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。
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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%>
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 instance function 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 }) end end
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 --help Usage: iwinfoinfo iwinfo scan iwinfo txpowerlist iwinfo freqlist iwinfo assoclist iwinfo countrylist root@OpenWrt:~# iwinfo radio0 scan Cell 01 - Address: 00:00:00:00:00:00 ESSID: unknown Mode: Unknown Channel: unknown Signal: -256 dBm Quality: 0/0 Encryption: none Cell 02 - Address: 00:00:00:00:00:00 ESSID: unknown Mode: Unknown Channel: unknown Signal: -256 dBm Quality: 0/0 Encryption: none Cell 03 - Address: 00:00:00:00:00:00 ESSID: unknown Mode: Unknown Channel: unknown Signal: -256 dBm Quality: 0/0 Encryption: none Cell 04 - Address: 00:00:00:00:00:00 ESSID: unknown Mode: Unknown Channel: unknown Signal: -256 dBm Quality: 0/0 Encryption: none Cell 05 - Address: 00:00:00:00:00:00 ESSID: unknown Mode: Unknown Channel: unknown Signal: -256 dBm Quality: 0/0 Encryption: none Cell 06 - Address: 00:00:00:00:00:00 ESSID: unknown Mode: Unknown Channel: unknown Signal: -256 dBm Quality: 0/0 Encryption: none Cell 07 - Address: 00:00:00:00:00:00 ESSID: unknown Mode: Unknown Channel: unknown Signal: -256 dBm Quality: 0/0 Encryption: none Cell 08 - Address: 00:00:00:00:00:00 ESSID: unknown Mode: Unknown Channel: unknown Signal: -256 dBm Quality: 0/0 Encryption: none Cell 09 - Address: 00:00:00:00:00:00 ESSID: unknown Mode: Unknown Channel: unknown Signal: -256 dBm Quality: 0/0 Encryption: none Cell 10 - Address: 00:00:00:00:00:00 ESSID: unknown Mode: Unknown Channel: unknown Signal: -256 dBm Quality: 0/0 Encryption: none Cell 11 - Address: 00:00:00:00:00:00 ESSID: unknown Mode: Unknown Channel: unknown Signal: -256 dBm Quality: 0/0 Encryption: none Cell 12 - Address: 00:00:00:00:00:00 ESSID: unknown Mode: Unknown Channel: unknown Signal: -256 dBm Quality: 0/0 Encryption: none Cell 13 - Address: 00:00:00:00:00:00 ESSID: unknown Mode: Unknown Channel: unknown Signal: -256 dBm Quality: 0/0 Encryption: none Cell 14 - Address: 00:00:00:00:00:00 ESSID: unknown Mode: Unknown Channel: unknown Signal: -256 dBm Quality: 0/0 Encryption: none Cell 15 - Address: 00:00:00:00:00:00 ESSID: unknown Mode: Unknown Channel: unknown Signal: -256 dBm Quality: 0/0 Encryption: none Cell 16 - Address: 00:00:00:00:00:00 ESSID: unknown Mode: Unknown Channel: unknown Signal: -256 dBm Quality: 0/0 Encryption: none Cell 17 - Address: 00:00:00:00:00:00 ESSID: unknown Mode: Unknown Channel: unknown Signal: -256 dBm Quality: 0/0 Encryption: none Cell 18 - Address: 00:00:00:00:00:00 ESSID: unknown Mode: Unknown Channel: unknown Signal: -256 dBm Quality: 0/0 Encryption: none Cell 19 - Address: 00:00:00:00:00:00 ESSID: unknown Mode: Unknown Channel: unknown Signal: -256 dBm Quality: 0/0 Encryption: none Cell 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,$(IWINFO_BACKENDS)),) IWINFO_CFLAGS += -DUSE_WL IWINFO_LIB_OBJ += iwinfo_wl.o endif ifneq ($(filter madwifi,$(IWINFO_BACKENDS)),) IWINFO_CFLAGS += -DUSE_MADWIFI IWINFO_LIB_OBJ += iwinfo_madwifi.o endif ifneq ($(filter nl80211,$(IWINFO_BACKENDS)),) IWINFO_CFLAGS += -DUSE_NL80211 IWINFO_CLI_LDFLAGS += -lnl-tiny IWINFO_LIB_LDFLAGS += -lnl-tiny IWINFO_LIB_OBJ += iwinfo_nl80211.o endif
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)。
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