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怎么解决OpenWrt无线搜索错误bug

发表于:2025-01-29 作者:千家信息网编辑
千家信息网最后更新 2025年01月29日,本篇文章为大家展示了怎么解决OpenWrt无线搜索错误bug,内容简明扼要并且容易理解,绝对能使你眼前一亮,通过这篇文章的详细介绍希望你能有所收获。TP-LINK 841n路由更新openwrt系统到
千家信息网最后更新 2025年01月29日怎么解决OpenWrt无线搜索错误bug

本篇文章为大家展示了怎么解决OpenWrt无线搜索错误bug,内容简明扼要并且容易理解,绝对能使你眼前一亮,通过这篇文章的详细介绍希望你能有所收获。

TP-LINK 841n路由更新openwrt系统到Barrier Breaker r41988,"网络"-->"无线"-->"搜索"这个功能就不能用了,trunk版的也有这个问题。其实今年4、5月份玩HG255D路由就有这个问题,但当时的源码编译给TP-LINK 841n却没有这个问题。对这样的问题,确实比较头大,花了两天时间终于找到bug所在(只解决wr841n的,我的hg255d出问题了)。

无线搜索bug截图(注意device参数radio0):

一番搜索后发现此页面的源码在系统的/usr/lib/lua/luci/view/admin_network/wifi_join.htm文件里,对应openwrt的源码路径为./feeds/luci/modules/admin-full/luasrc/view/admin_network/wifi_join.htm。终于要代码如下:

<%-        local sys = require "luci.sys"        local utl = require "luci.util"        function guess_wifi_signal(info)                local scale = (100 / (info.quality_max or 100) * (info.quality or 0))                local icon                if not info.bssid or info.bssid == "00:00:00:00:00:00" then                        icon = resource .. "/icons/signal-none.png"                elseif scale < 15 then                        icon = resource .. "/icons/signal-0.png"                elseif scale < 35 then                        icon = resource .. "/icons/signal-0-25.png"                elseif scale < 55 then                        icon = resource .. "/icons/signal-25-50.png"                elseif scale < 75 then                        icon = resource .. "/icons/signal-50-75.png"                else                        icon = resource .. "/icons/signal-75-100.png"                end                return icon        end        function percent_wifi_signal(info)                local qc = info.quality or 0                local qm = info.quality_max or 0                if info.bssid and qc > 0 and qm > 0 then                        return math.floor((100 / qm) * qc)                else                        return 0                end        end        function format_wifi_encryption(info)                if info.wep == true then                        return "WEP"                elseif info.wpa > 0 then                        return translatef("%s - %s",                                table.concat(info.pair_ciphers, ", "),                                table.concat(info.group_ciphers, ", "),                                (info.wpa == 3) and translate("mixed WPA/WPA2")                                        or (info.wpa == 2 and "WPA2" or "WPA"),                                table.concat(info.auth_suites, ", ")                        )                elseif info.enabled then                        return "%s" % translate("unknown")                else                        return "%s" % translate("open")                end        end        local dev = luci.http.formvalue("device")        local iw = luci.sys.wifi.getiwinfo(dev)        if not iw then                luci.http.redirect(luci.dispatcher.build_url("admin/network/wireless"))                return        end        function scanlist(times)                local i, k, v                local l = { }                local s = { }                for i = 1, times do                        for k, v in ipairs(iw.scanlist or { }) do                                if not s[v.bssid] then                                        l[#l+1] = v                                        s[v.bssid] = true                                end                        end                end                return l        end-%><%+header%>

<%:Join Network: Wireless Scan%>

<% for i, net in ipairs(scanlist(3)) do net.encryption = net.encryption or { } %> <% end %>

<%=percent_wifi_signal(net)%>%
<%=net.ssid and utl.pcdata(net.ssid) or "%s" % translate("hidden")%>
Channel: <%=net.channel%> | Mode: <%=net.mode%> | BSSID: <%=net.bssid%> | Encryption: <%=format_wifi_encryption(net.encryption)%>
<% if net.encryption.wpa then %> <% for _, v in ipairs(net.encryption.auth_suites) do %> <% end; for _, v in ipairs(net.encryption.group_ciphers) do %> <% end; for _, v in ipairs(net.encryption.pair_ciphers) do %> <% end; end %> " />

进一步的测试发现,在调用function scanlist(times)异常导致生成的网页不完整,浏览器就会看到那段错误信息。而此函数又是在调用iw.scanlist发生异常。由local iw = luci.sys.wifi.getiwinfo(dev)找到sys.lua模块,路径/usr/lib/lua/luci/sys.lua,对应openwrt源码位置./feeds/luci/modules/base/luasrc/sys.lua。主要源码:

