Function ACLAppendUserForLoading

app/redis-6.2.6/src/acl.c:1404–1431

Given an argument vector describing a user in the form: * * user ... ACL rules and flags ... * * this function validates, and if the syntax is valid, appends * the user definition to a list for later loading. * * The rules are tested for validity and if there obvious syntax errors * the function returns C_ERR and does nothing, otherwise C_OK is returned * and the user is a

 * by reference (if not set to NULL) the argc_err argument with the index
 * of the argv vector that caused the error. */
int ACLAppendUserForLoading(sds *argv, int argc, int *argc_err) {
    if (argc < 2 || strcasecmp(argv[0],"user")) {
        if (argc_err) *argc_err = 0;
        return C_ERR;
    }

    /* Try to apply the user rules in a fake user to see if they
     * are actually valid. */
    user *fakeuser = ACLCreateUnlinkedUser();

    for (int j = 2; j < argc; j++) {
        if (ACLSetUser(fakeuser,argv[j],sdslen(argv[j])) == C_ERR) {
            if (errno != ENOENT) {
                ACLFreeUser(fakeuser);
                if (argc_err) *argc_err = j;
                return C_ERR;
            }
        }
    }

    /* Rules look valid, let's append the user to the list. */
    sds *copy = zmalloc(sizeof(sds)*argc);
    for (int j = 1; j < argc; j++) copy[j-1] = sdsdup(argv[j]);
    copy[argc-1] = NULL;
    listAddNodeTail(UsersToLoad,copy);
    ACLFreeUser(fakeuser);
    return C_OK;
}

/* This function will load the configured users appended to the server
 * configuration via ACLAppendUserForLoading(). On loading errors it will