lilleman
45d2f5548e
* Regression tests for a receipt body read under a data_coding it is not written in * Read a delivery receipt's body as the octets that arrived, not by its data_coding * Assert SMPPSim's UCS2 receipt body parses like every other segment's * Record the receipt-body defect as fixed * Retain a multipart segment's octets once, not twice * Sort the new type import into its file's order
58 lines
2.0 KiB
TypeScript
58 lines
2.0 KiB
TypeScript
import type { CommandName } from './defs/commands.ts';
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import type { ErrorName } from './defs/errors.ts';
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import { respNameFor } from './defs/commands.ts';
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/** A hostile peer must not be able to make us allocate arbitrarily. */
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export const maxPduLength = 1024 * 1024;
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/** The 16 octets a framed PDU always has, whatever its body turns out to be. */
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export type PduHeader = {
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cmdId: number;
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cmdLength: number;
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cmdName: CommandName | undefined;
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cmdStatusId: number;
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seqNr: number;
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};
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/** Which part of a PDU the codec could not read. */
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export type PduRefusalReason = 'body' | 'command' | 'tlvs';
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/** A PDU refused with the stream still in sync, so only this one PDU is lost. */
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export class PduRefusedError extends Error {
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readonly header: PduHeader;
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readonly reason: PduRefusalReason;
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constructor(header: PduHeader, reason: PduRefusalReason, cause: Error) {
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const named = header.cmdName ?? `command id ${String(header.cmdId)}`;
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super(`Refused ${named} with seqNr ${String(header.seqNr)}: ${cause.message}`, { cause });
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this.header = header;
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this.name = 'PduRefusedError';
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this.reason = reason;
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}
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}
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// ESME_RINVTLVSTREAM is SMPP 5.0's name for 0xC0, which SMPP 3.4 spells ESME_RINVOPTPARSTREAM.
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const refusalStatus = {
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body: 'ESME_RINVCMDLEN',
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command: 'ESME_RINVCMDID',
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tlvs: 'ESME_RINVTLVSTREAM',
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} as const satisfies Record<PduRefusalReason, ErrorName>;
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/** Why a command_length cannot frame a stream: past it nothing can say where the next PDU starts. */
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export function framingRefusal(cmdLength: number): Error | undefined {
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if (cmdLength < 16 || cmdLength > maxPduLength) {
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return new Error(`Refusing a cmd_length of ${String(cmdLength)}`);
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}
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return undefined;
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}
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/** SMPP 3.4 4.3: a PDU whose command has no response of its own is refused with generic_nack. */
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export function refusalAnswer(refused: PduRefusedError): { cmdName: CommandName; cmdStatus: ErrorName } {
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return {
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cmdName: respNameFor(refused.header.cmdName) ?? 'generic_nack',
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cmdStatus: refusalStatus[refused.reason],
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};
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}
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