[英]Can't connect a Unix domain socket using Python: No such file or directory
I have several pieces of codes to establish a Unix domain socket and a service using this socket. 我有几段代码来建立Unix域套接字和使用此套接字的服务。 While there are some confusing errors here leading to a failure.
虽然这里有一些令人困惑的错误导致失败。
the code that creats the Unix domain socket is written in c: 创建Unix域套接字的代码用c编写:
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/un.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <errno.h>
int main(int ac, char *av[])
{
if (ac != 4) {
printf("Usage: %s dummy-fd sockpath binary\n", av[0]);
exit(-1);
}
char *sockpn = av[2];
char *bin = av[3];
int srvfd = socket(AF_UNIX, SOCK_STREAM, 0);
if (srvfd < 0) {
perror("socket");
exit(-1);
}
fcntl(srvfd, F_SETFD, FD_CLOEXEC);
struct stat st;
if (stat(sockpn, &st) >= 0) {
if (!S_ISSOCK(st.st_mode)) {
fprintf(stderr, "socket pathname %s exists and is not a socket\n",
sockpn);
exit(-1);
}
unlink(sockpn);
}
struct sockaddr_un addr;
addr.sun_family = AF_UNIX;
snprintf(&addr.sun_path[0], sizeof(addr.sun_path), "%s", sockpn);
if (bind(srvfd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
fprintf(stderr, "WARNING: cannot bind to socket %s (%s), exiting\n",
sockpn, strerror(errno));
exit(-1);
}
// allow anyone to connect; for access control, use directory permissions
chmod(sockpn, 0777);
listen(srvfd, 5);
signal(SIGCHLD, SIG_IGN);
signal(SIGPIPE, SIG_IGN);
for (;;) {
struct sockaddr_un client_addr;
unsigned int addrlen = sizeof(client_addr);
int cfd = accept(srvfd, (struct sockaddr *) &client_addr, &addrlen);
if (cfd < 0) {
perror("accept");
continue;
}
int pid = fork();
if (pid < 0) {
perror("fork");
close(cfd);
continue;
}
if (pid == 0) {
// Child process
dup2(cfd, 0);
dup2(cfd, 1);
close(cfd);
execl(bin, bin, 0);
perror("execl");
exit(-1);
}
close(cfd);
}
}
the client Python to using this sock is as follow(unixclient.py): 使用此袜子的客户端Python如下(unixclient.py):
def call(pn, req):
sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
sock.connect(pn)
sock.send(req)
sock.shutdown(socket.SHUT_DOWN)
data = ""
while True:
buf = sock.recv(1024)
if not buf:
break
data += buf
sock.close()
return data
And I trigger this piece of client code in another Python code, by importing this file and call the call
funciton: (Both "/jail/zoobar/echosvc" and "/jail/zoobar/echosvc/sock" will fail) 我触发此片的客户端代码中的另一个Python代码,通过导入此文件并调用
call
功能可按:(无论“/监狱/ zoobar / echosvc”和“/监狱/ zoobar / echosvc /袜子”将失败)
resp = call("/jail/zoobar/echosvc", str1)
There the error occurs, showing that: 出现错误,表明:
FIle "zoobar/unixclient.py", line 8, in call
sock.connect(pn)
File "<string>", line 1, in connect
error: [ERROR 2] No such file or directory
Yet I swear the directory and the socket does exist(/jail/zoobar/echosvc/sock), and the permission is correct, too(777), so I can't understand this weird error. 但是我发誓目录并且套接字确实存在(/ jail / zoobar / echosvc / sock),并且权限也是正确的(777),所以我无法理解这个奇怪的错误。 Does anyone know about it?
有人知道吗?
I would appreciate very much for sparing time to help. 我非常感谢您抽出宝贵的时间来提供帮助。
Looks like you're trying to open the wrong filename. 似乎您正在尝试打开错误的文件名。 The code looks like:
代码如下:
resp = call("/jail/zoobar/echosvc", str1)
But you say "the file exists": 但是您说“文件存在”:
/jail/zoobar/echosvc/sock
Try changing your call line to: 尝试将电话线路更改为:
resp = call("/jail/zoobar/echosvc/sock", str1)
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