introduce throwable_exit for nicer stack unwinding

yes, I enjoy abusing features

Signed-off-by: Michael Krelin <hacker@klever.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/eyefiworker.cc b/src/eyefiworker.cc
index ac75fc1..1979b46 100644
--- a/src/eyefiworker.cc
+++ b/src/eyefiworker.cc
@@ -1,339 +1,341 @@
 #include <signal.h>
 #ifndef NDEBUG
 # include <sys/resource.h>
 #endif
 #include <syslog.h>
 #include <cassert>
 #include <iostream>
 #include <fstream>
 #include <stdexcept>
 #include <iterator>
 #include <algorithm>
 #include <sys/wait.h>
 #include <autosprintf.h>
 #include "eyekinfig.h"
 #include "eyetil.h"
 #include "eyefiworker.h"
 #ifdef HAVE_SQLITE
 # include "iiidb.h"
 #endif
 
 eyefiworker::eyefiworker()
     : eyefiService(SOAP_IO_STORE|SOAP_IO_KEEPALIVE) {
         bind_flags = SO_REUSEADDR; max_keep_alive = 0;
         socket_flags =
 #if defined(MSG_NOSIGNAL)
             MSG_NOSIGNAL
 #elif defined(SO_NOSIGPIPE)
             SO_NOSIGPIPE
 #else
 #error Something is wrong with sigpipe prevention on the platform
 #endif
             ;
     }
+eyefiworker::~eyefiworker() {
+}
 
 int eyefiworker::run(int bindport) {
 #ifdef HAVE_SQLITE
     sqlite3_initialize();
 #endif
     if(!soap_valid_socket(bind(0,bindport,64)))
         throw std::runtime_error("failed to bind()");
     signal(SIGCHLD,SIG_IGN);
     while(true) {
         if(!soap_valid_socket(accept()))
             throw std::runtime_error("failed to accept()");
         pid_t p = fork();
         if(p<0) throw std::runtime_error("failed to fork()");
         if(!p) {
             recv_timeout = 600; send_timeout = 120;
             (void)serve();
             soap_destroy(this); soap_end(this); soap_done(this);
 #ifndef NDEBUG
             struct rusage ru;
             if(getrusage(RUSAGE_SELF,&ru)) {
                 syslog(LOG_NOTICE,"Failed to getrusage(): %d",errno);
             }else{
                 syslog(LOG_INFO,"maxrss: %ld\n",ru.ru_maxrss);
             }
 #endif /* NDEBUG */
-            _exit(0);
+            throw throwable_exit(0);
         }
         close(socket); socket = SOAP_INVALID_SOCKET;
     }
 }
 
 static binary_t session_nonce;
 #ifdef HAVE_SQLITE
     static struct {
         std::string filesignature;
         long filesize;
         std::string filename;
         inline void reset() { filesignature.erase(); filename.erase(); filesize=0; }
         inline void set(const std::string n,const std::string sig,long siz) {
             filename = n; filesignature = sig; filesize = siz;
         }
         inline bool is(const std::string n,const std::string sig,long siz) {
             return filesize==siz && filename==n && filesignature==sig;
         }
     }   already;
 #endif /* HAVE_SQLITE */
 
 static bool detached_child() {
     pid_t p = fork();
     if(p<0) {
         syslog(LOG_ERR,"Failed to fork away for hook execution");
         _exit(-1);
     }
     if(!p) {
         setsid();
         for(int i=getdtablesize();i>=0;--i) close(i);
         int i=open("/dev/null",O_RDWR); assert(i==0);
         i = dup(i); assert(i==1);
         i = dup(i); assert(i==2);
         return true;
     }
     return false;
 }
 
 static int E(eyefiworker* efs,const char *c,const std::exception& e) {
     efs->keep_alive=0;
     syslog(LOG_ERR,"error while processing %s: %s",c,e.what());
     return soap_sender_fault(efs,gnu::autosprintf("error processing %s",c),0);
 }
 
