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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-13 12:18:05 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-13 12:18:05 +0000
commitb46aad6df449445a9fc4aa7b32bd40005438e3f7 (patch)
tree751aa858ca01f35de800164516b298887382919d /src/fix.c
parentInitial commit. (diff)
downloadhaproxy-b46aad6df449445a9fc4aa7b32bd40005438e3f7.tar.xz
haproxy-b46aad6df449445a9fc4aa7b32bd40005438e3f7.zip
Adding upstream version 2.9.5.upstream/2.9.5
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/fix.c')
-rw-r--r--src/fix.c264
1 files changed, 264 insertions, 0 deletions
diff --git a/src/fix.c b/src/fix.c
new file mode 100644
index 0000000..abf3119
--- /dev/null
+++ b/src/fix.c
@@ -0,0 +1,264 @@
+/*
+ * Financial Information eXchange Protocol
+ *
+ * Copyright 2020 Baptiste Assmann <bedis9@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
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#include <haproxy/intops.h>
+#include <haproxy/fix.h>
+/*
+ * Return the corresponding numerical tag id if <str> looks like a valid FIX
+ * protocol tag ID. Otherwise, 0 is returned (0 is an invalid id).
+ *
+ * If <version> is given, it must be one of a defined FIX version string (see
+ * FIX_X_Y macros). In this case, the function will also check tag ID ranges. If
+ * no <version> is provided, any strictly positive integer is valid.
+ *
+ * tag ID range depends on FIX protocol version:
+ * - FIX.4.0: 1-140
+ * - FIX.4.1: 1-211
+ * - FIX.4.2: 1-446
+ * - FIX.4.3: 1-659
+ * - FIX.4.4: 1-956
+ * - FIX.5.0: 1-1139
+ * - FIX.5.0SP1: 1-1426
+ * - FIX.5.0SP2: 1-1621
+ * range 10000 to 19999 is for "user defined tags"
+ */
+unsigned int fix_check_id(const struct ist str, const struct ist version) {
+ const char *s, *end;
+ unsigned int ret;
+
+ s = istptr(str);
+ end = istend(str);
+ ret = read_uint(&s, end);
+
+ /* we did not consume all characters from <str>, this is an error */
+ if (s != end)
+ return 0;
+
+ /* field ID can't be 0 */
+ if (ret == 0)
+ return 0;
+
+ /* we can leave now if version was not provided */
+ if (!isttest(version))
+ return ret;
+
+ /* we can leave now if this is a "user defined tag id" */
+ if (ret >= 10000 && ret <= 19999)
+ return ret;
+
+ /* now perform checking per FIX version */
+ if (istissame(FIX_4_0, version) && (ret <= 140))
+ return ret;
+ else if (istissame(FIX_4_1, version) && (ret <= 211))
+ return ret;
+ else if (istissame(FIX_4_2, version) && (ret <= 446))
+ return ret;
+ else if (istissame(FIX_4_3, version) && (ret <= 659))
+ return ret;
+ else if (istissame(FIX_4_4, version) && (ret <= 956))
+ return ret;
+ /* version string is the same for all 5.0 versions, so we can only take
+ * into consideration the biggest range
+ */
+ else if (istissame(FIX_5_0, version) && (ret <= 1621))
+ return ret;
+
+ return 0;
+}
+
+/*
+ * Parse a FIX message <msg> and performs following sanity checks:
+ *
+ * - checks tag ids and values are not empty
+ * - checks tag ids are numerical value
+ * - checks the first tag is BeginString with a valid version
+ * - checks the second tag is BodyLength with the right body length
+ * - checks the third tag is MsgType
+ * - checks the last tag is CheckSum with a valid checksum
+ *
+ * Returns:
+ * FIX_INVALID_MESSAGE if the message is invalid
+ * FIX_NEED_MORE_DATA if we need more data to fully validate the message
+ * FIX_VALID_MESSAGE if the message looks valid
+ */
+int fix_validate_message(const struct ist msg)
+{
+ struct ist parser, version;
+ unsigned int tagnum, bodylen;
+ unsigned char checksum;
+ char *body;
+ int ret = FIX_INVALID_MESSAGE;
+
+ if (istlen(msg) < FIX_MSG_MINSIZE) {
+ ret = FIX_NEED_MORE_DATA;
+ goto end;
+ }
+
+ /* parsing the whole message to compute the checksum and check all tag
+ * ids are properly set. Here we are sure to have the 2 first tags. Thus
+ * the version and the body length can be checked.
