initial very early WIP for parsing T.62 messages/parameters
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#include <osmocom/core/utils.h>
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#include "t62.h"
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/* T.61 Table 1 */
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const struct value_string t62_session_element_id_str[] = {
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{ T62_SID_CSS, "Command Session Start" },
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{ T62_SID_CSE, "Command Session End" },
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{ T62_SID_CSA, "Command Session Abort" },
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{ T62_SID_CSCC, "Command Session Change Control" },
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{ T62_SID_CSUI, "Command Session User Information" },
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{ T62_SID_RSSP, "Response Session Start Positive" },
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{ T62_SID_RSSN, "Response Session Start Negative" },
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{ T62_SID_RSEP, "Response Session End Positive" },
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{ T62_SID_RSAP, "Response Session Abort Positive" },
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{ T62_SID_RSCCP,"Response Session Change Control Positive" },
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{ T62_SID_RSUI, "Response Session User Information" },
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{ 0, NULL }
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};
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/* T.62 Table 2 */
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const struct value_string t62_command_resp_str[] = {
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{ T62_DCID_CDS, "Command Document Start" },
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{ T62_DCID_CDC, "Command Document Continue" },
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{ T62_DCID_CDE, "Command Document End" },
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{ T62_DCID_CDR, "Command Document Resynchronize" },
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{ T62_DCID_CDD, "Command Document Discard" },
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{ T62_DCID_CDPB, "Command Document Page Boundary" },
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{ T62_DCID_CDCL, "Command Document Capability List" },
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{ T62_DCID_CDUI, "Command Document User Information" },
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{ T62_DRID_RDEP, "Response Document End Positive" },
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{ T62_DRID_RDRP, "Response Document Resynchronize Positive" },
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{ T62_DRID_RDDP, "Response Document Discard Positive" },
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{ T62_DRID_RDPBP, "Response Document Page Boundary Positive" },
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{ T62_DRID_RDPBN, "Response Document Page Boundary Negative" },
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{ T62_DRID_RDCLP, "Response Document Capability List Positive" },
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{ T62_DRID_RDGR, "Response Document General Reject" },
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{ 0, NULL }
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};
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struct t62_part {
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struct llist_head list;
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struct t62_part *parent;
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uint8_t id;
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const uint8_t *data;
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uint16_t data_len;
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struct llist_head children;
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};
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static struct t62_part *t62_part_alloc(void *ctx, struct t62_part *parent)
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{
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struct t62_part *part = talloc_zero(ctx, struct t62_part);
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if (!part)
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return NULL;
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if (parent) {
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part->parent = parent;
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llist_add_tail(&part->list, &parent->children);
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}
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INIT_LLIST_HEAD(&part->children);
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return part;
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}
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static void t62_part_free(struct t62_part *part)
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{
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if (part->parent)
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llist_del(&part->list);
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talloc_free(part);
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}
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/*! parse one T.62 parameter from msg starting at cur. Recurse if parameter is Parameter Group.
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* \param[in] msg message buffer holding input data
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* \param[in] cur pointer pointing to first byte of param (PI/PGI) inside msg
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* \param[in] parent optional pointer to parent t62_part (in case of nesting)
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* \returns parsed t62_param or NULL in case of error. */
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struct t62_part *t62_parse_param(struct msgb *msg, uint8_t *cur, struct llist_head *parent)
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{
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struct t62_part *part = t62_part_alloc(parent, parent);
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uint8_t pi;
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uint16_t len;
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/* FIXME: check msgb->length overflow everywhere below */
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pi = *cur++;
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if (*cur <= 254) {
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/* 8-bit length */
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len = *cur++;
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} else {
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/* 16-bit length */
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cur++;
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len = *cur++ << 8;
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len |= *cur++;
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}
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part->id = pi;
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if (len) {
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part->data = cur;
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part->data_len = len;
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if (is_pgi(pi)) {
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/* recurse if it's a group */
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rc = t62_parse_param(msg, cur, part);
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if (rc < 0) {
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t62_part_free(part);
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return NULL;
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}
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}
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}
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return part;
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}
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int t62_parse(struct msgb *msg, struct llist_head *parent)
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{
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uint8_t *cur;
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uint8_t ci;
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uint16_t len;