--- Get wireless information for given interface.-- @param ifname        String containing the interface name-- @return              A wrapped iwinfo object instancefunction wifi.getiwinfo(ifname)        local stat, iwinfo = pcall(require, "iwinfo")        if ifname then                local c = 0                local u = uci.cursor_state()                local d, n = ifname:match("^(%w+)%.network(%d+)")                if d and n then                        ifname = d                        n = tonumber(n)                        u:foreach("wireless", "wifi-iface",                                function(s)                                        if s.device == d then                                                c = c + 1                                                if c == n then                                                        ifname = s.ifname or s.device                                                        return false                                                end                                        end                                end)                elseif u:get("wireless", ifname) == "wifi-device" then                        u:foreach("wireless", "wifi-iface",                                function(s)                                        if s.device == ifname and s.ifname then                                                ifname = s.ifname                                                return false                                        end                                end)                end                local t = stat and iwinfo.type(ifname)                local x = t and iwinfo[t] or { }                return setmetatable({}, {                        __index = function(t, k)                                if k == "ifname" then                                        return ifname                                elseif x[k] then                                        return x[k](ifname)                                end                        end                })        endend

原来是调用iwinfo命令完成的无线搜索。在openwrt下运行iwinfo命令:

root@OpenWrt:~# iwinfo --helpUsage:        iwinfo  info        iwinfo  scan        iwinfo  txpowerlist        iwinfo  freqlist        iwinfo  assoclist        iwinfo  countrylistroot@OpenWrt:~# iwinfo radio0 scanCell 01 - Address: 00:00:00:00:00:00          ESSID: unknown          Mode: Unknown  Channel: unknown          Signal: -256 dBm  Quality: 0/0          Encryption: noneCell 02 - Address: 00:00:00:00:00:00          ESSID: unknown          Mode: Unknown  Channel: unknown          Signal: -256 dBm  Quality: 0/0          Encryption: noneCell 03 - Address: 00:00:00:00:00:00          ESSID: unknown          Mode: Unknown  Channel: unknown          Signal: -256 dBm  Quality: 0/0          Encryption: noneCell 04 - Address: 00:00:00:00:00:00          ESSID: unknown          Mode: Unknown  Channel: unknown          Signal: -256 dBm  Quality: 0/0          Encryption: noneCell 05 - Address: 00:00:00:00:00:00          ESSID: unknown          Mode: Unknown  Channel: unknown          Signal: -256 dBm  Quality: 0/0          Encryption: noneCell 06 - Address: 00:00:00:00:00:00          ESSID: unknown          Mode: Unknown  Channel: unknown          Signal: -256 dBm  Quality: 0/0          Encryption: noneCell 07 - Address: 00:00:00:00:00:00          ESSID: unknown          Mode: Unknown  Channel: unknown          Signal: -256 dBm  Quality: 0/0          Encryption: noneCell 08 - Address: 00:00:00:00:00:00          ESSID: unknown          Mode: Unknown  Channel: unknown          Signal: -256 dBm  Quality: 0/0          Encryption: noneCell 09 - Address: 00:00:00:00:00:00          ESSID: unknown          Mode: Unknown  Channel: unknown          Signal: -256 dBm  Quality: 0/0          Encryption: noneCell 10 - Address: 00:00:00:00:00:00          ESSID: unknown          Mode: Unknown  Channel: unknown          Signal: -256 dBm  Quality: 0/0          Encryption: noneCell 11 - Address: 00:00:00:00:00:00          ESSID: unknown          Mode: Unknown  Channel: unknown          Signal: -256 dBm  Quality: 0/0          Encryption: noneCell 12 - Address: 00:00:00:00:00:00          ESSID: unknown          Mode: Unknown  Channel: unknown          Signal: -256 dBm  Quality: 0/0          Encryption: noneCell 13 - Address: 00:00:00:00:00:00          ESSID: unknown          Mode: Unknown  Channel: unknown          Signal: -256 dBm  Quality: 0/0          Encryption: noneCell 14 - Address: 00:00:00:00:00:00          ESSID: unknown          Mode: Unknown  Channel: unknown          Signal: -256 dBm  Quality: 0/0          Encryption: noneCell 15 - Address: 00:00:00:00:00:00          ESSID: unknown          Mode: Unknown  Channel: unknown          Signal: -256 dBm  Quality: 0/0          Encryption: noneCell 16 - Address: 00:00:00:00:00:00          ESSID: unknown          Mode: Unknown  Channel: unknown          Signal: -256 dBm  Quality: 0/0          Encryption: noneCell 17 - Address: 00:00:00:00:00:00          ESSID: unknown          Mode: Unknown  Channel: unknown          Signal: -256 dBm  Quality: 0/0          Encryption: noneCell 18 - Address: 00:00:00:00:00:00          ESSID: unknown          Mode: Unknown  Channel: unknown          Signal: -256 dBm  Quality: 0/0          Encryption: noneCell 19 - Address: 00:00:00:00:00:00          ESSID: unknown          Mode: Unknown  Channel: unknown          Signal: -256 dBm  Quality: 0/0          Encryption: noneCell 20 - Address: 00:00:00:00:00:00          ESSID: unknown          Mode: Unknown  Channel: unknown          Signal: -256 dBm  Quality: 0/0          Encryption: none

看看Address、ESSID。。 说明iwinfo根本就无法扫描到无线接入点。而在4、5月份编译的版本运行此命令没问题,可以搜索到接入点。iwinfo涉及到两个文件,在openwrt系统下一个是可执行文件/usr/bin/iwinfo,另一个是动态链接库文件/usr/lib/libiwinfo.so。于是拷贝之前系统(可以用搜索功能)的iwinfo、libiwinfo.so文件到有问题的路由的/tmp目录下,shell切换到/tmp目录,执行export LD_LIBRARY_PATH=.

