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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 06:33:50 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 06:33:50 +0000 |
commit | fe39ffb8b90ae4e002ed73fe98617cd590abb467 (patch) | |
tree | b80e5956907d8aeaaffe4e4f0c068c0e6157ce8b /modules/proxy/ajp_msg.c | |
parent | Initial commit. (diff) | |
download | apache2-upstream/2.4.56.tar.xz apache2-upstream/2.4.56.zip |
Adding upstream version 2.4.56.upstream/2.4.56upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'modules/proxy/ajp_msg.c')
-rw-r--r-- | modules/proxy/ajp_msg.c | 641 |
1 files changed, 641 insertions, 0 deletions
diff --git a/modules/proxy/ajp_msg.c b/modules/proxy/ajp_msg.c new file mode 100644 index 0000000..3367b5d --- /dev/null +++ b/modules/proxy/ajp_msg.c @@ -0,0 +1,641 @@ +/* Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You 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. + */ + +#include "ajp.h" + +APLOG_USE_MODULE(proxy_ajp); + +#define AJP_MSG_DUMP_BYTES_PER_LINE 16 +/* 2 hex digits plus space plus one char per dumped byte */ +/* plus prefix plus separator plus '\0' */ +#define AJP_MSG_DUMP_PREFIX_LENGTH strlen("XXXX ") +#define AJP_MSG_DUMP_LINE_LENGTH ((AJP_MSG_DUMP_BYTES_PER_LINE * \ + strlen("XX .")) + \ + AJP_MSG_DUMP_PREFIX_LENGTH + \ + strlen(" - ") + 1) + +static char *hex_table = "0123456789ABCDEF"; + +/** + * Dump the given number of bytes on an AJP Message + * + * @param pool pool to allocate from + * @param msg AJP Message to dump + * @param err error string to display + * @param count the number of bytes to dump + * @param buf buffer pointer for dump message + * @return APR_SUCCESS or error + */ +apr_status_t ajp_msg_dump(apr_pool_t *pool, ajp_msg_t *msg, char *err, + apr_size_t count, char **buf) +{ + apr_size_t i, j; + char *current; + apr_size_t bl, rl; + apr_byte_t x; + apr_size_t len = msg->len; + apr_size_t line_len; + + /* Display only first "count" bytes */ + if (len > count) + len = count; + /* First the space needed for the first line */ + bl = strlen(err) + 3 * (strlen(" XXX=") + 20) + 1 + + /* Now for the data lines */ + (len + 15) / 16 * AJP_MSG_DUMP_LINE_LENGTH; + *buf = apr_palloc(pool, bl); + if (!*buf) + return APR_ENOMEM; + apr_snprintf(*buf, bl, + "%s pos=%" APR_SIZE_T_FMT + " len=%" APR_SIZE_T_FMT " max=%" APR_SIZE_T_FMT "\n", + err, msg->pos, msg->len, msg->max_size); + current = *buf + strlen(*buf); + for (i = 0; i < len; i += AJP_MSG_DUMP_BYTES_PER_LINE) { + /* Safety check: do we have enough buffer for another line? */ + rl = bl - (current - *buf); + if (AJP_MSG_DUMP_LINE_LENGTH > rl) { + *(current - 1) = '\0'; + return APR_ENOMEM; + } + apr_snprintf(current, rl, "%.4lx ", (unsigned long)i); + current += AJP_MSG_DUMP_PREFIX_LENGTH; + line_len = len - i; + if (line_len > AJP_MSG_DUMP_BYTES_PER_LINE) { + line_len = AJP_MSG_DUMP_BYTES_PER_LINE; + } + for (j = 0; j < line_len; j++) { + x = msg->buf[i + j]; + + *current++ = hex_table[x >> 4]; + *current++ = hex_table[x & 0x0f]; + *current++ = ' '; + } + *current++ = ' '; + *current++ = '-'; + *current++ = ' '; + for (j = 0; j < line_len; j++) { + x = msg->buf[i + j]; + + if (x > 0x20 && x < 0x7F) { + *current++ = x; + } + else { + *current++ = '.'; + } + } + *current++ = '\n'; + } + *(current - 1) = '\0'; + + return APR_SUCCESS; +} + +/** + * Log an AJP message + * + * @param request The current request + * @param msg AJP Message to dump + * @param err error string to display + * @return APR_SUCCESS or error + */ +apr_status_t ajp_msg_log(request_rec *r, ajp_msg_t *msg, char *err) +{ + int level; + apr_size_t count; + char *buf, *next; + apr_status_t rc = APR_SUCCESS; + + if (APLOGrtrace7(r)) { + level = APLOG_TRACE7; + count = 1024; + if (APLOGrtrace8(r)) { + level = APLOG_TRACE8; + count = AJP_MAX_BUFFER_SZ; + } + rc = ajp_msg_dump(r->pool, msg, err, count, &buf); + if (rc == APR_SUCCESS) { + while ((next = ap_strchr(buf, '\n'))) { + *next = '\0'; + /* Intentional no APLOGNO */ + ap_log_rerror(APLOG_MARK, level, 0, r, "%s", buf); + buf = next + 1; + } + /* Intentional no APLOGNO */ + ap_log_rerror(APLOG_MARK, level, 0, r, "%s", buf); + } + } + return rc; +} + +/** + * Check a new AJP Message by looking at signature and return its size + * + * @param msg AJP Message to check + * @param len Pointer to returned len + * @return APR_SUCCESS or error + */ +apr_status_t ajp_msg_check_header(ajp_msg_t *msg, apr_size_t *len) +{ + apr_byte_t *head = msg->buf; + apr_size_t msglen; + + if (!((head[0] == 0x41 && head[1] == 0x42) || + (head[0] == 0x12 && head[1] == 0x34))) { + + ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL, APLOGNO(01080) + "ajp_msg_check_header() got bad signature %02x%02x", + head[0], head[1]); + + return AJP_EBAD_SIGNATURE; + } + + msglen = ((head[2] & 0xff) << 8); + msglen += (head[3] & 0xFF); + + if (msglen > msg->max_size) { + ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL, APLOGNO(01081) + "ajp_msg_check_header() incoming message is " + "too big %" APR_SIZE_T_FMT ", max is %" APR_SIZE_T_FMT, + msglen, msg->max_size); + return AJP_ETOBIG; + } + + msg->len = msglen + AJP_HEADER_LEN; + msg->pos = AJP_HEADER_LEN; + *len = msglen; + + return APR_SUCCESS; +} + +/** + * Reset an AJP Message + * + * @param msg AJP Message to reset + * @return APR_SUCCESS or error + */ +apr_status_t ajp_msg_reset(ajp_msg_t *msg) +{ + msg->len = AJP_HEADER_LEN; + msg->pos = AJP_HEADER_LEN; + + return APR_SUCCESS; +} + +/** + * Reuse an AJP Message + * + * @param msg AJP Message to reuse + * @return APR_SUCCESS or error + */ +apr_status_t ajp_msg_reuse(ajp_msg_t *msg) +{ + apr_byte_t *buf; + apr_size_t max_size; + + buf = msg->buf; + max_size = msg->max_size; + memset(msg, 0, sizeof(ajp_msg_t)); + msg->buf = buf; + msg->max_size = max_size; + msg->header_len = AJP_HEADER_LEN; + ajp_msg_reset(msg); + return APR_SUCCESS; +} + +/** + * Mark the end of an AJP Message + * + * @param msg AJP Message to end + * @return APR_SUCCESS or error + */ +apr_status_t ajp_msg_end(ajp_msg_t *msg) +{ + apr_size_t len = msg->len - AJP_HEADER_LEN; + + if (msg->server_side) { + msg->buf[0] = 0x41; + msg->buf[1] = 0x42; + } + else { + msg->buf[0] = 0x12; + msg->buf[1] = 0x34; + } + + msg->buf[2] = (apr_byte_t)((len >> 8) & 0xFF); + msg->buf[3] = (apr_byte_t)(len & 0xFF); + + return APR_SUCCESS; +} + +static APR_INLINE int ajp_log_overflow(ajp_msg_t *msg, const char *context) +{ + ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL, APLOGNO(03229) + "%s(): BufferOverflowException %" APR_SIZE_T_FMT + " %" APR_SIZE_T_FMT, + context, msg->pos, msg->len); + return AJP_EOVERFLOW; +} + +/** + * Add an unsigned 32bits value to AJP Message + * + * @param msg AJP Message to get value from + * @param value value to add to AJP Message + * @return APR_SUCCESS or error + */ +apr_status_t ajp_msg_append_uint32(ajp_msg_t *msg, apr_uint32_t value) +{ + apr_size_t len = msg->len; + + if ((len + 4) > msg->max_size) { + return ajp_log_overflow(msg, "ajp_msg_append_uint32"); + } + + msg->buf[len] = (apr_byte_t)((value >> 24) & 0xFF); + msg->buf[len + 1] = (apr_byte_t)((value >> 16) & 0xFF); + msg->buf[len + 2] = (apr_byte_t)((value >> 8) & 0xFF); + msg->buf[len + 3] = (apr_byte_t)(value & 0xFF); + + msg->len += 4; + + return APR_SUCCESS; +} + +/** + * Add an unsigned 16bits value to AJP Message + * + * @param msg AJP Message to get value from + * @param value value to add to AJP Message + * @return APR_SUCCESS or error + */ +apr_status_t ajp_msg_append_uint16(ajp_msg_t *msg, apr_uint16_t value) +{ + apr_size_t len = msg->len; + + if ((len + 2) > msg->max_size) { + return ajp_log_overflow(msg, "ajp_msg_append_uint16"); + } + + msg->buf[len] = (apr_byte_t)((value >> 8) & 0xFF); + msg->buf[len + 1] = (apr_byte_t)(value & 0xFF); + + msg->len += 2; + + return APR_SUCCESS; +} + +/** + * Add an unsigned 8bits value to AJP Message + * + * @param msg AJP Message to get value from + * @param value value to add to AJP Message + * @return APR_SUCCESS or error + */ +apr_status_t ajp_msg_append_uint8(ajp_msg_t *msg, apr_byte_t value) +{ + apr_size_t len = msg->len; + + if ((len + 1) > msg->max_size) { + return ajp_log_overflow(msg, "ajp_msg_append_uint8"); + } + + msg->buf[len] = value; + msg->len += 1; + + return APR_SUCCESS; +} + +/** + * Add a String in AJP message, and transform the String in ASCII + * if convert is set and we're on an EBCDIC machine + * + * @param msg AJP Message to get value from + * @param value Pointer to String + * @param convert When set told to convert String to ASCII + * @return APR_SUCCESS or error + */ +apr_status_t ajp_msg_append_string_ex(ajp_msg_t *msg, const char *value, + int convert) +{ + apr_size_t len; + + if (value == NULL) { + return(ajp_msg_append_uint16(msg, 0xFFFF)); + } + + len = strlen(value); + if ((msg->len + len + 3) > msg->max_size) { + return ajp_log_overflow(msg, "ajp_msg_append_cvt_string"); + } + + /* ignore error - we checked once */ + ajp_msg_append_uint16(msg, (apr_uint16_t)len); + + /* We checked for space !! */ + memcpy(msg->buf + msg->len, value, len + 1); /* including \0 */ + + if (convert) { + /* convert from EBCDIC if needed */ + ap_xlate_proto_to_ascii((char *)msg->buf + msg->len, len + 1); + } + + msg->len += len + 1; + + return APR_SUCCESS; +} + +/** + * Add a Byte array to AJP Message + * + * @param msg AJP Message to get value from + * @param value Pointer to Byte array + * @param valuelen Byte array len + * @return APR_SUCCESS or error + */ +apr_status_t ajp_msg_append_bytes(ajp_msg_t *msg, const apr_byte_t *value, + apr_size_t valuelen) +{ + if (! valuelen) { + return APR_SUCCESS; /* Shouldn't we indicate an error ? */ + } + + if ((msg->len + valuelen) > msg->max_size) { + return ajp_log_overflow(msg, "ajp_msg_append_bytes"); + } + + /* We checked for space !! */ + memcpy(msg->buf + msg->len, value, valuelen); + msg->len += valuelen; + + return APR_SUCCESS; +} + +/** + * Get a 32bits unsigned value from AJP Message + * + * @param msg AJP Message to get value from + * @param rvalue Pointer where value will be returned + * @return APR_SUCCESS or error + */ +apr_status_t ajp_msg_get_uint32(ajp_msg_t *msg, apr_uint32_t *rvalue) +{ + apr_uint32_t value; + + if ((msg->pos + 3) > msg->len) { + return ajp_log_overflow(msg, "ajp_msg_get_uint32"); + } + + value = ((msg->buf[(msg->pos++)] & 0xFF) << 24); + value |= ((msg->buf[(msg->pos++)] & 0xFF) << 16); + value |= ((msg->buf[(msg->pos++)] & 0xFF) << 8); + value |= ((msg->buf[(msg->pos++)] & 0xFF)); + + *rvalue = value; + return APR_SUCCESS; +} + + +/** + * Get a 16bits unsigned value from AJP Message + * + * @param msg AJP Message to get value from + * @param rvalue Pointer where value will be returned + * @return APR_SUCCESS or error + */ +apr_status_t ajp_msg_get_uint16(ajp_msg_t *msg, apr_uint16_t *rvalue) +{ + apr_uint16_t value; + + if ((msg->pos + 1) > msg->len) { + return ajp_log_overflow(msg, "ajp_msg_get_uint16"); + } + + value = ((msg->buf[(msg->pos++)] & 0xFF) << 8); + value += ((msg->buf[(msg->pos++)] & 0xFF)); + + *rvalue = value; + return APR_SUCCESS; +} + +/** + * Peek a 16bits unsigned value from AJP Message, position in message + * is not updated + * + * @param msg AJP Message to get value from + * @param rvalue Pointer where value will be returned + * @return APR_SUCCESS or error + */ +apr_status_t ajp_msg_peek_uint16(ajp_msg_t *msg, apr_uint16_t *rvalue) +{ + apr_uint16_t value; + + if ((msg->pos + 1) > msg->len) { + return ajp_log_overflow(msg, "ajp_msg_peek_uint16"); + } + + value = ((msg->buf[(msg->pos)] & 0xFF) << 8); + value += ((msg->buf[(msg->pos + 1)] & 0xFF)); + + *rvalue = value; + return APR_SUCCESS; +} + +/** + * Peek a 8bits unsigned value from AJP Message, position in message + * is not updated + * + * @param msg AJP Message to get value from + * @param rvalue Pointer where value will be returned + * @return APR_SUCCESS or error + */ +apr_status_t ajp_msg_peek_uint8(ajp_msg_t *msg, apr_byte_t *rvalue) +{ + if (msg->pos > msg->len) { + return ajp_log_overflow(msg, "ajp_msg_peek_uint8"); + } + + *rvalue = msg->buf[msg->pos]; + return APR_SUCCESS; +} + +/** + * Get a 8bits unsigned value from AJP Message + * + * @param msg AJP Message to get value from + * @param rvalue Pointer where value will be returned + * @return APR_SUCCESS or error + */ +apr_status_t ajp_msg_get_uint8(ajp_msg_t *msg, apr_byte_t *rvalue) +{ + + if (msg->pos > msg->len) { + return ajp_log_overflow(msg, "ajp_msg_get_uint8"); + } + + *rvalue = msg->buf[msg->pos++]; + return APR_SUCCESS; +} + + +/** + * Get a String value from AJP Message + * + * @param msg AJP Message to get value from + * @param rvalue Pointer where value will be returned + * @return APR_SUCCESS or error + */ +apr_status_t ajp_msg_get_string(ajp_msg_t *msg, const char **rvalue) +{ + apr_uint16_t size; + apr_size_t start; + apr_status_t status; + + status = ajp_msg_get_uint16(msg, &size); + start = msg->pos; + + if ((status != APR_SUCCESS) || (size + start > msg->max_size)) { + return ajp_log_overflow(msg, "ajp_msg_get_string"); + } + + msg->pos += (apr_size_t)size; + msg->pos++; /* a String in AJP is NULL terminated */ + + *rvalue = (const char *)(msg->buf + start); + return APR_SUCCESS; +} + + +/** + * Get a Byte array from AJP Message + * + * @param msg AJP Message to get value from + * @param rvalue Pointer where value will be returned + * @param rvalueLen Pointer where Byte array len will be returned + * @return APR_SUCCESS or error + */ +apr_status_t ajp_msg_get_bytes(ajp_msg_t *msg, apr_byte_t **rvalue, + apr_size_t *rvalue_len) +{ + apr_uint16_t size; + apr_size_t start; + apr_status_t status; + + status = ajp_msg_get_uint16(msg, &size); + /* save the current position */ + start = msg->pos; + + if ((status != APR_SUCCESS) || (size + start > msg->max_size)) { + return ajp_log_overflow(msg, "ajp_msg_get_bytes"); + } + msg->pos += (apr_size_t)size; /* only bytes, no trailer */ + + *rvalue = msg->buf + start; + *rvalue_len = size; + + return APR_SUCCESS; +} + + +/** + * Create an AJP Message from pool + * + * @param pool memory pool to allocate AJP message from + * @param size size of the buffer to create + * @param rmsg Pointer to newly created AJP message + * @return APR_SUCCESS or error + */ +apr_status_t ajp_msg_create(apr_pool_t *pool, apr_size_t size, ajp_msg_t **rmsg) +{ + ajp_msg_t *msg = (ajp_msg_t *)apr_pcalloc(pool, sizeof(ajp_msg_t)); + + msg->server_side = 0; + + msg->buf = (apr_byte_t *)apr_palloc(pool, size); + msg->len = 0; + msg->header_len = AJP_HEADER_LEN; + msg->max_size = size; + *rmsg = msg; + + return APR_SUCCESS; +} + +/** + * Recopy an AJP Message to another + * + * @param smsg source AJP message + * @param dmsg destination AJP message + * @return APR_SUCCESS or error + */ +apr_status_t ajp_msg_copy(ajp_msg_t *smsg, ajp_msg_t *dmsg) +{ + if (smsg->len > smsg->max_size) { + ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL, APLOGNO(01082) + "ajp_msg_copy(): destination buffer too " + "small %" APR_SIZE_T_FMT ", max size is %" APR_SIZE_T_FMT, + smsg->len, smsg->max_size); + return AJP_ETOSMALL; + } + + memcpy(dmsg->buf, smsg->buf, smsg->len); + dmsg->len = smsg->len; + dmsg->pos = smsg->pos; + + return APR_SUCCESS; +} + + +/** + * Serialize in an AJP Message a PING command + * + * +-----------------------+ + * | PING CMD (1 byte) | + * +-----------------------+ + * + * @param smsg AJP message to put serialized message + * @return APR_SUCCESS or error + */ +apr_status_t ajp_msg_serialize_ping(ajp_msg_t *msg) +{ + apr_status_t rc; + ajp_msg_reset(msg); + + if ((rc = ajp_msg_append_uint8(msg, CMD_AJP13_PING)) != APR_SUCCESS) + return rc; + + return APR_SUCCESS; +} + +/** + * Serialize in an AJP Message a CPING command + * + * +-----------------------+ + * | CPING CMD (1 byte) | + * +-----------------------+ + * + * @param smsg AJP message to put serialized message + * @return APR_SUCCESS or error + */ +apr_status_t ajp_msg_serialize_cping(ajp_msg_t *msg) +{ + apr_status_t rc; + ajp_msg_reset(msg); + + if ((rc = ajp_msg_append_uint8(msg, CMD_AJP13_CPING)) != APR_SUCCESS) + return rc; + + return APR_SUCCESS; +} |