--- /dev/null
+/*
+ Copyright (C) 2010 by Ronnie Sahlberg <ronniesahlberg@gmail.com>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <netinet/in.h>
+#include <poll.h>
+#include <sys/ioctl.h>
+#include <arpa/inet.h>
+#include "iscsi.h"
+#include "iscsi-private.h"
+#include "dlinklist.h"
+
+static void set_nonblocking(int fd)
+{
+ unsigned v;
+ v = fcntl(fd, F_GETFL, 0);
+ fcntl(fd, F_SETFL, v | O_NONBLOCK);
+}
+
+int iscsi_connect_async(struct iscsi_context *iscsi, const char *target, iscsi_command_cb cb, void *private_data)
+{
+ int tpgt = -1;
+ int port = 3260;
+ char *str;
+ char *addr;
+ struct sockaddr_storage s;
+ struct sockaddr_in *sin = (struct sockaddr_in *)&s;
+ int socksize;
+
+ if (iscsi == NULL) {
+ printf("Trying to connect NULL context\n");
+ return -1;
+ }
+ if (iscsi->fd != -1) {
+ printf("Trying to connect but already connected\n");
+ return -2;
+ }
+
+ addr = strdup(target);
+ if (addr == NULL) {
+ printf("failed to strdup target address\n");
+ return -3;
+ }
+
+ /* check if we have a target portal group tag */
+ if ((str = rindex(addr, ',')) != NULL) {
+ tpgt = atoi(str+1);
+ str[0] = 0;
+ }
+
+ /* XXX need handling for {ipv6 addresses} */
+ /* for now, assume all is ipv4 */
+ if ((str = rindex(addr, ':')) != NULL) {
+ port = atoi(str+1);
+ str[0] = 0;
+ }
+
+ sin->sin_family = AF_INET;
+ sin->sin_port = htons(port);
+ if (inet_pton(AF_INET, addr, &sin->sin_addr) != 1) {
+ printf("failed to convert to ip address\n");
+ free(addr);
+ return -4;
+ }
+ free(addr);
+
+ switch (s.ss_family) {
+ case AF_INET:
+ iscsi->fd = socket(AF_INET, SOCK_STREAM, 0);
+ socksize = sizeof(struct sockaddr_in);
+ break;
+ default:
+ printf("Unknown family :%d\n", s.ss_family);
+ return -5;
+
+ }
+
+ if (iscsi->fd == -1) {
+ printf("Failed to open socket\n");
+ return -6;
+
+ }
+
+ iscsi->connect_cb = cb;
+ iscsi->connect_data = private_data;
+
+ set_nonblocking(iscsi->fd);
+
+ if (connect(iscsi->fd, (struct sockaddr *)&s, socksize) != 0 && errno != EINPROGRESS) {
+ printf("Connect failed errno : %s (%d)\n", strerror(errno), errno);
+ return -7;
+ }
+
+ return 0;
+}
+
+int iscsi_disconnect(struct iscsi_context *iscsi)
+{
+ if (iscsi == NULL) {
+ printf("Trying to disconnect NULL context\n");
+ return -1;
+ }
+ if (iscsi->is_loggedin != 0) {
+ printf("Trying to disconnect while logged in\n");
+ return -2;
+ }
+ if (iscsi->fd == -1) {
+ printf("Trying to disconnect but not connected\n");
+ return -3;
+ }
+
+ close(iscsi->fd);
+ iscsi->fd = -1;
+
+ iscsi->is_connected = 0;
+
+ return 0;
+}
+
+int iscsi_get_fd(struct iscsi_context *iscsi)
+{
+ if (iscsi == NULL) {
+ printf("Trying to get fd for NULL context\n");
+ return -1;
+ }
+
+ return iscsi->fd;
+}
+
+int iscsi_which_events(struct iscsi_context *iscsi)
+{
+ int events = POLLIN;
+
+ if (iscsi->is_connected == 0) {
+ events |= POLLOUT;
+ }
+
+ if (iscsi->outqueue) {
+ events |= POLLOUT;
+ }
+ return events;
+}
+
+static int iscsi_read_from_socket(struct iscsi_context *iscsi)
+{
+ int available;
+ int size;
+ unsigned char *buf;
+ ssize_t count;
+
+ if (ioctl(iscsi->fd, FIONREAD, &available) != 0) {
+ printf("ioctl FIONREAD returned error : %d\n", errno);
+ return -1;
+ }
+ if (available == 0) {
+ printf("no data readable in socket, socket is closed\n");
+ return -2;
+ }
+ size = iscsi->insize - iscsi->inpos + available;
+ buf = malloc(size);
+ if (buf == NULL) {