然后再执行./iwinfo radio0 scan,发现搜索无线接入点正常,看来出来就出在iwinfo、libiwinfo.so上。直接删除/tmp目录下的libiwinfo.so后再./iwinfo radio0 scan,问题又出现了。由此推断出问题应该在libiwinfo.so里。iwinfo工具源码在openwrt源码的./package/network/utils/iwinfo下,注意Makefile文件有如下代码:

IWINFO_BACKENDS := \        $(if $(CONFIG_PACKAGE_kmod-brcm-wl),wl) \        $(if $(CONFIG_PACKAGE_kmod-brcm-wl-mini),wl) \        $(if $(CONFIG_PACKAGE_kmod-brcm-wl-mimo),wl) \        $(if $(CONFIG_PACKAGE_kmod-madwifi),madwifi) \        $(if $(CONFIG_PACKAGE_kmod-mac80211),nl80211)

在src目录下的Makefile文件有如下代码:

ifneq ($(filter wl,$(IWINFO_BACKENDS)),)        IWINFO_CFLAGS  += -DUSE_WL        IWINFO_LIB_OBJ += iwinfo_wl.oendififneq ($(filter madwifi,$(IWINFO_BACKENDS)),)        IWINFO_CFLAGS  += -DUSE_MADWIFI        IWINFO_LIB_OBJ += iwinfo_madwifi.oendififneq ($(filter nl80211,$(IWINFO_BACKENDS)),)        IWINFO_CFLAGS      += -DUSE_NL80211        IWINFO_CLI_LDFLAGS += -lnl-tiny        IWINFO_LIB_LDFLAGS += -lnl-tiny        IWINFO_LIB_OBJ     += iwinfo_nl80211.oendif

无线搜索有3中实现,刚开始我也不知道841n下是用哪种,索性在makefile文件里写些调试输出语句。然后make package/network/utils/iwinfo/compile V=s重新编译iwinfo,发现用的是nl80211,也就是说要改的代码在./src/iwinfo_nl80211.c。经过一系列的调试最终发现bug所在。解决方案如下:

// iwinfo_cli.c文件static void print_scanlist(const struct iwinfo_ops *iw, const char *ifname){        int i, x, len=0; //这里len必须初始化为0        char buf[IWINFO_BUFSIZE];        struct iwinfo_scanlist_entry *e;        if (iw->scanlist(ifname, buf, &len))        {                printf("Scanning not possible\n\n");                return;        }        else if (len <= 0)        {                printf("No scan results\n\n");                return;        }
// iwinfo_nl80211.c文件nl80211_phy2ifname函数修改如下static char * nl80211_phy2ifname(const char *ifname){        int fd, ifidx = -1, cifidx = -1, phyidx = -1;        char buffer[64];        static char nif[IFNAMSIZ] = { 0 };//注意静态变量        DIR *d;        struct dirent *e;        char *ret = NULL; //添加        if (!ifname)                return NULL;        else if (!strncmp(ifname, "phy", 3))                phyidx = atoi(&ifname[3]);        else if (!strncmp(ifname, "radio", 5))                phyidx = atoi(&ifname[5]);        //当传进来的ifname=wlan0时,phyidx=-1,后面的memset可能会把ifname清空。        //memset(nif, 0, sizeof(nif)); //注释掉,因为ifname可能指向nif        if (phyidx > -1)        {                if ((d = opendir("/sys/class/net")) != NULL)                {                        while ((e = readdir(d)) != NULL)                        {                                snprintf(buffer, sizeof(buffer),                                         "/sys/class/net/%s/phy80211/index", e->d_name);                                if (nl80211_readint(buffer) == phyidx)                                {                                        snprintf(buffer, sizeof(buffer),                                                 "/sys/class/net/%s/ifindex", e->d_name);                                        if ((cifidx = nl80211_readint(buffer)) >= 0 &&                                            ((ifidx < 0) || (cifidx < ifidx)))                                        {                                                ifidx = cifidx;                                                strncpy(nif, e->d_name, sizeof(nif));                                                ret = nif ; //添加                                                break ; //添加                                        }                                }                        }                        closedir(d);                }        }        return ret ; //修改}

make package/network/utils/iwinfo/compile V=s 重新编译iwinfo,传到路由上测试,iwinfo radio0 scan已经没问题,可以正常搜索无线了。其实我不喜欢nl80211_phy2ifname函数用静态变量方式返回,而更倾向于用函数参数的方式,例如声明成static char * nl80211_phy2ifname(const char *ifname, char *out)。

上述内容就是怎么解决OpenWrt无线搜索错误bug,你们学到知识或技能了吗?如果还想学到更多技能或者丰富自己的知识储备,欢迎关注行业资讯频道。

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