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cur = msgb_l3h(msg);
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root_part = t62_parse_param(msg, cur, NULL);
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if (!root_part)
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return -1;
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/* check if there's user information after all (recursive) parts */
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if (cur + root_part->data_len < msgb_l3len(msg)) {
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/* FIXME */
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}
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}
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@ -0,0 +1,108 @@
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/* T.62 Table 4 */
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enum t62_session_element_id {
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T62_SID_CSS = 0x0d,
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T62_SID_CSE = 0x09,
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T62_SID_CSA = 0x19,
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T62_SID_CSCC = 0x15,
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T62_SID_CSUI = 0x01,
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T62_SID_RSSP = 0x0e,
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T62_SID_RSSN = 0x0c,
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T62_SID_RSEP = 0x0a,
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T62_SID_RSAP = 0x1a,
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T62_SID_RSCCP = 0x16,
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T62_SID_RSUI = 0x02,
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};
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/* T.62 Table 5 */
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enum t62_document_cmd_id {
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T62_DCID_CDS = 0x2d,
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T62_DCID_CDC = 0x1d,
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T62_DCID_CDE = 0x29,
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T62_DCID_CDR = 0x19,
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T62_DCID_CDD = 0x39,
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T62_DCID_CDPB = 0x31,
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T62_DCID_CDCL = 0x3d,
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T62_DCID_CDUI = 0x01,
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};
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/* T.62 Table 6 */
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enum t62_document_cmd_id {
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T62_DRID_RDEP = 0x2a,
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T62_DRID_RDRP = 0x1a,
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T62_DRID_RDDP = 0x3a,
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T62_DRID_RDPBP = 0x32,
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T62_DRID_RDPBN = 0x30,
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T62_DRID_RDCLP = 0x3e,
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T62_DRID_RDGR = 0x00,
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};
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/* T.62 Table 7 + 8 */
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enum t62_param_group_id {
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T62_PGI_RES_FOR_EXT = 0x00,
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T62_PGI_SESSION_REF = 0x01,
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T62_PGI_NON_BASIC_SESSION_CAP = 0x02,
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T62_PGI_NON_BASIC_TELETEX_CAP = 0x41,
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T62_PGI_SESSION_USER_DATA = 0xc1,
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T62_PGI_DOCUMENT_LINKING = 0x21,
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T62_PGI_DOCUMENT_LINKING = 0x21,
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};
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/* T.62 Table 7 + 8 */
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enum t62_param_id {
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/* T62_PGI_SESSION_REF */
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T62_PI_TI_OF_CALLED = 0x09,
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T62_PI_TI_OF_CALLING = 0x0a,
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T62_PI_DATE_AND_TIME = 0x0b,
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T62_PI_ADDL_SESSION_REF_NR = 0x0c,
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T62_PI_DOCUMENT_REF_NR = 0x29,
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T62_PI_CHECKPOINT_REF_NR = 0x2a,
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/* T62_PGI_NON_BASIC_SESSION_CAP */
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T62_PI_MISC_SESSION_CAP = 0x0d,
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T62_PI_WINDOW_SIZE = 0x0e,
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/* No PGI associated with these PIs */
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T62_PI_SERVICE_ID = 0x08,
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T62_PI_SESSION_CTRL_FUNCT = 0x10,
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T62_PI_SESSION_TERM_PARAM = 0x11,
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T62_PI_INACTIVITY_TIMER = 0x12,
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T62_PI_SESSION_SERVICE_FUNCT = 0x14,
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T62_PI_SERVICE_INTERWORKING_ID = 0x28,
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T62_PI_ACCEPT_OF_CDCL_PARAMS = 0x2c,
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T62_PI_STORAGE_CAPACITY_NEGOT = 0x2d,
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T62_PI_RX_ABILITY_JEOPARDIZED = 0x2e,
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T62_PI_RESERVED = 0x2f,
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T62_PI_DOCUMENT_TYPE_ID = 0x30,
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T62_PI_REFLECT_PARAMETER_VALUES = 0x31,
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T62_PI_REASON = 0x32,
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/* T62_PGI_NON_BASIC_TELETEX_CAP */
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T62_PI_GRAPHIC_CHARACTER_SET = 0x41,
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T62_PI_CONTROL_CHARACTER_SET = 0x49,
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T62_PI_TELETEX_PAGE_FORMAT = 0x4a,
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T62_PI_MISC_TELETEX_TERM_CAP = 0x4b,
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T62_PI_CHARACTER_BOX_HEIGHT = 0x4d,
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T62_PI_CHARACTER_BOX_WIDTH = 0x4e,
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};
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/* TODO: Table 9/10: Mandatory PI for each procedure */
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/* 5.7.2.7 */
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enum t62_service_id {
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T62_SERVICE_ID_TELEMATIC = 0x01,
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};
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/* 5.7.2.10 (reason) */
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enum t62_reason {
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T62_REASON_NO_SPECIFIC_REASON = 0x00,
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T62_REASON_TEMP_UNABLE_TO_ENTER_CONTINUE_SESSION = 0x01,
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T62_REASON_EXPL_TEXT_MESSAGE_ONLY_FOR_USE_WITH_RSSN = 0x02,
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T62_REASON_SEQUENCE_ERROR = 0x03,
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T62_REASON_LOCAL_TERMINAL_ERROR = 0x05,
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T62_REASON_UNRECOVERABLE_PROCEDURAL_ERROR = 0x06,
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};
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/* 5.7.3.7 Document type identifier */
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enum t62_document_type_id {
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T62_DOC_T_OPERATOR = 0x01,
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T62_DOC_T_CONTROL = 0x02,
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T62_DOC_T_MONITOR = 0x03,
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};
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