 int eyefiworker::StartSession(
         std::string macaddress,std::string cnonce,
         int transfermode,long transfermodetimestamp,
         struct rns__StartSessionResponse &r ) try {
     syslog(LOG_INFO,
             "StartSession request from %s with cnonce=%s, transfermode=%d, transfermodetimestamp=%ld",
             macaddress.c_str(), cnonce.c_str(), transfermode, transfermodetimestamp );
     eyekinfig_t eyekinfig(macaddress);
     r.credential = binary_t(macaddress+cnonce+eyekinfig.get_upload_key()).md5().hex();
 
     r.snonce = session_nonce.make_nonce().hex();
     r.transfermode=transfermode;
     r.transfermodetimestamp=transfermodetimestamp;
     r.upsyncallowed=false;
 
     std::string cmd = eyekinfig.get_on_start_session();
     if(!cmd.empty()) {
         if(detached_child()) {
             putenv( gnu::autosprintf("EYEFI_MACADDRESS=%s",macaddress.c_str()) );
             putenv( gnu::autosprintf("EYEFI_TRANSFERMODE=%d",transfermode) );
             putenv( gnu::autosprintf("EYEFI_TRANSFERMODETIMESTAMP=%ld",transfermodetimestamp) );
             char *argv[] = { (char*)"/bin/sh", (char*)"-c", (char*)cmd.c_str(), 0 };
             execv("/bin/sh",argv);
             syslog(LOG_ERR,"Failed to execute '%s'",cmd.c_str());
             _exit(-1);
         }
     }
     return SOAP_OK;
 }catch(const std::exception& e) { return E(this,"StartSession",e); }
 
 int eyefiworker::GetPhotoStatus(
         std::string credential, std::string macaddress,
         std::string filename, long filesize, std::string filesignature,
         int flags,
         struct rns__GetPhotoStatusResponse &r ) try {
     syslog(LOG_INFO,
             "GetPhotoStatus request from %s with credential=%s, filename=%s, filesize=%ld, filesignature=%s, flags=%d; session nonce=%s",
             macaddress.c_str(), credential.c_str(), filename.c_str(), filesize, filesignature.c_str(), flags,
             session_nonce.hex().c_str() );
 
     eyekinfig_t eyekinfig(macaddress);
     std::string computed_credential = binary_t(macaddress+eyekinfig.get_upload_key()+session_nonce.hex()).md5().hex();
 
 #ifndef NDEBUG
     syslog(LOG_DEBUG, " computed credential=%s", computed_credential.c_str());
 #endif
 
     if (credential != computed_credential) throw std::runtime_error("card authentication failed");
 
 #ifdef HAVE_SQLITE
     iiidb_t D(eyekinfig);
     seclude::stmt_t S = D.prepare(
             "SELECT fileid FROM photo"
             " WHERE mac=:mac AND filename=:filename"
             "  AND filesize=:filesize AND filesignature=:filesignature"
     ).bind(":mac",macaddress)
      .bind(":filename",filename).bind(":filesize",filesize)
      .bind(":filesignature",filesignature);
     if(!S.step()) {
         r.fileid = 1; r.offset = 0;
     }else{
         r.fileid = S.column<long>(0);
         r.offset = filesize;
         already.set(filename,filesignature,filesize);
     }
 #else /* HAVE_SQLITE */
     r.fileid=1, r.offset=0;
 #endif /* HAVE_SQLITE */
     return SOAP_OK;
 }catch(const std::exception& e) { return E(this,"GetPhotoStatus",e); }
 
