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How to use copyout method of csource Package

Best Syzkaller code snippet using csource.copyout

csource.go

Source:csource.go

...174		argCopyout := len(call.Copyout) != 0175		emitCall := ctx.opts.NetInjection ||176			callName != "syz_emit_ethernet" &&177				callName != "syz_extract_tcp_res"178		// TODO: if we don't emit the call we must also not emit copyin, copyout and fault injection.179		// However, simply skipping whole iteration breaks tests due to unused static functions.180		if emitCall {181			ctx.emitCall(w, call, ci, resCopyout || argCopyout, trace)182		} else if trace {183			fmt.Fprintf(w, "\t(void)res;\n")184		}185		// Copyout.186		if resCopyout || argCopyout {187			ctx.copyout(w, call, resCopyout)188		}189		calls = append(calls, w.String())190	}191	return calls, p.Vars192}193func (ctx *context) emitCall(w *bytes.Buffer, call prog.ExecCall, ci int, haveCopyout, trace bool) {194	callName := call.Meta.CallName195	native := ctx.sysTarget.SyscallNumbers && !strings.HasPrefix(callName, "syz_")196	fmt.Fprintf(w, "\t")197	if haveCopyout || trace {198		fmt.Fprintf(w, "res = ")199	}200	ctx.emitCallName(w, call, native)201	for ai, arg := range call.Args {202		if native || ai > 0 {203			fmt.Fprintf(w, ", ")204		}205		switch arg := arg.(type) {206		case prog.ExecArgConst:207			if arg.Format != prog.FormatNative && arg.Format != prog.FormatBigEndian {208				panic("sring format in syscall argument")209			}210			fmt.Fprintf(w, "%v", ctx.constArgToStr(arg, true, native))211		case prog.ExecArgResult:212			if arg.Format != prog.FormatNative && arg.Format != prog.FormatBigEndian {213				panic("sring format in syscall argument")214			}215			val := ctx.resultArgToStr(arg)216			if native && ctx.target.PtrSize == 4 {217				// syscall accepts args as ellipsis, resources are uint64218				// and take 2 slots without the cast, which would be wrong.219				val = "(intptr_t)" + val220			}221			fmt.Fprintf(w, "%v", val)222		default:223			panic(fmt.Sprintf("unknown arg type: %+v", arg))224		}225	}226	for i := 0; i < call.Meta.MissingArgs; i++ {227		if native || len(call.Args) != 0 {228			fmt.Fprintf(w, ", ")229		}230		fmt.Fprintf(w, "0")231	}232	fmt.Fprintf(w, ");")233	comment := ctx.target.AnnotateCall(call)234	if len(comment) != 0 {235		fmt.Fprintf(w, " /* %s */", comment)236	}237	fmt.Fprintf(w, "\n")238	if trace {239		cast := ""240		if !native && !strings.HasPrefix(callName, "syz_") {241			// Potentially we casted a function returning int to a function returning intptr_t.242			// So instead of intptr_t -1 we can get 0x00000000ffffffff. Sign extend it to intptr_t.243			cast = "(intptr_t)(int)"244		}245		fmt.Fprintf(w, "\tfprintf(stderr, \"### call=%v errno=%%u\\n\", %vres == -1 ? errno : 0);\n", ci, cast)246	}247}248func (ctx *context) emitCallName(w *bytes.Buffer, call prog.ExecCall, native bool) {249	callName := call.Meta.CallName250	if native {251		fmt.Fprintf(w, "syscall(%v%v", ctx.sysTarget.SyscallPrefix, callName)252	} else if strings.HasPrefix(callName, "syz_") {253		fmt.Fprintf(w, "%v(", callName)254	} else {255		args := strings.Repeat(",intptr_t", len(call.Args))256		if args != "" {257			args = args[1:]258		}259		fmt.Fprintf(w, "((intptr_t(*)(%v))CAST(%v))(", args, callName)260	}261}262func (ctx *context) generateCsumInet(w *bytes.Buffer, addr uint64, arg prog.ExecArgCsum, csumSeq int) {263	fmt.Fprintf(w, "\tstruct csum_inet csum_%d;\n", csumSeq)264	fmt.Fprintf(w, "\tcsum_inet_init(&csum_%d);\n", csumSeq)265	for i, chunk := range arg.Chunks {266		switch chunk.Kind {267		case prog.ExecArgCsumChunkData:268			fmt.Fprintf(w, "\tNONFAILING(csum_inet_update(&csum_%d, (const uint8*)0x%x, %d));\n",269				csumSeq, chunk.Value, chunk.Size)270		case prog.ExecArgCsumChunkConst:271			fmt.Fprintf(w, "\tuint%d csum_%d_chunk_%d = 0x%x;\n",272				chunk.Size*8, csumSeq, i, chunk.Value)273			fmt.Fprintf(w, "\tcsum_inet_update(&csum_%d, (const uint8*)&csum_%d_chunk_%d, %d);\n",274				csumSeq, csumSeq, i, chunk.Size)275		default:276			panic(fmt.Sprintf("unknown checksum chunk kind %v", chunk.Kind))277		}278	}279	fmt.Fprintf(w, "\tNONFAILING(*(uint16*)0x%x = csum_inet_digest(&csum_%d));\n",280		addr, csumSeq)281}282func (ctx *context) copyin(w *bytes.Buffer, csumSeq *int, copyin prog.ExecCopyin) {283	switch arg := copyin.Arg.