| 1 | /*
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| 2 | Unix SMB/CIFS implementation.
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| 3 | Utilities around tsocket
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| 4 | Copyright (C) Volker Lendecke 2009
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| 5 |
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| 6 | This program is free software; you can redistribute it and/or modify
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| 7 | it under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation; either version 3 of the License, or
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| 9 | (at your option) any later version.
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| 10 |
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| 11 | This program is distributed in the hope that it will be useful,
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | GNU General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 18 | */
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| 19 |
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| 20 | #include "includes.h"
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| 21 |
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| 22 | struct tstream_read_packet_state {
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| 23 | struct tevent_context *ev;
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| 24 | struct tstream_context *stream;
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| 25 | ssize_t (*more)(uint8_t *buf, size_t buflen, void *private_data);
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| 26 | void *private_data;
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| 27 | uint8_t *buf;
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| 28 | struct iovec iov;
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| 29 | };
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| 30 |
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| 31 | static void tstream_read_packet_done(struct tevent_req *subreq);
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| 32 |
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| 33 | struct tevent_req *tstream_read_packet_send(TALLOC_CTX *mem_ctx,
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| 34 | struct tevent_context *ev,
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| 35 | struct tstream_context *stream,
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| 36 | size_t initial,
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| 37 | ssize_t (*more)(uint8_t *buf,
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| 38 | size_t buflen,
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| 39 | void *private_data),
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| 40 | void *private_data)
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| 41 | {
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| 42 | struct tevent_req *req, *subreq;
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| 43 | struct tstream_read_packet_state *state;
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| 44 |
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| 45 | req = tevent_req_create(mem_ctx, &state,
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| 46 | struct tstream_read_packet_state);
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| 47 | if (req == NULL) {
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| 48 | return NULL;
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| 49 | }
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| 50 | state->buf = talloc_array(state, uint8_t, initial);
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| 51 | if (tevent_req_nomem(state->buf, req)) {
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| 52 | return tevent_req_post(req, ev);
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| 53 | }
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| 54 | state->iov.iov_base = state->buf;
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| 55 | state->iov.iov_len = initial;
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| 56 |
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| 57 | state->ev = ev;
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| 58 | state->stream = stream;
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| 59 | state->more = more;
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| 60 | state->private_data = private_data;
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| 61 |
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| 62 | subreq = tstream_readv_send(state, ev, stream, &state->iov, 1);
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| 63 | if (tevent_req_nomem(subreq, req)) {
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| 64 | return tevent_req_post(req, ev);
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| 65 | }
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| 66 | tevent_req_set_callback(subreq, tstream_read_packet_done, req);
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| 67 |
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| 68 | return req;
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| 69 | }
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| 70 |
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| 71 | static void tstream_read_packet_done(struct tevent_req *subreq)
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| 72 | {
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| 73 | struct tevent_req *req = tevent_req_callback_data(
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| 74 | subreq, struct tevent_req);
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| 75 | struct tstream_read_packet_state *state = tevent_req_data(
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| 76 | req, struct tstream_read_packet_state);
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| 77 | int ret, err;
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| 78 | size_t total;
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| 79 | ssize_t more;
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| 80 | uint8_t *tmp;
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| 81 |
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| 82 | ret = tstream_readv_recv(subreq, &err);
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| 83 | TALLOC_FREE(subreq);
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| 84 | if (ret == 0) {
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| 85 | err = EPIPE;
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| 86 | }
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| 87 | if (ret <= 0) {
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| 88 | tevent_req_error(req, err);
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| 89 | return;
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| 90 | }
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| 91 |
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| 92 | if (state->more == NULL) {
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| 93 | /* Nobody to ask, this is a async read_data */
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| 94 | tevent_req_done(req);
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| 95 | return;
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| 96 | }
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| 97 | total = talloc_array_length(state->buf);
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| 98 |
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| 99 | more = state->more(state->buf, total, state->private_data);
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| 100 | if (more == -1) {
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| 101 | /* We got an invalid packet, tell the caller */
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| 102 | tevent_req_error(req, EIO);
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| 103 | return;
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| 104 | }
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| 105 | if (more == 0) {
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| 106 | /* We're done, full packet received */
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| 107 | tevent_req_done(req);
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| 108 | return;
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| 109 | }
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| 110 |
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| 111 | tmp = talloc_realloc(state, state->buf, uint8_t, total+more);
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| 112 | if (tevent_req_nomem(tmp, req)) {
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| 113 | return;
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| 114 | }
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| 115 | state->buf = tmp;
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| 116 |
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| 117 | state->iov.iov_base = state->buf + total;
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| 118 | state->iov.iov_len = more;
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| 119 |
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| 120 | subreq = tstream_readv_send(state, state->ev, state->stream,
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| 121 | &state->iov, 1);
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| 122 | if (tevent_req_nomem(subreq, req)) {
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| 123 | return;
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| 124 | }
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| 125 | tevent_req_set_callback(subreq, tstream_read_packet_done, req);
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| 126 | }
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| 127 |
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| 128 | ssize_t tstream_read_packet_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
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| 129 | uint8_t **pbuf, int *perrno)
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| 130 | {
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| 131 | struct tstream_read_packet_state *state =
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| 132 | tevent_req_data(req, struct tstream_read_packet_state);
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| 133 |
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| 134 | if (tevent_req_is_unix_error(req, perrno)) {
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| 135 | return -1;
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| 136 | }
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| 137 | *pbuf = talloc_move(mem_ctx, &state->buf);
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| 138 | return talloc_array_length(*pbuf);
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| 139 | }
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