 int eyefiworker::MarkLastPhotoInRoll(
         std::string macaddress, int mergedelta,
         struct rns__MarkLastPhotoInRollResponse&/* r */ ) try {
     syslog(LOG_INFO,
             "MarkLastPhotoInRoll request from %s with mergedelta=%d",
             macaddress.c_str(), mergedelta );
     std::string cmd = eyekinfig_t(macaddress).get_on_mark_last_photo_in_roll();
     if(!cmd.empty()) {
         if(detached_child()) {
             putenv( gnu::autosprintf("EYEFI_MACADDRESS=%s",macaddress.c_str()) );
             putenv( gnu::autosprintf("EYEFI_MERGEDELTA=%d",mergedelta) );
             char *argv[] = { (char*)"/bin/sh", (char*)"-c", (char*)cmd.c_str(), 0 };
             execv("/bin/sh",argv);
             syslog(LOG_ERR,"Failed to execute '%s'",cmd.c_str());
             _exit(-1);
         }
     }
     keep_alive = 0;
     return SOAP_OK;
 }catch(const std::exception& e) { return E(this,"MarkLastPhotoInRoll",e); }
 
 int eyefiworker::UploadPhoto(
         int fileid, std::string macaddress,
         std::string filename, long filesize, std::string filesignature,
         std::string encryption, int flags,
         struct rns__UploadPhotoResponse& r ) try {
     syslog(LOG_INFO,
             "UploadPhoto request from %s with fileid=%d, filename=%s, filesize=%ld,"
             " filesignature=%s, encryption=%s, flags=%04X",
             macaddress.c_str(), fileid, filename.c_str(), filesize,
             filesignature.c_str(), encryption.c_str(), flags );
     std::string::size_type fnl=filename.length();
     if(fnl<sizeof(".tar") || strncmp(filename.c_str()+fnl-sizeof(".tar")+sizeof(""),".tar",sizeof(".tar")))
         throw std::runtime_error(gnu::autosprintf("honestly, I expected the tarball coming here, not '%s'",filename.c_str()));
     std::string the_file(filename,0,fnl-sizeof(".tar")+sizeof(""));
     std::string the_log = the_file+".log";
 
     eyekinfig_t eyekinfig(macaddress);
 
     umask(eyekinfig.get_umask());
 
     std::string td = eyekinfig.get_targetdir();
     tmpdir_t indir(td+"/.incoming.XXXXXX");
 
     std::string tf,lf;
     binary_t digest, idigest;
 #ifdef HAVE_SQLITE
     bool beenthere = false;
 #endif
 
     for(soap_multipart::iterator i=mime.begin(),ie=mime.end();i!=ie;++i) {
 #ifndef NDEBUG
         syslog(LOG_DEBUG,
                 " MIME attachment with id=%s, type=%s, size=%ld",
                 (*i).id, (*i).type, (long)(*i).size );
 #endif
 
         if((*i).id && !strcmp((*i).id,"INTEGRITYDIGEST")) {
             std::string idigestr((*i).ptr,(*i).size);
 #ifndef NDEBUG
             syslog(LOG_DEBUG, " INTEGRITYDIGEST=%s", idigestr.c_str());
 #endif
             idigest.from_hex(idigestr);
         }
         if( (*i).id && !strcmp((*i).id,"FILENAME") ) {
             assert( (*i).type && !strcmp((*i).type,"application/x-tar") );
 #ifdef III_SAVE_TARS
             std::string tarfile = indir.get_file(filename);
             {
                 std::ofstream(tarfile.c_str(),std::ios::out|std::ios::binary).write((*i).ptr,(*i).size);
             }
 #endif
 
             if(!tf.empty()) throw std::runtime_error("already seen tarball");
             if(!digest.empty()) throw std::runtime_error("already have integrity digest");
             digest = integrity_digest((*i).ptr,(*i).size,eyekinfig.get_upload_key());
 #ifndef NDEBUG
             syslog(LOG_DEBUG," computed integrity digest=%s", digest.hex().c_str());
 #endif
 #ifdef HAVE_SQLITE
             if(!(*i).size) {
                 if(!already.is(filename,filesignature,filesize))
                     throw std::runtime_error("got zero-length upload for unknown file");
                 beenthere = true; continue;
             }
 #endif
 
