Merge daemon.c into common.c

[apps/pfixtools.git] / common.c

diff --git a/common.c b/common.c
index 7ede07b..eba691b 100644 (file)
--- a/common.c
+++ b/common.c
@@ -33,6 +33,11 @@
  * Copyright © 2007 Pierre Habouzit
  */
 
+#include <fcntl.h>
+#include <grp.h>
+#include <pwd.h>
+#include <sys/un.h>
+
 #include "common.h"
 
 sig_atomic_t cleanexit = false;
@@ -65,6 +70,141 @@ void common_sighandler(int sig)
     }
 }
 
+static int setnonblock(int sock)
+{
+    int res = fcntl(sock, F_GETFL);
+
+    if (res < 0) {
+        UNIXERR("fcntl");
+        return -1;
+    }
+
+    if (fcntl(sock, F_SETFL, res | O_NONBLOCK) < 0) {
+        UNIXERR("fcntl");
+        return -1;
+    }
+
+    return 0;
+}
+
+int tcp_listen_nonblock(const struct sockaddr *addr, socklen_t len)
+{
+    int sock;
+
+    switch (addr->sa_family) {
+      case AF_UNIX:
+        unlink(((struct sockaddr_un *)addr)->sun_path);
+        sock = socket(PF_UNIX, SOCK_STREAM, 0);
+        break;
+      case AF_INET:
+        sock = socket(PF_INET, SOCK_STREAM, 0);
+        break;
+      case AF_INET6:
+        sock = socket(PF_INET6, SOCK_STREAM, 0);
+        break;
+      default:
+        errno = EINVAL;
+        return -1;
+    }
+
+    if (sock < 0) {
+        UNIXERR("socket");
+        return -1;
+    }
+
+    if (addr->sa_family != AF_UNIX) {
+        int v = 1;
+        if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v)) < 0) {
+            UNIXERR("setsockopt(SO_REUSEADDR)");
+            close(sock);
+            return -1;
+        }
+    }
+
+    if (bind(sock, addr, len) < 0) {
+        UNIXERR("bind");
+        close(sock);
+        return -1;
+    }
+
+    if (setnonblock(sock)) {
+        close(sock);
+        return -1;
+    }
+
+    if (listen(sock, 0) < 0) {
+        UNIXERR("bind");
+        close(sock);
+        return -1;
+    }
+
+    return sock;
+}
+
+int accept_nonblock(int fd)
+{
+    int sock = accept(fd, NULL, 0);
+
+    if (sock < 0) {
+        UNIXERR("accept");
+        return -1;
+    }
+
+    if (setnonblock(sock)) {
+        close(sock);
+        return -1;
+    }
+
+    return sock;
+}
+
+int daemon_detach(void)
+{
+    pid_t pid;
+
+    close(STDIN_FILENO);
+    close(STDOUT_FILENO);
+    close(STDERR_FILENO);
+
+    open("/dev/null", O_RDWR);
+    open("/dev/null", O_RDWR);
+    open("/dev/null", O_RDWR);
+
+    pid = fork();
+    if (pid < 0)
+        return -1;
+    if (pid)
+        exit(0);
+
+    setsid();
+    return 0;
+}
+
+int drop_privileges(const char *user, const char *group)
+{
+    if (!geteuid()) {
+        struct passwd *pw;
+        struct group *gr;
+
+        if (group) {
+            gr = getgrnam(group);
+            if (!gr)
+                return -1;
+            setgid(gr->gr_gid);
+        }
+
+        pw = getpwnam(user);
+        if (!pw)
+            return -1;
+        if (!group) {
+            setgid(pw->pw_gid);
+        }
+        setuid(pw->pw_uid);
+    }
+
+    return 0;
+}
+
 void common_initialize(void)
 {
     extern initcall_t __madinit_start, __madinit_end;