Fixed spurious failure with Interrupted system call; Fixed race when fd closed at...

[userv.git] / process.c

diff --git a/process.c b/process.c
index 98bbeec6523bd73ffc966057b2f3e296e1a5dab8..3ca468cea0414cffc31e94c7cc7299a6c5db6bb5 100644 (file)
--- a/process.c
+++ b/process.c
@@ -2,7 +2,7 @@
  * userv - process.c
  * daemon code to process one request (is parent of service process)
  *
- * Copyright (C)1996-1997 Ian Jackson
+ * Copyright (C)1996-1999 Ian Jackson
  *
  * This is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by
@@ -60,6 +60,7 @@
 
 #include "config.h"
 #include "common.h"
+#include "both.h"
 #include "daemon.h"
 #include "lib.h"
 #include "tokens.h"
@@ -126,7 +127,7 @@ static void xfwriteerror(void) {
   if (errno != EPIPE) syscallerror("writing to client");
   blocksignals();
   ensurelogopen(USERVD_LOGFACILITY);
-  syslog(LOG_DEBUG,"client went away (broken pipe)");
+  syslog(LOG_INFO,"client went away (broken pipe)");
   disconnect(8);
 }
 
@@ -147,11 +148,11 @@ static void xfflush(FILE *file) {
 
 static void xfread(void *p, size_t sz) {
   size_t nr;
-  nr= fread(p,1,sz,srfile); if (nr == sz) return;
+  nr= working_fread(p,sz,srfile); if (nr == sz) return;
   if (ferror(srfile)) syscallerror("reading from client");
   blocksignals();
   assert(feof(srfile));
-  syslog(LOG_DEBUG,"client went away (unexpected EOF)");
+  syslog(LOG_INFO,"client went away (unexpected EOF)");
   swfile= 0;
   disconnect(8);
 }
@@ -183,7 +184,7 @@ static void getevent(struct event_msg *event_r) {
        blocksignals();
        syslog(LOG_ERR,"client sent bad file descriptor %d to close (max %d)",
               fd,fdarrayused-1);
-       disconnect(12);
+       disconnect(20);
       }
       if (fdarray[fd].holdfd!=-1) {
        if (close(fdarray[fd].holdfd)) syscallerror("cannot close holding fd");
@@ -192,7 +193,7 @@ static void getevent(struct event_msg *event_r) {
       break;
     case et_disconnect:
       blocksignals();
-      syslog(LOG_DEBUG,"client disconnected");
+      syslog(LOG_INFO,"client disconnected");
       disconnect(4);
     default:
       return;
@@ -218,7 +219,7 @@ void syscallerror(const char *what) {
   e= errno;
   blocksignals();
   syslog(LOG_ERR,"system call failure: %s: %s",what,strerror(e));
-  disconnect(18);
+  disconnect(16);
 }
 
 /* Functions which may be called from signal handlers.  These
@@ -287,7 +288,7 @@ static void NONRETURNING sighandler_chld(int ignored) {
   xfwrite(&progress_mbuf,sizeof(progress_mbuf),swfile);
   xfflush(swfile);
 
-  syslog(LOG_DEBUG,"service completed (status %d %d)",(status>>8)&0x0ff,status&0x0ff);
+  syslog(LOG_INFO,"service completed (status %d %d)",(status>>8)&0x0ff,status&0x0ff);
   _exit(0);
 }
 
@@ -327,7 +328,7 @@ static void NONRETURNING generalfailure(const char *prefix, int reserveerrno,
     strnytcat(errmsg,strerror(errnoval),sizeof(errmsg));
   }
   senderrmsgstderr(errmsg);
-  syslog(LOG_DEBUG,"service failed (%s)",errmsg);
+  syslog(LOG_INFO,"service failed (%s)",errmsg);
   disconnect(12);
 }
 
@@ -412,6 +413,7 @@ static void receive_request(void) {
   xfread(&request_mbuf,sizeof(request_mbuf));
   serviceuser= xfreadsetstring(request_mbuf.serviceuserlen);
   service= xfreadsetstring(request_mbuf.servicelen);
+  assert(request_mbuf.spoofed==0 || request_mbuf.spoofed==1);
   logname= xfreadsetstring(request_mbuf.lognamelen);
   cwd= xfreadsetstring(request_mbuf.cwdlen);
   if (request_mbuf.overridelen >= 0) {
@@ -506,12 +508,15 @@ static void lookup_uidsgids(void) {
   serviceuser_shell= xstrsave(pw->pw_shell);
   serviceuser_uid= pw->pw_uid;
   
+  if (setregid(pw->pw_gid,pw->pw_gid)) syscallerror("setregid 1");
   if (initgroups(pw->pw_name,pw->pw_gid)) syscallerror("initgroups");
   if (setreuid(pw->pw_uid,pw->pw_uid)) syscallerror("setreuid 1");
   if (setreuid(pw->pw_uid,pw->pw_uid)) syscallerror("setreuid 2");
-  if (pw->pw_uid)
+  if (pw->pw_uid) {
     if (!setreuid(pw->pw_uid,0)) miscerror("setreuid 3 unexpectedly succeeded");
-  if (errno != EPERM) syscallerror("setreuid 3 failed in unexpected way");
+    if (errno != EPERM) syscallerror("setreuid 3 failed in unexpected way");
+  }
+  if (setregid(pw->pw_gid,pw->pw_gid)) syscallerror("setregid 2");
 
   service_ngids= getgroups(0,0); if (service_ngids == -1) syscallerror("getgroups(0,0)");
   if (service_ngids > MAX_GIDS) miscerror("service user is in far too many groups");
@@ -595,6 +600,7 @@ static void makenonexistentfd(int fd) {
     if (fdarray[fd].holdfd != -1) {
       if (close(fdarray[fd].holdfd))
        syscallfailure("close unwanted hold descriptor for %d",fd);
+      fdarray[fd].holdfd= -1;
     }
   }
 }
@@ -711,9 +717,13 @@ void servicerequest(int sfd) {
   setup_comms(sfd);
   send_opening();
   receive_request();
+  if (request_mbuf.clientpid == (pid_t)-1) _exit(2);
   establish_pipes();
   lookup_uidsgids();
   debug_dumprequest(mypid);
+  syslog(LOG_INFO,"%s %s -> %s %c %s",
+        request_mbuf.spoofed ? "spoof" : "user",
+        logname, serviceuser, overridedata?'!':':', service);
 
   if (overridedata)
     r= parse_string(TOPLEVEL_OVERRIDDEN_CONFIGURATION,