diff options
Diffstat (limited to 'crypto/heimdal/appl/popper/pop_dropcopy.c')
| -rw-r--r-- | crypto/heimdal/appl/popper/pop_dropcopy.c | 174 |
1 files changed, 0 insertions, 174 deletions
diff --git a/crypto/heimdal/appl/popper/pop_dropcopy.c b/crypto/heimdal/appl/popper/pop_dropcopy.c deleted file mode 100644 index 99ea49d..0000000 --- a/crypto/heimdal/appl/popper/pop_dropcopy.c +++ /dev/null @@ -1,174 +0,0 @@ -/* - * Copyright (c) 1989 Regents of the University of California. - * All rights reserved. The Berkeley software License Agreement - * specifies the terms and conditions for redistribution. - */ - -#include <popper.h> -RCSID("$Id: pop_dropcopy.c,v 1.26 2002/07/04 14:10:11 joda Exp $"); - -/* - * Run as the user in `pwd' - */ - -int -changeuser(POP *p, struct passwd *pwd) -{ - if(setgid(pwd->pw_gid) < 0) { - pop_log (p, POP_PRIORITY, - "Unable to change to gid %u: %s", - (unsigned)pwd->pw_gid, - strerror(errno)); - return pop_msg (p, POP_FAILURE, - "Unable to change gid"); - } - if(setuid(pwd->pw_uid) < 0) { - pop_log (p, POP_PRIORITY, - "Unable to change to uid %u: %s", - (unsigned)pwd->pw_uid, - strerror(errno)); - return pop_msg (p, POP_FAILURE, - "Unable to change uid"); - } -#ifdef DEBUG - if(p->debug) - pop_log(p, POP_DEBUG,"uid = %u, gid = %u", - (unsigned)getuid(), - (unsigned)getgid()); -#endif /* DEBUG */ - return POP_SUCCESS; -} - -/* - * dropcopy: Make a temporary copy of the user's mail drop and - * save a stream pointer for it. - */ - -int -pop_dropcopy(POP *p, struct passwd *pwp) -{ - int mfd; /* File descriptor for - the user's maildrop */ - int dfd; /* File descriptor for - the SERVER maildrop */ - FILE *tf; /* The temp file */ - char template[POP_TMPSIZE]; /* Temp name holder */ - char buffer[BUFSIZ]; /* Read buffer */ - long offset; /* Old/New boundary */ - int nchar; /* Bytes written/read */ - int tf_fd; /* fd for temp file */ - int ret; - - /* Create a temporary maildrop into which to copy the updated maildrop */ - snprintf(p->temp_drop, sizeof(p->temp_drop), POP_DROP,p->user); - -#ifdef DEBUG - if(p->debug) - pop_log(p,POP_DEBUG,"Creating temporary maildrop '%s'", - p->temp_drop); -#endif /* DEBUG */ - - /* Here we work to make sure the user doesn't cause us to remove or - * write over existing files by limiting how much work we do while - * running as root. - */ - - strlcpy(template, POP_TMPDROP, sizeof(template)); - if ((tf_fd = mkstemp(template)) < 0 || - (tf = fdopen(tf_fd, "w+")) == NULL) { - pop_log(p,POP_PRIORITY, - "Unable to create temporary temporary maildrop '%s': %s",template, - strerror(errno)); - return pop_msg(p,POP_FAILURE, - "System error, can't create temporary file."); - } - - /* Now give this file to the user */ - chown(template, pwp->pw_uid, pwp->pw_gid); - chmod(template, 0600); - - /* Now link this file to the temporary maildrop. If this fails it - * is probably because the temporary maildrop already exists. If so, - * this is ok. We can just go on our way, because by the time we try - * to write into the file we will be running as the user. - */ - link(template,p->temp_drop); - fclose(tf); - unlink(template); - - ret = changeuser(p, pwp); - if (ret != POP_SUCCESS) - return ret; - - /* Open for append, this solves the crash recovery problem */ - if ((dfd = open(p->temp_drop,O_RDWR|O_APPEND|O_CREAT,0600)) == -1){ - pop_log(p,POP_PRIORITY, - "Unable to open temporary maildrop '%s': %s",p->temp_drop, - strerror(errno)); - return pop_msg(p,POP_FAILURE, - "System error, can't open temporary file, do you own it?"); - } - - /* Lock the temporary maildrop */ - if ( flock (dfd, (LOCK_EX | LOCK_NB)) == -1 ) - switch(errno) { - case EWOULDBLOCK: - return pop_msg(p,POP_FAILURE, - "%sMaildrop lock busy! Is another session active?", - (p->flags & POP_FLAG_CAPA) ? "[IN-USE] " : ""); - /* NOTREACHED */ - default: - return pop_msg(p,POP_FAILURE,"flock: '%s': %s", p->temp_drop, - strerror(errno)); - /* NOTREACHED */ - } - - /* May have grown or shrunk between open and lock! */ - offset = lseek(dfd,0, SEEK_END); - - /* Open the user's maildrop, If this fails, no harm in assuming empty */ - if ((mfd = open(p->drop_name,O_RDWR)) > 0) { - - /* Lock the maildrop */ - if (flock (mfd, LOCK_EX) == -1) { - close(mfd) ; - return pop_msg(p,POP_FAILURE, "flock: '%s': %s", p->temp_drop, - strerror(errno)); - } - - /* Copy the actual mail drop into the temporary mail drop */ - while ( (nchar=read(mfd,buffer,BUFSIZ)) > 0 ) - if ( nchar != write(dfd,buffer,nchar) ) { - nchar = -1 ; - break ; - } - - if ( nchar != 0 ) { - /* Error adding new mail. Truncate to original size, - and leave the maildrop as is. The user will not - see the new mail until the error goes away. - Should let them process the current backlog, in case - the error is a quota problem requiring deletions! */ - ftruncate(dfd,(int)offset) ; - } else { - /* Mail transferred! Zero the mail drop NOW, that we - do not have to do gymnastics to figure out what's new - and what is old later */ - ftruncate(mfd,0) ; - } - - /* Close the actual mail drop */ - close (mfd); - } - - /* Acquire a stream pointer for the temporary maildrop */ - if ( (p->drop = fdopen(dfd,"a+")) == NULL ) { - close(dfd) ; - return pop_msg(p,POP_FAILURE,"Cannot assign stream for %s", - p->temp_drop); - } - - rewind (p->drop); - - return(POP_SUCCESS); -} |