             tarchive_t a((*i).ptr,(*i).size);
             while(a.read_next_header()) {
                 std::string ep = a.entry_pathname(), f = indir.get_file(ep);
                 if(ep==the_file) tf = f;
                 else if(ep==the_log) lf = f;
                 else continue;
                 int fd=open(f.c_str(),O_CREAT|O_WRONLY,0666);
                 if(fd<0)
                     throw std::runtime_error(gnu::autosprintf("failed to create output file '%s'",f.c_str()));
                 if(!a.read_data_into_fd(fd))
                     throw std::runtime_error(gnu::autosprintf("failed to untar file into '%s'",f.c_str()));
                 close(fd);
             }
         }
     }
 
 #ifdef HAVE_SQLITE
     if(beenthere) {
         r.success=true;
         return SOAP_OK;
     }
 #endif
 
     if(tf.empty()) throw std::runtime_error("haven't seen THE file");
     if(digest!=idigest) throw std::runtime_error("integrity digest verification failed");
 
     std::string::size_type ls = tf.rfind('/');
     // XXX: actually, lack of '/' signifies error here
     std::string tbn = (ls==std::string::npos)?tf:tf.substr(ls+1);
     ls = lf.rfind('/');
     std::string lbn = (ls==std::string::npos)?lf:lf.substr(ls+1);
     std::string ttf,tlf;
     bool success = false;
     for(int i=0;i<32767;++i) {
         const char *fmt = i ? "%1$s/(%3$05d)%2$s" : "%1$s/%2$s";
         ttf = (const char*)gnu::autosprintf(fmt,td.c_str(),tbn.c_str(),i);
         if(!lf.empty()) tlf = (const char*)gnu::autosprintf(fmt,td.c_str(),lbn.c_str(),i);
         if( (!link(tf.c_str(),ttf.c_str())) && (lf.empty() || !link(lf.c_str(),tlf.c_str())) ) {
             unlink(tf.c_str());
             if(!lf.empty()) unlink(lf.c_str());
             success=true;
             break;
         }
     }
     std::string cmd = eyekinfig.get_on_upload_photo();
     if(success) {
 #ifdef HAVE_SQLITE
         {
             iiidb_t D(eyekinfig);
             D.prepare(
                     "INSERT INTO photo"
                     " (ctime,mac,fileid,filename,filesize,filesignature,encryption,flags)"
                     " VALUES"
                     " (:ctime,:mac,:fileid,:filename,:filesize,:filesignature,:encryption,:flags)"
             ).bind(":ctime",time(0))
              .bind(":mac",macaddress)
              .bind(":fileid",fileid).bind(":filename",filename)
              .bind(":filesize",filesize).bind(":filesignature",filesignature)
              .bind(":encryption",encryption).bind(":flags",flags)
              .step();
         }
 #endif /* HAVE_SQLITE */
         if((!cmd.empty()) && detached_child()) {
             putenv( gnu::autosprintf("EYEFI_UPLOADED_ORIG=%s",tbn.c_str()) );
             putenv( gnu::autosprintf("EYEFI_MACADDRESS=%s",macaddress.c_str()) );
             putenv( gnu::autosprintf("EYEFI_UPLOADED=%s",ttf.c_str()) );
             if(!lf.empty()) putenv( gnu::autosprintf("EYEFI_LOG=%s",tlf.c_str()) );
             char *argv[] = { (char*)"/bin/sh", (char*)"-c", (char*)cmd.c_str(), 0 };
             execv("/bin/sh",argv);
             syslog(LOG_ERR,"Failed to execute '%s'",cmd.c_str());
             _exit(-1);
         }
     }
 
     r.success = true;
     return SOAP_OK;
 }catch(const std::exception& e) { return E(this,"UploadPhoto",e); }