(type) {284	case prog.ExecArgConst:285		if arg.BitfieldOffset == 0 && arg.BitfieldLength == 0 {286			ctx.copyinVal(w, copyin.Addr, arg.Size, ctx.constArgToStr(arg, true, false), arg.Format)287		} else {288			if arg.Format != prog.FormatNative && arg.Format != prog.FormatBigEndian {289				panic("bitfield+string format")290			}291			htobe := ""292			if arg.Format == prog.FormatBigEndian {293				htobe = fmt.Sprintf("htobe%v", arg.Size*8)294			}295			fmt.Fprintf(w, "\tNONFAILING(STORE_BY_BITMASK(uint%v, %v, 0x%x, %v, %v, %v));\n",296				arg.Size*8, htobe, copyin.Addr, ctx.constArgToStr(arg, false, false),297				arg.BitfieldOffset, arg.BitfieldLength)298		}299	case prog.ExecArgResult:300		ctx.copyinVal(w, copyin.Addr, arg.Size, ctx.resultArgToStr(arg), arg.Format)301	case prog.ExecArgData:302		fmt.Fprintf(w, "\tNONFAILING(memcpy((void*)0x%x, \"%s\", %v));\n",303			copyin.Addr, toCString(arg.Data, arg.Readable), len(arg.Data))304	case prog.ExecArgCsum:305		switch arg.Kind {306		case prog.ExecArgCsumInet:307			*csumSeq++308			ctx.generateCsumInet(w, copyin.Addr, arg, *csumSeq)309		default:310			panic(fmt.Sprintf("unknown csum kind %v", arg.Kind))311		}312	default:313		panic(fmt.Sprintf("bad argument type: %+v", arg))314	}315}316func (ctx *context) copyinVal(w *bytes.Buffer, addr, size uint64, val string, bf prog.BinaryFormat) {317	switch bf {318	case prog.FormatNative, prog.FormatBigEndian:319		fmt.Fprintf(w, "\tNONFAILING(*(uint%v*)0x%x = %v);\n", size*8, addr, val)320	case prog.FormatStrDec:321		if size != 20 {322			panic("bad strdec size")323		}324		fmt.Fprintf(w, "\tNONFAILING(sprintf((char*)0x%x, \"%%020llu\", (long long)%v));\n", addr, val)325	case prog.FormatStrHex:326		if size != 18 {327			panic("bad strdec size")328		}329		fmt.Fprintf(w, "\tNONFAILING(sprintf((char*)0x%x, \"0x%%016llx\", (long long)%v));\n", addr, val)330	case prog.FormatStrOct:331		if size != 23 {332			panic("bad strdec size")333		}334		fmt.Fprintf(w, "\tNONFAILING(sprintf((char*)0x%x, \"%%023llo\", (long long)%v));\n", addr, val)335	default:336		panic("unknown binary format")337	}338}339func (ctx *context) copyout(w *bytes.Buffer, call prog.ExecCall, resCopyout bool) {340	if ctx.sysTarget.OS == "fuchsia" {341		// On fuchsia we have real system calls that return ZX_OK on success,342		// and libc calls that are casted to function returning intptr_t,343		// as the result int -1 is returned as 0x00000000ffffffff rather than full -1.344		if strings.HasPrefix(call.Meta.CallName, "zx_") {345			fmt.Fprintf(w, "\tif (res == ZX_OK)")346		} else {347			fmt.Fprintf(w, "\tif ((int)res != -1)")348		}349	} else {350		fmt.Fprintf(w, "\tif (res != -1)")351	}352	copyoutMultiple := len(call.Copyout) > 1 || resCopyout && len(call.Copyout) > 0353	if copyoutMultiple {354		fmt.Fprintf(w, " {")355	}356	fmt.Fprintf(w, "\n")357	if resCopyout {358		fmt.Fprintf(w, "\t\tr[%v] = res;\n", call.Index)359	}360	for _, copyout := range call.Copyout {361		fmt.Fprintf(w, "\t\tNONFAILING(r[%v] = *(uint%v*)0x%x);\n",362			copyout.Index, copyout.Size*8, copyout.Addr)363	}364	if copyoutMultiple {365		fmt.Fprintf(w, "\t}\n")366	}367}368func (ctx *context) constArgToStr(arg prog.ExecArgConst, handleBigEndian, native bool) string {369	mask := (uint64(1) << (arg.Size * 8)) - 1370	v := arg.Value & mask371	val := fmt.Sprintf("%v", v)372	if v == ^uint64(0)&mask {373		val = "-1"374	} else if v >= 10 {375		val = fmt.Sprintf("0x%x", v)376	}377	if native && arg.Size == 8 {378		// syscall() is variadic, so constant arguments must be explicitly...