+ printf("failed to allocate %d bytes for input buffer\n", size);
+ return -3;
+ }
+ if (iscsi->insize > iscsi->inpos) {
+ memcpy(buf, iscsi->inbuf + iscsi->inpos, iscsi->insize - iscsi->inpos);
+ iscsi->insize -= iscsi->inpos;
+ iscsi->inpos = 0;
+ }
+
+ count = read(iscsi->fd, buf + iscsi->insize, available);
+ if (count == -1) {
+ if (errno == EINTR) {
+ free(buf);
+ buf = NULL;
+ return 0;
+ }
+ printf("read from socket failed, errno:%d\n", errno);
+ free(buf);
+ buf = NULL;
+ return -4;
+ }
+
+ if (iscsi->inbuf != NULL) {
+ free(iscsi->inbuf);
+ }
+ iscsi->inbuf = buf;
+ iscsi->insize += count;
+
+ while (1) {
+ if (iscsi->insize - iscsi->inpos < 48) {
+ return 0;
+ }
+ count = iscsi_get_pdu_size(iscsi->inbuf + iscsi->inpos);
+ if (iscsi->insize + iscsi->inpos < count) {
+ return 0;
+ }
+ if (iscsi_process_pdu(iscsi, iscsi->inbuf + iscsi->inpos, count) != 0) {
+ printf("failed to process pdu\n");
+ return -5;
+ }
+ iscsi->inpos += count;
+ if (iscsi->inpos == iscsi->insize) {
+ free(iscsi->inbuf);
+ iscsi->inbuf = NULL;
+ iscsi->insize = 0;
+ iscsi->inpos = 0;
+ }
+ if (iscsi->inpos > iscsi->insize) {
+ printf("inpos > insize. bug!\n");
+ return -6;
+ }
+ }
+
+ return 0;
+}
+
+static int iscsi_write_to_socket(struct iscsi_context *iscsi)
+{
+ ssize_t count;
+
+ if (iscsi == NULL) {
+ printf("trying to write to socket for NULL context\n");
+ return -1;
+ }
+ if (iscsi->fd == -1) {
+ printf("trying to write but not connected\n");
+ return -2;
+ }
+
+ while (iscsi->outqueue != NULL) {
+ ssize_t total;
+
+ total = iscsi->outqueue->outdata.size;
+ total = (total +3) & 0xfffffffc;
+
+ count = write(iscsi->fd, iscsi->outqueue->outdata.data + iscsi->outqueue->written, total - iscsi->outqueue->written);
+ if (count == -1) {
+ if (errno == EAGAIN || errno == EWOULDBLOCK) {
+ printf("socket would block, return from write to socket\n");
+ return 0;
+ }
+ printf("Error when writing to socket :%d\n", errno);
+ return -3;
+ }
+
+ iscsi->outqueue->written += count;
+ if (iscsi->outqueue->written == total) {
+ struct iscsi_pdu *pdu = iscsi->outqueue;
+
+ DLIST_REMOVE(iscsi->outqueue, pdu);
+ DLIST_ADD_END(iscsi->waitpdu, pdu, NULL);
+ }
+ }
+ return 0;
+}
+
+int iscsi_service(struct iscsi_context *iscsi, int revents)
+{
+ if (revents & POLLERR) {
+ printf("iscsi_service: POLLERR, socket error\n");
+ iscsi->connect_cb(iscsi, ISCSI_STATUS_ERROR, NULL, iscsi->connect_data);
+ return -1;
+ }
+ if (revents & POLLHUP) {
+ printf("iscsi_service: POLLHUP, socket error\n");
+ iscsi->connect_cb(iscsi, ISCSI_STATUS_ERROR, NULL, iscsi->connect_data);
+ return -2;
+ }
+
+ if (iscsi->is_connected == 0 && iscsi->fd != -1 && revents&POLLOUT) {
+ iscsi->is_connected = 1;
+ iscsi->connect_cb(iscsi, ISCSI_STATUS_GOOD, NULL, iscsi->connect_data);
+ return 0;
+ }
+
+ if (revents & POLLOUT && iscsi->outqueue != NULL) {
+ if (iscsi_write_to_socket(iscsi) != 0) {
+ printf("write to socket failed\n");
+ return -3;
+ }
+ }
+ if (revents & POLLIN) {
+ if (iscsi_read_from_socket(iscsi) != 0) {
+ printf("read from socket failed\n");
+ return -4;
+ }
+ }
+
+ return 0;
+}
+
+int iscsi_queue_pdu(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
+{
+ if (iscsi == NULL) {
+ printf("trying to queue to NULL context\n");
+ return -1;
+ }
+ if (pdu == NULL) {
+ printf("trying to queue NULL pdu\n");
+ return -2;
+ }
+ DLIST_ADD_END(iscsi->outqueue, pdu, NULL);
+
+ return 0;
+}
+
+
+
projects / ccan / blobdiff