1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2009-2010 The FreeBSD Foundation 5 * Copyright (c) 2011 Pawel Jakub Dawidek <pawel@dawidek.net> 6 * All rights reserved. 7 * 8 * This software was developed by Pawel Jakub Dawidek under sponsorship from 9 * the FreeBSD Foundation. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <sys/endian.h> 37 38 #include <errno.h> 39 #include <strings.h> 40 41 #include <hast.h> 42 #include <ebuf.h> 43 #include <nv.h> 44 #include <pjdlog.h> 45 #include <proto.h> 46 47 #include "hast_checksum.h" 48 #include "hast_compression.h" 49 #include "hast_proto.h" 50 51 struct hast_main_header { 52 /* Protocol version. */ 53 uint8_t version; 54 /* Size of nv headers. */ 55 uint32_t size; 56 } __packed; 57 58 typedef int hps_send_t(const struct hast_resource *, struct nv *nv, void **, 59 size_t *, bool *); 60 typedef int hps_recv_t(const struct hast_resource *, struct nv *nv, void **, 61 size_t *, bool *); 62 63 struct hast_pipe_stage { 64 const char *hps_name; 65 hps_send_t *hps_send; 66 hps_recv_t *hps_recv; 67 }; 68 69 static struct hast_pipe_stage pipeline[] = { 70 { "compression", compression_send, compression_recv }, 71 { "checksum", checksum_send, checksum_recv } 72 }; 73 74 /* 75 * Send the given nv structure via conn. 76 * We keep headers in nv structure and pass data in separate argument. 77 * There can be no data at all (data is NULL then). 78 */ 79 int 80 hast_proto_send(const struct hast_resource *res, struct proto_conn *conn, 81 struct nv *nv, const void *data, size_t size) 82 { 83 struct hast_main_header hdr; 84 struct ebuf *eb; 85 bool freedata; 86 void *dptr, *hptr; 87 size_t hsize; 88 int ret; 89 90 dptr = (void *)(uintptr_t)data; 91 freedata = false; 92 ret = -1; 93 94 if (data != NULL) { 95 unsigned int ii; 96 97 for (ii = 0; ii < sizeof(pipeline) / sizeof(pipeline[0]); 98 ii++) { 99 (void)pipeline[ii].hps_send(res, nv, &dptr, &size, 100 &freedata); 101 } 102 nv_add_uint32(nv, size, "size"); 103 if (nv_error(nv) != 0) { 104 errno = nv_error(nv); 105 goto end; 106 } 107 } 108 109 eb = nv_hton(nv); 110 if (eb == NULL) 111 goto end; 112 113 hdr.version = res != NULL ? res->hr_version : HAST_PROTO_VERSION; 114 hdr.size = htole32((uint32_t)ebuf_size(eb)); 115 if (ebuf_add_head(eb, &hdr, sizeof(hdr)) == -1) 116 goto end; 117 118 hptr = ebuf_data(eb, &hsize); 119 if (proto_send(conn, hptr, hsize) == -1) 120 goto end; 121 if (data != NULL && proto_send(conn, dptr, size) == -1) 122 goto end; 123 124 ret = 0; 125 end: 126 if (freedata) 127 free(dptr); 128 return (ret); 129 } 130 131 int 132 hast_proto_recv_hdr(const struct proto_conn *conn, struct nv **nvp) 133 { 134 struct hast_main_header hdr; 135 struct nv *nv; 136 struct ebuf *eb; 137 void *hptr; 138 139 eb = NULL; 140 nv = NULL; 141 142 if (proto_recv(conn, &hdr, sizeof(hdr)) == -1) 143 goto fail; 144 145 if (hdr.version > HAST_PROTO_VERSION) { 146 errno = ERPCMISMATCH; 147 goto fail; 148 } 149 150 hdr.size = le32toh(hdr.size); 151 152 eb = ebuf_alloc(hdr.size); 153 if (eb == NULL) 154 goto fail; 155 if (ebuf_add_tail(eb, NULL, hdr.size) == -1) 156 goto fail; 157 hptr = ebuf_data(eb, NULL); 158 PJDLOG_ASSERT(hptr != NULL); 159 if (proto_recv(conn, hptr, hdr.size) == -1) 160 goto fail; 161 nv = nv_ntoh(eb); 162 if (nv == NULL) 163 goto fail; 164 165 *nvp = nv; 166 return (0); 167 fail: 168 if (eb != NULL) 169 ebuf_free(eb); 170 return (-1); 171 } 172 173 int 174 hast_proto_recv_data(const struct hast_resource *res, struct proto_conn *conn, 175 struct nv *nv, void *data, size_t size) 176 { 177 unsigned int ii; 178 bool freedata; 179 size_t dsize; 180 void *dptr; 181 int ret; 182 183 PJDLOG_ASSERT(data != NULL); 184 PJDLOG_ASSERT(size > 0); 185 186 ret = -1; 187 freedata = false; 188 dptr = data; 189 190 dsize = nv_get_uint32(nv, "size"); 191 if (dsize > size) { 192 errno = EINVAL; 193 goto end; 194 } else if (dsize == 0) { 195 (void)nv_set_error(nv, 0); 196 } else { 197 if (proto_recv(conn, data, dsize) == -1) 198 goto end; 199 for (ii = sizeof(pipeline) / sizeof(pipeline[0]); ii > 0; 200 ii--) { 201 ret = pipeline[ii - 1].hps_recv(res, nv, &dptr, 202 &dsize, &freedata); 203 if (ret == -1) 204 goto end; 205 } 206 ret = -1; 207 if (dsize > size) { 208 errno = EINVAL; 209 goto end; 210 } 211 if (dptr != data) 212 bcopy(dptr, data, dsize); 213 } 214 215 ret = 0; 216 end: 217 if (freedata) 218 free(dptr); 219 return (ret); 220 } 221