{"id":228975,"date":"2020-12-09T07:30:43","date_gmt":"2020-12-08T23:30:43","guid":{"rendered":"http:\/\/4563.org\/?p=228975"},"modified":"2020-12-09T07:30:43","modified_gmt":"2020-12-08T23:30:43","slug":"%e8%ae%b0%e4%b8%80%e6%ac%a1-android-%e5%85%b3%e4%ba%8e-unix-abstract-socket-%e7%9a%84%e8%bf%9e%e6%8e%a5%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=228975","title":{"rendered":"\u8bb0\u4e00\u6b21 Android \u5173\u4e8e Unix abstract socket \u7684\u8fde\u63a5\u95ee\u9898"},"content":{"rendered":"<div>\n<div>\n<div>\n<h1>                  \u8bb0\u4e00\u6b21 Android \u5173\u4e8e Unix abstract socket \u7684\u8fde\u63a5\u95ee\u9898               <\/h1>\n<p> <\/p>\n<div>\n<div> <span>\u8cc7\u6df1\u5927\u4f6c : howellz <\/span>  <span><i><\/i> 6<\/span> <\/div>\n<div> <\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div isfirst=\"1\"> <\/p>\n<h2>Keywords<\/h2>\n<p>Android Unix abstract namespace socket LocalSocket LocalServerSocket length \u5730\u5740\u957f\u5ea6<\/p>\n<h2>\u6b63\u6587<\/h2>\n<p>\u5728\u4e00\u4e2a\u9879\u76ee\u4e2d\uff0c\u9700\u8981 native \u7684\u7a0b\u5e8f\u5bf9 java \u7684<code>LocalServerSocket<\/code>\u53d1\u8d77\u8fde\u63a5\u3002\u5373 Java \u7aef\u76d1\u542c\u67d0\u4e2a Unix \u5957\u63a5\u5b57\uff0c\u7b49\u5f85 native \u7684\u7a0b\u5e8f\u8fde\u63a5\u3002\u7ed3\u679c\u6b7b\u6d3b\u8fde\u4e0d\u4e0a\uff0c\u603b\u662f\u63d0\u793a<code>Connection Refused(110)<\/code>\u3002<\/p>\n<p>\u8fd9\u662f Java \u7aef\u7684\u4ee3\u7801\u793a\u610f\uff0c\u975e\u5e38\u7b80\u5355\uff1a<\/p>\n<pre><code>public void listen() {     String name = \"myname\";     mSocket = new LocalServerSocket(name);     LocalSocket client = mSocket.accept();     ... } <\/code><\/pre>\n<p>\u53d1\u73b0\u5ba2\u6237\u7aef\u5982\u679c\u7528 java \u4ee3\u7801\u8fde\u63a5\u5f88\u5bb9\u6613\u5c31\u8fde\u63a5\u4e0a\u4e86\uff1a<\/p>\n<pre><code>public void connect() {     String name = \"myname\";     LocalSocket client = new LocalSocket();     client.connect(new LocalSocketAddress(name));     Log.d(\"client\", \"connected to \" + name); } <\/code><\/pre>\n<p>\u4f46\u662f\u5ba2\u6237\u7aef\u5982\u679c\u4f7f\u7528\u5982\u4e0b\u7684 c \u4ee3\u7801\u5c31\u8fde\u63a5\u4e0d\u4e0a\uff1a<\/p>\n<pre><code>#define SOKET_NAME \"@myname\" void connect() {     char* name = SOKET_NAME;     struct sockaddr_un addr;     int sock = socket(AF_UNIX, SOCK_STREAM, 0);     if (sock &lt; 0) {         perror(\"failed to create socket\");         return -1;     }      memset(&amp;addr, 0, sizeof(addr));     addr.sun_family = AF_UNIX;     strncpy(addr.sun_path, SOKET_NAME, sizeof(addr.sun_path)-1);     if (name[0] == '@')         addr.sun_path[0] = '\u0000';       if (connect(sock, (struct sockaddr *)&amp;addr, sizeof(addr)) &lt; 0) {         perror(\"failed to connect\");         close(sock);         return -1;     }     ... } <\/code><\/pre>\n<p>\u8fd9\u6bb5\u4ee3\u7801\u4e3b\u8981\u53c2\u8003\u6743\u5a01 man UNIX(7): https:\/\/man7.org\/linux\/man-pages\/man7\/unix.7.html<\/p>\n<p>\u6ce8\u610f\uff0c\u8fd9\u4e2a SOCKET_NAME \u4e2d\u7684\u7b2c\u4e00\u4e2a\u5b57\u7b26 @\u662f\u4e00\u4e2a\u5360\u4f4d\u7b26\uff0c\u5176\u5b9e\u540e\u9762\u88ab&#8217;\u0000&#8217;\u53d6\u4ee3\u4e86\uff0c\u7b26\u5408<code>abstract unix