/* Unix SMB/CIFS implementation. Packet handling Copyright (C) Volker Lendecke 2007 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 "includes.h" struct packet_context { int fd; struct data_blob in, out; }; /* * Close the underlying fd */ static int packet_context_destructor(struct packet_context *ctx) { return close(ctx->fd); } /* * Initialize a packet context. The fd is given to the packet context, meaning * that it is automatically closed when the packet context is freed. */ struct packet_context *packet_init(TALLOC_CTX *mem_ctx, int fd) { struct packet_context *result; if (!(result = TALLOC_ZERO_P(mem_ctx, struct packet_context))) { return NULL; } result->fd = fd; talloc_set_destructor(result, packet_context_destructor); return result; } /* * Pull data from the fd */ NTSTATUS packet_fd_read(struct packet_context *ctx) { int res, available; size_t new_size; uint8 *in; res = ioctl(ctx->fd, FIONREAD, &available); if (res == -1) { DEBUG(10, ("ioctl(FIONREAD) failed: %s\n", strerror(errno))); return map_nt_error_from_unix(errno); } SMB_ASSERT(available >= 0); if (available == 0) { return NT_STATUS_END_OF_FILE; } new_size = ctx->in.length + available; if (new_size < ctx->in.length) { DEBUG(0, ("integer wrap\n")); return NT_STATUS_NO_MEMORY; } if (!(in = TALLOC_REALLOC_ARRAY(ctx, ctx->in.data, uint8, new_size))) { DEBUG(10, ("talloc failed\n")); return NT_STATUS_NO_MEMORY; } ctx->in.data = in; res = recv(ctx->fd, in + ctx->in.length, available, 0); if (res < 0) { DEBUG(10, ("recv failed: %s\n", strerror(errno))); return map_nt_error_from_unix(errno); } if (res == 0) { return NT_STATUS_END_OF_FILE; } ctx->in.length += res; return NT_STATUS_OK; } NTSTATUS packet_fd_read_sync(struct packet_context *ctx) { int res; fd_set r_fds; FD_ZERO(&r_fds); FD_SET(ctx->fd, &r_fds); res = sys_select(ctx->fd+1, &r_fds, NULL, NULL, NULL); if (res == -1) { DEBUG(10, ("select returned %s\n", strerror(errno))); return map_nt_error_from_unix(errno); } return packet_fd_read(ctx); } bool packet_handler(struct packet_context *ctx, bool (*full_req)(const struct data_blob *data, size_t *length, void *private_data), NTSTATUS (*callback)(const struct data_blob *data, void *private_data), void *private_data, NTSTATUS *status) { size_t length; struct data_blob data; if (!full_req(&ctx->in, &length, private_data)) { return False; } SMB_ASSERT(length <= ctx->in.length); data = data_blob(ctx->in.data, length); memmove(ctx->in.data, ctx->in.data + length, ctx->in.length - length); ctx->in.length -= length; *status = callback(&data, private_data); data_blob_free(&data); return True; } /* * How many bytes of outgoing data do we have pending? */ size_t packet_outgoing_bytes(struct packet_context *ctx) { return ctx->out.length; } /* * Push data to the fd */ NTSTATUS packet_fd_write(struct packet_context *ctx) { ssize_t sent; sent = send(ctx->fd, ctx->out.data, ctx->out.length, 0); if (sent == -1) { DEBUG(0, ("send failed: %s\n", strerror(errno))); return map_nt_error_from_unix(errno); } memmove(ctx->out.data, ctx->out.data + sent, ctx->out.length - sent); ctx->out.length -= sent; return NT_STATUS_OK; } /* * Sync flush all outgoing bytes */ NTSTATUS packet_flush(struct packet_context *ctx) { while (ctx->out.length != 0) { NTSTATUS status = packet_fd_write(ctx); if (!NT_STATUS_IS_OK(status)) { return status; } } return NT_STATUS_OK; } /* * Send a list of DATA_BLOBs * * Example: packet_send(ctx, 2, data_blob_const(&size, sizeof(size)), * data_blob_const(buf, size)); */ NTSTATUS packet_send(struct packet_context *ctx, int num_blobs, ...) { va_list ap; int i; size_t len; uint8 *out; len = ctx->out.length; va_start(ap, num_blobs); for (i=0; i<num_blobs; i++) { size_t tmp; struct data_blob blob = va_arg(ap, struct data_blob); tmp = len + blob.length; if (tmp < len) { DEBUG(0, ("integer overflow\n")); va_end(ap); return NT_STATUS_NO_MEMORY; } len = tmp; } va_end(ap); if (len == 0) { return NT_STATUS_OK; } if (!(out = TALLOC_REALLOC_ARRAY(ctx, ctx->out.data, uint8, len))) { DEBUG(0, ("talloc failed\n")); return NT_STATUS_NO_MEMORY; } ctx->out.data = out; va_start(ap, num_blobs); for (i=0; i<num_blobs; i++) { struct data_blob blob = va_arg(ap, struct data_blob); memcpy(ctx->out.data+ctx->out.length, blob.data, blob.length); ctx->out.length += blob.length; } va_end(ap); SMB_ASSERT(ctx->out.length == len); return NT_STATUS_OK; } /* * Get the packet context's file descriptor */ int packet_get_fd(struct packet_context *ctx) { return ctx->fd; }