + return MEMIF_ERR_SUCCESS; /* 0 */ + } + + memif_msg_queue_elt_t *cur = c->msg_queue; + while (cur->next != NULL) + { + cur = cur->next; + } + cur->next = e; + + return MEMIF_ERR_SUCCESS; /* 0 */ +} + +/* send information about region specified by region_index */ +static_fn int +memif_msg_enq_add_region (memif_connection_t * c, uint8_t region_index) +{ + /* maybe check if region is valid? */ + memif_region_t *mr = &c->regions[region_index]; + + memif_msg_queue_elt_t *e = + (memif_msg_queue_elt_t *) malloc (sizeof (memif_msg_queue_elt_t)); + if (e == NULL) + return memif_syscall_error_handler (errno); + + memset (&e->msg, 0, sizeof (e->msg)); + memif_msg_add_region_t *ar = &e->msg.add_region; + + e->msg.type = MEMIF_MSG_TYPE_ADD_REGION; + e->fd = mr->fd; + ar->index = region_index; + ar->size = mr->region_size; + + e->next = NULL; + if (c->msg_queue == NULL) + { + c->msg_queue = e; + return MEMIF_ERR_SUCCESS; /* 0 */ + } + + memif_msg_queue_elt_t *cur = c->msg_queue; + while (cur->next != NULL) + { + cur = cur->next; + } + cur->next = e; + + return MEMIF_ERR_SUCCESS; /* 0 */ +} + +/* send information about ring specified by direction (S2M | M2S) and index */ +static_fn int +memif_msg_enq_add_ring (memif_connection_t * c, uint8_t index, uint8_t dir) +{ + memif_msg_queue_elt_t *e = + (memif_msg_queue_elt_t *) malloc (sizeof (memif_msg_queue_elt_t)); + if (e == NULL) + return memif_syscall_error_handler (errno); + + memset (&e->msg, 0, sizeof (e->msg)); + memif_msg_add_ring_t *ar = &e->msg.add_ring; + + e->msg.type = MEMIF_MSG_TYPE_ADD_RING; + + /* TODO: support multiple rings */ + memif_queue_t *mq; + if (dir == MEMIF_RING_M2S) + mq = &c->rx_queues[index]; + else + mq = &c->tx_queues[index]; + + e->fd = mq->int_fd; + ar->index = index; + ar->offset = mq->offset; + ar->region = mq->region; + ar->log2_ring_size = mq->log2_ring_size; + ar->flags = (dir == MEMIF_RING_S2M) ? MEMIF_MSG_ADD_RING_FLAG_S2M : 0; + + e->next = NULL; + if (c->msg_queue == NULL) + { + c->msg_queue = e; + return MEMIF_ERR_SUCCESS; /* 0 */ + } + + memif_msg_queue_elt_t *cur = c->msg_queue; + while (cur->next != NULL) + { + cur = cur->next; + } + cur->next = e; + + return MEMIF_ERR_SUCCESS; /* 0 */ +} + +/* used as connection request from slave */ +static_fn int +memif_msg_enq_connect (memif_connection_t * c) +{ + memif_msg_queue_elt_t *e = + (memif_msg_queue_elt_t *) malloc (sizeof (memif_msg_queue_elt_t)); + if (e == NULL) + return memif_syscall_error_handler (errno); + + memset (&e->msg, 0, sizeof (e->msg)); + memif_msg_connect_t *cm = &e->msg.connect; + + e->msg.type = MEMIF_MSG_TYPE_CONNECT; + e->fd = -1; + strncpy ((char *) cm->if_name, (char *) c->args.interface_name, + strlen ((char *) c->args.interface_name)); + + e->next = NULL; + if (c->msg_queue == NULL) + { + c->msg_queue = e; + return MEMIF_ERR_SUCCESS; /* 0 */ + } + + memif_msg_queue_elt_t *cur = c->msg_queue; + while (cur->next != NULL) + { + cur = cur->next; + } + cur->next = e; + + return MEMIF_ERR_SUCCESS; /* 0 */ +} + +/* used as confirmation of connection by master */ +static_fn int +memif_msg_enq_connected (memif_connection_t * c) +{ + memif_msg_queue_elt_t *e = + (memif_msg_queue_elt_t *) malloc (sizeof (memif_msg_queue_elt_t)); + if (e == NULL) + return memif_syscall_error_handler (errno); + + memset (&e->msg, 0, sizeof (e->msg)); + memif_msg_connected_t *cm = &e->msg.connected; + + e->msg.type = MEMIF_MSG_TYPE_CONNECTED; + e->fd = -1; + strncpy ((char *) cm->if_name, (char *) c->args.interface_name, + strlen ((char *) c->args.interface_name)); + + e->next = NULL; + if (c->msg_queue == NULL) + { + c->msg_queue = e; + return MEMIF_ERR_SUCCESS; /* 0 */ + } + + memif_msg_queue_elt_t *cur = c->msg_queue; + while (cur->next != NULL) + { + cur = cur->next; + } + cur->next = e; + + return MEMIF_ERR_SUCCESS; /* 0 */ +} + +/* immediately send disconnect msg */ + /* specifie protocol for disconnect msg err_code + so that it will be compatible with VPP? (header/doc) */ +int +memif_msg_send_disconnect (int fd, uint8_t * err_string, uint32_t err_code) +{ + memif_msg_t msg = { 0 }; + memif_msg_disconnect_t *d = &msg.disconnect; + + msg.type = MEMIF_MSG_TYPE_DISCONNECT; + d->code = err_code; + uint16_t l = strlen ((char *) err_string); + if (l > 96) + { + DBG ("Disconnect string too long. Sending first 96 characters."); + l = 96; + } + strncpy ((char *) d->string, (char *) err_string, l); + + return memif_msg_send (fd, &msg, -1); +} + +static_fn int +memif_msg_receive_hello (memif_connection_t * c, memif_msg_t * msg) +{ + memif_msg_hello_t *h = &msg->hello; + + if (msg->hello.min_version > MEMIF_VERSION || + msg->hello.max_version < MEMIF_VERSION) + { + DBG ("incompatible protocol version"); + return MEMIF_ERR_PROTO; + } + + c->run_args.num_s2m_rings = memif_min (h->max_s2m_ring + 1, + c->args.num_s2m_rings); + c->run_args.num_m2s_rings = memif_min (h->max_m2s_ring + 1, + c->args.num_m2s_rings); + c->run_args.log2_ring_size = memif_min (h->max_log2_ring_size, + c->args.log2_ring_size); + c->run_args.buffer_size = c->args.buffer_size; + strncpy ((char *) c->remote_name, (char *) h->name, + strlen ((char *) h->name)); + + return MEMIF_ERR_SUCCESS; /* 0 */ +} + +/* handle interface identification (id, secret (optional)) */ +static_fn int +memif_msg_receive_init (memif_socket_t * ms, int fd, memif_msg_t * msg) +{ + memif_msg_init_t *i = &msg->init; + memif_list_elt_t *elt = NULL; + memif_list_elt_t elt2; + memif_connection_t *c = NULL; + libmemif_main_t *lm = &libmemif_main; + uint8_t err_string[96]; + memset (err_string, 0, sizeof (char) * 96); + int err = MEMIF_ERR_SUCCESS; /* 0 */ + int err_disc; + if (i->version != MEMIF_VERSION) + { + DBG ("MEMIF_VER_ERR"); + strncpy ((char *) err_string, MEMIF_VER_ERR, strlen (MEMIF_VER_ERR)); + err = MEMIF_ERR_PROTO; + goto error; + } + + get_list_elt (&elt, ms->interface_list, ms->interface_list_len, i->id); + if (elt == NULL) + { + DBG ("MEMIF_ID_ERR"); + strncpy ((char *) err_string, MEMIF_ID_ERR, strlen (MEMIF_ID_ERR)); + err = MEMIF_ERR_ID; + goto error; + } + + c = (memif_connection_t *) elt->data_struct; + + if (!