Function processMultibulkBuffer

src/networking.cpp:2314–2458

Process the query buffer for client 'c', setting up the client argument * vector for command execution. Returns C_OK if after running the function * the client has a well-formed ready to be processed command, otherwise * C_ERR if there is still to read more buffer to get the full command. * The function also returns C_ERR when there is a protocol error: in such a * case the client structure i

 * command is in RESP format, so the first byte in the command is found
 * to be '*'. Otherwise for inline commands processInlineBuffer() is called. */
int processMultibulkBuffer(client *c) {
    char *newline = NULL;
    int ok;
    long long ll;

    if (c->multibulklen == 0) {
        /* The client should have been reset */
        serverAssertWithInfo(c,NULL,c->argc == 0);

        /* Multi bulk length cannot be read without a \r\n */
        newline = strchr(c->querybuf+c->qb_pos,'\r');
        if (newline == NULL) {
            if (sdslen(c->querybuf)-c->qb_pos > PROTO_INLINE_MAX_SIZE) {
                addReplyError(c,"Protocol error: too big mbulk count string");
                setProtocolError("too big mbulk count string",c);
            }
            return C_ERR;
        }

        /* Buffer should also contain \n */
        if (newline-(c->querybuf+c->qb_pos) > (ssize_t)(sdslen(c->querybuf)-c->qb_pos-2))
            return C_ERR;

        /* We know for sure there is a whole line since newline != NULL,
         * so go ahead and find out the multi bulk length. */
        serverAssertWithInfo(c,NULL,c->querybuf[c->qb_pos] == '*');
        ok = string2ll(c->querybuf+1+c->qb_pos,newline-(c->querybuf+1+c->qb_pos),&ll);
        if (!ok || ll > 1024*1024) {
            addReplyError(c,"Protocol error: invalid multibulk length");
            setProtocolError("invalid mbulk count",c);
            return C_ERR;
        } else if (ll > 10 && authRequired(c)) {
            addReplyError(c, "Protocol error: unauthenticated multibulk length");
            setProtocolError("unauth mbulk count", c);
            return C_ERR;
        }

        c->qb_pos = (newline-c->querybuf)+2;

        if (ll <= 0) return C_OK;

        c->multibulklen = ll;

        /* Setup argv array on client structure */
        c->vecqueuedcmd.emplace_back(c->multibulklen);
    }

    serverAssertWithInfo(c,NULL,c->multibulklen > 0);
    while(c->multibulklen) {
        /* Read bulk length if unknown */
        if (c->bulklen == -1) {
            newline = strchr(c->querybuf+c->qb_pos,'\r');
            if (newline == NULL) {
                if (sdslen(c->querybuf)-c->qb_pos > PROTO_INLINE_MAX_SIZE) {
                    addReplyError(c,
                        "Protocol error: too big bulk count string");
                    setProtocolError("too big bulk count string",c);
                    return C_ERR;