copyout

Using AI Code Generation

1import (2func main() {3    source, err := os.Open("1.go")4    if err != nil {5        fmt.Println(err)6    }7    defer source.Close()8    destination, err := os.Create("2.go")9    if err != nil {10        fmt.Println(err)11    }12    defer destination.Close()13    nBytes, err := io.Copy(destination, source)14    if err != nil {15        fmt.Println(err)16    }17    fmt.Printf("Copied %d bytes.", nBytes)18}

copyout

Using AI Code Generation

1import java.io.*;2{3public static void main(String args[])4{5{6FileInputStream in=new FileInputStream("1.go");7FileOutputStream out=new FileOutputStream("2.go");8int c;9while((c=in.read())!=-1)10{11out.write(c);12}13in.close();14out.close();15}16catch(IOException e)17{18System.out.println("Exception Occured");19}20}21}22import java.io.*;23{24public static void main(String args[])25{26{27FileInputStream in=new FileInputStream("1.go");28FileOutputStream out=new FileOutputStream("2.go");29int c;30while((c=in.read())!=-1)31{32out.write(c);33}34in.close();35out.close();36}37catch(IOException e)38{39System.out.println("Exception Occured");40}41}42}

copyout

Using AI Code Generation

1import "fmt"2func main() {3    fmt.Println("Enter a number:")4    fmt.Scan(&a)5    fmt.Println("You entered:", a)6}7import "fmt"8func main() {9    fmt.Println("Enter a number:")10    fmt.Scan(&a)11    fmt.Println("You entered:", a)12}13import "fmt"14func main() {15    fmt.Println("Enter a number:")16    fmt.Scan(&a)17    fmt.Println("You entered:", a)18}19import "fmt"20func main() {21    fmt.Println("Enter a number:")22    fmt.Scan(&a)23    fmt.Println("You entered:", a)24}25import "fmt"26func main() {27    fmt.Println("Enter a number:")28    fmt.Scan(&a)29    fmt.Println("You entered:", a)30}31import "fmt"32func main() {33    fmt.Println("Enter a number:")34    fmt.Scan(&a)35    fmt.Println("You entered:", a)36}37import "fmt"38func main() {39    fmt.Println("Enter a number:")40    fmt.Scan(&a)41    fmt.Println("You entered:", a)42}43import "fmt"44func main() {45    fmt.Println("Enter a number:")46    fmt.Scan(&a)47    fmt.Println("You entered:", a)48}49import "fmt"50func main() {51    fmt.Println("Enter a number:")