(c->args.is_master)) + { + DBG ("MEMIF_SLAVE_ERR"); + strncpy ((char *) err_string, MEMIF_SLAVE_ERR, + strlen (MEMIF_SLAVE_ERR)); + err = MEMIF_ERR_ACCSLAVE; + goto error; + } + if (c->fd != -1) + { + DBG ("MEMIF_CONN_ERR"); + strncpy ((char *) err_string, MEMIF_CONN_ERR, strlen (MEMIF_CONN_ERR)); + err = MEMIF_ERR_ALRCONN; + goto error; + } + + c->fd = fd; + + if (i->mode != c->args.mode) + { + DBG ("MEMIF_MODE_ERR"); + strncpy ((char *) err_string, MEMIF_MODE_ERR, strlen (MEMIF_MODE_ERR)); + err = MEMIF_ERR_MODE; + goto error; + } + + strncpy ((char *) c->remote_name, (char *) i->name, + strlen ((char *) i->name)); + + if (c->args.secret) + { + int r; + if (i->secret) + { + if (strlen ((char *) c->args.secret) != strlen ((char *) i->secret)) + { + DBG ("MEMIF_SECRET_ERR"); + strncpy ((char *) err_string, + MEMIF_SECRET_ERR, strlen (MEMIF_SECRET_ERR)); + err = MEMIF_ERR_SECRET; + goto error; + } + r = strncmp ((char *) i->secret, (char *) c->args.secret, + strlen ((char *) c->args.secret)); + if (r != 0) + { + DBG ("MEMIF_SECRET_ERR"); + strncpy ((char *) err_string, + MEMIF_SECRET_ERR, strlen (MEMIF_SECRET_ERR)); + err = MEMIF_ERR_SECRET; + goto error; + } + } + else + { + DBG ("MEMIF_NOSECRET_ERR"); + strncpy ((char *) err_string, + MEMIF_NOSECRET_ERR, strlen (MEMIF_NOSECRET_ERR)); + err = MEMIF_ERR_NOSECRET; + goto error; + } + } + + c->read_fn = memif_conn_fd_read_ready; + c->write_fn = memif_conn_fd_write_ready; + c->error_fn = memif_conn_fd_error; + + elt2.key = c->fd; + elt2.data_struct = c; + + add_list_elt (&elt2, &lm->control_list, &lm->control_list_len); + free_list_elt (lm->pending_list, lm->pending_list_len, fd); + + return err; + +error: + memif_msg_send_disconnect (fd, err_string, 0); + lm->control_fd_update (fd, MEMIF_FD_EVENT_DEL); + free_list_elt (lm->pending_list, lm->pending_list_len, fd); + close (fd); + fd = -1; + return err; +} + +/* receive region information and add new region to connection (if possible) */ +static_fn int +memif_msg_receive_add_region (memif_connection_t * c, memif_msg_t * msg, + int fd) +{ + memif_msg_add_region_t *ar = &msg->add_region; + memif_region_t *mr; + if (fd < 0) + return MEMIF_ERR_NO_SHMFD; + + if (ar->index > MEMIF_MAX_REGION) + return MEMIF_ERR_MAXREG; + + mr = + (memif_region_t *) realloc (c->regions, + sizeof (memif_region_t) * (ar->index + 1)); + if (mr == NULL) + return memif_syscall_error_handler (errno); + c->regions = mr; + c->regions[ar->index].fd = fd; + c->regions[ar->index].region_size = ar->size; + c->regions[ar->index].shm = NULL; + + return MEMIF_ERR_SUCCESS; /* 0 */ +} + +/* receive ring information and add new ring to connection queue + (based on direction S2M | M2S) */ +static_fn int +memif_msg_receive_add_ring (memif_connection_t * c, memif_msg_t * msg, int fd) +{ + memif_msg_add_ring_t *ar = &msg->add_ring; + + memif_queue_t *mq; + + if (fd < 0) + return MEMIF_ERR_NO_INTFD; + + if (ar->flags & MEMIF_MSG_ADD_RING_FLAG_S2M) + { + if (ar->index > MEMIF_MAX_S2M_RING) + return MEMIF_ERR_MAXRING; + if (ar->index >= c->args.num_s2m_rings) + return MEMIF_ERR_MAXRING; + + mq = + (memif_queue_t *) realloc (c->rx_queues, + sizeof (memif_queue_t) * (ar->index + 1)); + if (mq == NULL) + return memif_syscall_error_handler (errno); + c->rx_queues = mq; + c->rx_queues[ar->index].int_fd = fd; + c->rx_queues[ar->index].log2_ring_size = ar->log2_ring_size; + c->rx_queues[ar->index].region = ar->region; + c->rx_queues[ar->index].offset = ar->offset; + c->run_args.num_s2m_rings++; + } + else + { + if (ar->index > MEMIF_MAX_M2S_RING) + return MEMIF_ERR_MAXRING; + if (ar->index >= c->args.num_m2s_rings) + return MEMIF_ERR_MAXRING; + + mq = + (memif_queue_t *) realloc (c->tx_queues, + sizeof (memif_queue_t) * (ar->index + 1)); + if (mq == NULL) + return memif_syscall_error_handler (errno); + c->tx_queues = mq; + c->tx_queues[ar->index].int_fd = fd; + c->tx_queues[ar->index].log2_ring_size = ar->log2_ring_size; + c->tx_queues[ar->index].region = ar->region; + c->tx_queues[ar->index].offset = ar->offset; + c->run_args.num_m2s_rings++; + } + + return MEMIF_ERR_SUCCESS; /* 0 */ +} + +/* slave -> master */ +static_fn int +memif_msg_receive_connect (memif_connection_t * c, memif_msg_t * msg) +{ + memif_msg_connect_t *cm = &msg->connect; + libmemif_main_t *lm = &libmemif_main; + memif_list_elt_t elt; + + int err; + err = memif_connect1 (c); + if (err != MEMIF_ERR_SUCCESS) + return err; + + strncpy ((char *) c->remote_if_name, (char *) cm->if_name, + strlen ((char *) cm->if_name)); + + int i; + if (c->on_interrupt != NULL) + { + for (i = 0; i < c->run_args.num_m2s_rings; i++) + { + elt.key = c->rx_queues[i].int_fd; + elt.data_struct = c; + add_list_elt (&elt, &lm->interrupt_list, &lm->interrupt_list_len); + + lm->control_fd_update (c->rx_queues[i].int_fd, MEMIF_FD_EVENT_READ); + } + + } + + c->on_connect ((void *) c, c->private_ctx); + + return err; +} + +/* master -> slave */ +static_fn int +memif_msg_receive_connected (memif_connection_t * c, memif_msg_t * msg) +{ + memif_msg_connect_t *cm = &msg->connect; + libmemif_main_t *lm = &libmemif_main; + + int err; + err = memif_connect1 (c); + if (err != MEMIF_ERR_SUCCESS) + return err; + + strncpy ((char *) c->remote_if_name, (char *) cm->if_name, + strlen ((char *) cm->if_name)); + + int i; + if (c->on_interrupt != NULL) + { + for (i = 0; i < c->run_args.num_s2m_rings; i++) + lm->control_fd_update (c->rx_queues[i].int_fd, MEMIF_FD_EVENT_READ); + } + + c->on_connect ((void *) c, c->private_ctx); + + return err; +} + +static_fn int +memif_msg_receive_disconnect (memif_connection_t * c, memif_msg_t * msg) +{ + memif_msg_disconnect_t *d = &msg->disconnect; + + memset (c->remote_disconnect_string, 0, + sizeof (c->remote_disconnect_string)); + strncpy ((char *) c->remote_disconnect_string, (char *) d->string, + strlen ((char *) d->string)); + + /* on returning error, handle function will call memif_disconnect () */ + DBG ("disconnect received: %s, mode: %d", + c->remote_disconnect_string, c->args.mode); + return MEMIF_ERR_DISCONNECT; +} + +static_fn int +memif_msg_receive (int ifd) +{ + char ctl[CMSG_SPACE (sizeof (int)) + + CMSG_SPACE (sizeof (struct ucred))] = { 0 }; + struct msghdr mh = { 0 }; + struct iovec iov[1]; + memif_msg_t msg = { 0 }; + ssize_t size; + int err = MEMIF_ERR_SUCCESS; /* 0 */ + int fd = -1; + int i; + libmemif_main_t *lm = &libmemif_main; + memif_connection_t *c = NULL; + memif_socket_t *ms = NULL; + memif_list_elt_t *elt = NULL; + + iov[0].iov_base = (void *) &msg; + iov[0].iov_len = sizeof (memif_msg_t); + mh.msg_iov = iov; + mh.msg_iovlen = 1; + mh.msg_control = ctl; + mh.msg_controllen = sizeof (ctl); + + DBG ("recvmsg fd %d", ifd); + size = recvmsg (ifd, &mh, 0); + DBG ("done"); + if (size != sizeof (memif_msg_t)) + { + if (size == 0) + return MEMIF_ERR_DISCONNECTED; + else + return MEMIF_ERR_MFMSG; + } + + struct ucred *cr = 0; + struct cmsghdr *cmsg; + + cmsg = CMSG_FIRSTHDR (&mh); + while (cmsg) + { + if (cmsg->cmsg_level == SOL_SOCKET) + { + if (cmsg->cmsg_type == SCM_CREDENTIALS) + { + cr = (struct ucred *) CMSG_DATA (cmsg); + } + else if (cmsg->cmsg_type == SCM_RIGHTS) + { + int *fdp = (int *) CMSG_DATA (cmsg); + fd = *fdp; + } + } + cmsg = CMSG_NXTHDR (&mh, cmsg); + } + + DBG ("Message type %u received", msg.type); + + get_list_elt (&elt, lm->control_list, lm->control_list_len, ifd); + if (elt != NULL) + c = (memif_connection_t *) elt->data_struct; + + switch (msg.type) + { + case MEMIF_MSG_TYPE_ACK: + break; + + case MEMIF_MSG_TYPE_HELLO: + if ((err = memif_msg_receive_hello (c, &msg)) != MEMIF_ERR_SUCCESS) + return err; + if ((err = memif_init_regions_and_queues (c)) != MEMIF_ERR_SUCCESS) + return err; + if ((err = memif_msg_enq_init (c)) != MEMIF_ERR_SUCCESS) + return err; + if ((err = memif_msg_enq_add_region (c, 0)) != MEMIF_ERR_SUCCESS) + return err; + for (i = 0; i < c->run_args.num_s2m_rings; i++) + { + if ((err = + memif_msg_enq_add_ring (c, i, + MEMIF_RING_S2M)) != MEMIF_ERR_SUCCESS) + return err; + } + for (i = 0; i < c->run_args.num_m2s_rings; i++) + { + if ((err = + memif_msg_enq_add_ring (c, i, + MEMIF_RING_M2S)) != MEMIF_ERR_SUCCESS) + return err; + } + if ((err = memif_msg_enq_connect (c)) != MEMIF_ERR_SUCCESS) + return err; + break; + + case MEMIF_MSG_TYPE_INIT: + get_list_elt (&elt, lm->pending_list, lm->pending_list_len, ifd); + if (elt == NULL) + return -1; + ms = (memif_socket_t *) elt->data_struct; + if ((err = memif_msg_receive_init (ms, ifd, &msg)) != MEMIF_ERR_SUCCESS) + return err; + /* c->remote_pid = cr->pid */ + /* c->remote_uid = cr->uid */ + /* c->remote_gid = cr->gid */ + get_list_elt (&elt, lm->control_list, lm->control_list_len, ifd); + if (elt == NULL) + return -1; + c = (memif_connection_t *) elt->data_struct; + if ((err = memif_msg_enq_ack (c)) != MEMIF_ERR_SUCCESS) + return err; + break; + + case MEMIF_MSG_TYPE_ADD_REGION: + if ((err = + memif_msg_receive_add_region (c, &msg, fd)) != MEMIF_ERR_SUCCESS) + return err; + if ((err = memif_msg_enq_ack (c)) != MEMIF_ERR_SUCCESS) + return err; + break; + + case MEMIF_MSG_TYPE_ADD_RING: + if ((err = + memif_msg_receive_add_ring (c, &msg, fd)) != MEMIF_ERR_SUCCESS) + return err; + if ((err = memif_msg_enq_ack (c)) != MEMIF_ERR_SUCCESS) + return err; + break; + + case MEMIF_MSG_TYPE_CONNECT: + if ((err = memif_msg_receive_connect (c, &msg)) != MEMIF_ERR_SUCCESS) + return err; + if ((err = memif_msg_enq_connected (c)) != MEMIF_ERR_SUCCESS) + return err; + break; + + case MEMIF_MSG_TYPE_CONNECTED: + if ((err = memif_msg_receive_connected (c, &msg)) != MEMIF_ERR_SUCCESS) + return err; + break; + + case MEMIF_MSG_TYPE_DISCONNECT: + if ((err = memif_msg_receive_disconnect (c, &msg)) != MEMIF_ERR_SUCCESS) + return err; + break; + + default: + return MEMIF_ERR_UNKNOWN_MSG;; + break; + } + + if (c != NULL) + c->flags |= MEMIF_CONNECTION_FLAG_WRITE; +/* libmemif_main_t *lm = &libmemif_main; + lm->control_fd_update (c->fd, MEMIF_FD_EVENT_READ | MEMIF_FD_EVENT_MOD); */ + return MEMIF_ERR_SUCCESS; /* 0 */ +} + +int +memif_conn_fd_error (memif_connection_t * c) +{ + DBG ("connection fd error"); + strncpy ((char *) c->remote_disconnect_string, "connection fd error", 19); + int err = memif_disconnect_internal (c); + return err; +} + +/* calls memif_msg_receive to handle pending messages on socket */ +int +memif_conn_fd_read_ready (memif_connection_t * c) +{ + int err; + err = memif_msg_receive (c->fd); + if (err != 0) + { + err = memif_disconnect_internal (c); + } + return err; +} + +/* get msg from msg queue buffer and send it to socket */ +int +memif_conn_fd_write_ready (memif_connection_t * c) +{ + int err = MEMIF_ERR_SUCCESS; /* 0 */ + + + if ((c->flags & MEMIF_CONNECTION_FLAG_WRITE) == 0) + goto done; + + memif_msg_queue_elt_t *e = c->msg_queue; + if (e == NULL) + goto done; + + c->msg_queue = c->msg_queue->next; + + c->flags &= ~MEMIF_CONNECTION_FLAG_WRITE; +/* + libmemif_main_t *lm = &libmemif_main; + + lm->control_fd_update (c->fd, + MEMIF_FD_EVENT_READ | MEMIF_FD_EVENT_WRITE | MEMIF_FD_EVENT_MOD); +*/ + err = memif_msg_send (c->fd, &e->msg, e->fd); + free (e); + goto done; + +done: + return err; +} + +int +memif_conn_fd_accept_ready (memif_socket_t * ms) +{ + int addr_len; + struct sockaddr_un client; + int conn_fd; + libmemif_main_t *lm = &libmemif_main; + + DBG ("accept called"); + + addr_len = sizeof (client); + conn_fd = + accept (ms->fd, (struct sockaddr *) &client, (socklen_t *) & addr_len); + + if (conn_fd < 0) + { + return memif_syscall_error_handler (errno); + } + DBG ("accept fd %d", ms->fd); + DBG ("conn fd %d", conn_fd); + + memif_list_elt_t elt; + elt.key = conn_fd; + elt.data_struct = ms; + + add_list_elt (&elt, &lm->pending_list, &lm->pending_list_len); + lm->control_fd_update (conn_fd, MEMIF_FD_EVENT_READ | MEMIF_FD_EVENT_WRITE); + + return memif_msg_send_hello (conn_fd); +} + +int +memif_read_ready (int fd) +{ + int err; + DBG ("call recv"); + err = memif_msg_receive (fd); + DBG ("recv finished"); + return err; +} |