+ */
+ parser = msg;
+ version = IST_NULL;
+ checksum = tagnum = bodylen = 0;
+ body = NULL;
+ while (istlen(parser) > 0) {
+ struct ist tag, value;
+ unsigned int tagid;
+ const char *p, *end;
+
+ /* parse the tag ID and its value and perform first sanity checks */
+ value = iststop(istfind(parser, '='), FIX_DELIMITER);
+
+ /* end of value not found */
+ if (istend(value) == istend(parser)) {
+ ret = FIX_NEED_MORE_DATA;
+ goto end;
+ }
+ /* empty tag or empty value are forbidden */
+ if (istptr(parser) == istptr(value) ||!istlen(value))
+ goto end;
+
+ /* value points on '='. get the tag and skip '=' */
+ tag = ist2(istptr(parser), istptr(value) - istptr(parser));
+ value = istnext(value);
+
+ /* Check the tag id */
+ tagid = fix_check_id(tag, version);
+ if (!tagid)
+ goto end;
+ tagnum++;
+
+ if (tagnum == 1) {
+ /* the first tag must be BeginString */
+ if (tagid != FIX_TAG_BeginString)
+ goto end;
+
+ version = fix_version(value);
+ if (!isttest(version))
+ goto end;
+ }
+ else if (tagnum == 2) {
+ /* the second tag must be bodyLength */
+ if (tagid != FIX_TAG_BodyLength)
+ goto end;
+
+ p = istptr(value);
+ end = istend(value);
+ bodylen = read_uint(&p, end);
+
+ /* we did not consume all characters from <str> or no body, this is an error.
+ * There is at least the message type in the body.
+ */
+ if (p != end || !bodylen)
+ goto end;
+
+ body = istend(value) + 1;
+ }
+ else if (tagnum == 3) {
+ /* the third tag must be MsgType */
+ if (tagid != FIX_TAG_MsgType)
+ goto end;
+ }
+ else if (tagnum > 3 && tagid == FIX_TAG_CheckSum) {
+ /* CheckSum tag should be the last one and is not taken into account
+ * to compute the checksum itself and the body length. The value is
+ * a three-octet representation of the checksum decimal value.
+ */
+ if (bodylen != istptr(parser) - body)
+ goto end;
+
+ if (istlen(value) != 3)
+ goto end;
+ if (checksum != strl2ui(istptr(value), istlen(value)))
+ goto end;
+
+ /* End of the message, exit from the loop */
+ ret = FIX_VALID_MESSAGE;
+ goto end;
+ }
+
+ /* compute checksum of tag=value<delim> */
+ for (p = istptr(tag) ; p < istend(tag) ; ++p)
+ checksum += *p;
+ checksum += '=';
+ for (p = istptr(value) ; p < istend(value) ; ++p)
+ checksum += *p;
+ checksum += FIX_DELIMITER;
+
+ /* move the parser after the value and its delimiter */
+ parser = istadv(parser, istlen(tag) + istlen(value) + 2);
+ }
+
+ if (body) {
+ /* We start to read the body but we don't reached the checksum tag */
+ ret = FIX_NEED_MORE_DATA;
+ }
+
+ end:
+ return ret;
+}
+
+
+/*
+ * Iter on a FIX message <msg> and return the value of <tagid>.
+ *
+ * Returns the corresponding value if <tagid> is found. If <tagid> is not found
+ * because more data are required, the message with a length set to 0 is
+ * returned. If <tagid> is not found in the message or if the message is
+ * invalid, IST_NULL is returned.
+ *
+ * Note: Only simple sanity checks are performed on tags and values (not empty).
+ *
+ * the tag looks like
+ * <tagid>=<value>FIX_DELIMITER with <tag> and <value> not empty
+ */
+struct ist fix_tag_value(const struct ist msg, unsigned int tagid)
+{
+ struct ist parser, t, v;
+ unsigned int id;
+
+ parser = msg;
+ while (istlen(parser) > 0) {
+ v = iststop(istfind(parser, '='), FIX_DELIMITER);
+
+ /* delimiter not found, need more data */
+ if (istend(v) == istend(parser))
+ break;
+
+ /* empty tag or empty value, invalid */
+ if (istptr(parser) == istptr(v) || !istlen(v))
+ goto not_found_or_invalid;
+
+ t = ist2(istptr(parser), istptr(v) - istptr(parser));
+ v = istnext(v);
+
+ id = fix_check_id(t, IST_NULL);
+ if (!id)
+ goto not_found_or_invalid;
+ if (id == tagid) {
+ /* <tagId> found, return the corresponding value */
+ return v;
+ }
+
+ /* CheckSum tag is the last one, no <tagid> found */
+ if (id == FIX_TAG_CheckSum)
+ goto not_found_or_invalid;
+
+ parser = istadv(parser, istlen(t) + istlen(v) + 2);
+ }
+ /* not enough data to find <tagid> */
+ return ist2(istptr(msg), 0);
+
+ not_found_or_invalid:
+ return IST_NULL;
+}