socket<\/code>\u7684\u5730\u5740\u8981\u6c42\u3002<\/p>\n<p>\u4e00\u76f4\u8f93\u51fa\uff1a<\/p>\n<pre><code>failed to connect: Connection refused <\/code><\/pre>\n<p>\u540c\u6837\u7684\u4ee3\u7801\u5728\u666e\u901a\u7684 Linux \u7cfb\u7edf\u4e0a\u5c31\u53ef\u4ee5\u6b63\u5e38\u5de5\u4f5c\uff0c\u767e\u601d\u4e0d\u5f97\u5176\u59d0\u59d0\u3002\u6700\u540e\u67e5\u770b<code>LocalSocket<\/code>\u7684\u5b9e\u73b0\u4ee3\u7801\uff0c\u53d1\u73b0\u5728 Android \u7684<code>LocalSocket<\/code>\u5b9e\u73b0\u4e2d\uff0c\u4f7f\u7528\u4e86\u5982\u4e0b\u7684\u4ee3\u7801\u6765\u786e\u5b9a address \u7684\u957f\u5ea6\uff1a<\/p>\n<pre><code>*alen = namelen + offsetof(struct sockaddr_un, sun_path) + 1; <\/code><\/pre>\n<p>\u8fd9\u6837\u770b\u6765\uff0c** \u76f4\u63a5\u4f20\u9012<code>sizeof(struct sockaddr_un)<\/code>\u4f5c\u4e3a\u5730\u5740\u957f\u5ea6\u662f\u4e0d\u5408\u9002\u7684\uff0c\u5e94\u8be5\u4f20\u9012\u7684\u957f\u5ea6\u4e0d\u5305\u62ec\u7ed3\u6784\u4f53\u4e2d sun_path[]\u6570\u7ec4\u540e\u7684\u5168\u96f6 padding \u3002**<\/p>\n<p>\u4fee\u6539\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre><code>#define SOKET_NAME \"@myname\" void connect() {     char* name = SOKET_NAME;     struct sockaddr_un addr;      \/\/ add this variant     int alen;      int sock = socket(AF_UNIX, SOCK_STREAM, 0);     if (sock &lt; 0) {         perror(\"failed to create socket\");         return -1;     }      memset(&amp;addr, 0, sizeof(addr));     addr.sun_family = AF_UNIX;     strncpy(addr.sun_path, SOKET_NAME, sizeof(addr.sun_path)-1);     if (name[0] == '@')          addr.sun_path[0] = '\u0000';      \/\/ Added this line      alen = offsetof(struct sockaddr_un, sun_path) + strlen(name);       \/\/ change sizeof(addr) to alen     if (connect(sock, (struct sockaddr *)&amp;addr, alen) &lt; 0) {         perror(\"failed to connect\");         close(sock);         return -1;     } } <\/code><\/pre>\n<p>\u518d\u6b21\u8fd0\u884c\uff0c\u53ef\u4ee5\u8fde\u63a5\u4e0a\u4e86\u3002<\/p>\n<p>\u5bf9\u4e8e Android \u7684\u5b9e\u73b0\uff0c\u53ef\u4ee5\u53c2\u8003\u5982\u4e0b\u4ee3\u7801\uff1a https:\/\/android-opengrok.bangnimang.net\/android-9.0.0_r61\/xref\/system\/core\/libcutils\/socket_local_client_unix.cpp?r=db87e6d1#111<\/p>\n<\/p><\/div>\n<div> <b>\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (<span>1<\/span>)        <\/div>\n<div> <\/div>\n<\/p><\/div>\n<\/p><\/div>\n<ul>\n<li data-pid=\"4693756\" data-uid=\"2\">\n<div>\n<div>\n<div> <span>\u8cc7\u6df1\u5927\u4f6c : tkl <\/span>  <\/div>\n<div> <i title=\"\u5f15\u7528\"><\/i>  <span>          <\/span> <\/div>\n<\/p><\/div>\n<div>                                                             \u5206\u6790\u7684\u53ef\u4ee5<br \/>\u53e6 \u767e\u601d\u4e0d\u5f97\u5176\u59d0\u59d0\uff1f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n<li>\n","protected":false},"excerpt":{"rendered":"<p>\u8bb0\u4e00\u6b21 Android \u5173\u4e8e Un&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/228975"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=228975"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/228975\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=228975"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=228975"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=228975"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}