talk.c里，居然有一块

        if (buf[0] != 'A' && buf[0] != 'a' && buf[0] != 'B' && buf[0] != 'b'
            && buf[0] != 'C' && buf[0] != 'c' && buf[0] != 'D' && buf[0] != 'd'
            && buf[0] != 'e' && buf[0] != 'E' && buf[0] != 'f' && buf[0] != 'F'
            && buf[0] != 'g' && buf[0] != 'G' && buf[0] != 'n' && buf[0] != 'N'
            && buf[0] != 'm' && buf[0] != 'M')

疯了，这得判断多少次啊……通通改成 buf[0] == 'A' || buf[0] == 'a' 外面加个!了
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FROM 222.22.10.*