copyout

Using AI Code Generation

1import (2func main() {3	src, err := os.Open("1.go")4	if err != nil {5		fmt.Println(err)6		os.Exit(1)7	}8	defer src.Close()9	dst, err := os.Create("2.go")10	if err != nil {11		fmt.Println(err)12		os.Exit(1)13	}14	defer dst.Close()15	_, err = io.Copy(dst, src)16	if err != nil {17		fmt.Println(err)18		os.Exit(1)19	}20}21import (22func main() {23	src, err := os.Open("1.go")24	if err != nil {25		fmt.Println(err)26		os.Exit(1)27	}28	defer src.Close()29	dst, err := os.Create("2.go")30	if err != nil {31		fmt.Println(err)32		os.Exit(1)33	}34	defer dst.Close()35	_, err = io.Copy(dst, src)36	if err != nil {37		fmt.Println(err)38		os.Exit(1)39	}40}

copyout

Using AI Code Generation

1import java.io.*;2{3public static void main(String args[])throws IOException4{5csource a=new csource();6a.copyout("file1.txt","file2.txt");7}8}9import java.io.*;10{11public static void main(String args[])throws IOException12{13csource a=new csource();14a.copyin("file1.txt","file2.txt");15}16}17import java.io.*;18{19public static void main(String args[])throws IOException20{21csource a=new csource();22a.copyin("file1.txt","file2.txt");23}24}25import java.io.*;26{27public static void main(String args[])throws IOException28{29csource a=new csource();30a.copyin("file1.txt","file2.txt");31}32}33import java.io.*;34{35public static void main(String args[])throws IOException36{37csource a=new csource();38a.copyin("file1.txt","file2.txt");39}40}

copyout

Using AI Code Generation

1import (2func main() {3        file, err := os.Open("1.go")4        if err != nil {5                fmt.Println(err)6        }7        defer file.Close()8        newfile, err := os.Create("2.go")9        if err != nil {10                fmt.Println(err)11        }12        defer newfile.Close()13        io.Copy(newfile, file)14}15import (16func main() {17        file, err := os.Open("1.go")18        if err != nil {19                fmt.Println(err)20        }21        defer file.Close()22        newfile, err := os.Create("3.go")23        if err != nil {24                fmt.Println(err)25        }26        defer newfile.Close()27        io.Copy(newfile, file)28}

copyout

Using AI Code Generation

1int main()2{3CProjectManagerList *pmList = new CProjectManagerList();4CProjectManager *pm = pmList->getProjectManager(0);5CProjectList *pList = pm->getProjectList();6CProject *p = pList->getProject(0);7CFileList *fList = p->getFileList();8CFile *f = fList->getFile(0);9CFunctionList *funcList = f->getFunctionList();10CFunction *func = funcList->getFunction(0);11CSource *src = func->getSource();12CFileList *fList = new CFileList();13CFile *f = fList->getFile(0);14CFunctionList *funcList = f->getFunctionList();15CFunction *func = funcList->getFunction(0);16CSource *src = func->getSource();17char *s = src->copyOut();18CFile *f = new CFile();19CFunctionList *funcList = f->getFunctionList();20CFunction *func = funcList->getFunction(0);21CSource *src = func->getSource();22char *s = src->copyOut();23CFunction *func = new CFunction();24CSource *src = func->getSource();25char *s = src->copyOut();26CSource *src = new CSource();27char *s = src->copyOut();28return 0;29}

copyout

Using AI Code Generation

1import java.io.*;2import java.util.*;3{4public static void main(String args[]) throws IOException5{6csource c=new csource();7c.copyout("2.txt");8}9}10import java.io.*;11import java.util.*;12{13public void copyout(String s) throws IOException14{15FileInputStream f=new FileInputStream(s);16int i;17while((i=f.read())!=-1)18{19System.out.print((char)i);20}21f.close();22}23}

copyout

Using AI Code Generation

1void main()2{3csource c;4ofstream fout;5fout.open("2.cpp");6if(!fout)7{8cout<<"Error opening output file";9exit(1);10}11c.copyout(fout);12fout.close();13}14void main()15{16ifstream fin;17ofstream fout;18fin.open("1.txt");19if(!fin)20{21cout<<"Error opening input file";22exit(1);23}24fout.open("2.txt");25if(!fout)26{27cout<<"Error opening output file";28exit(1);29}30char ch;31while(!fin.eof())32{33fin.get(ch);34if(!fin.eof())35fout.put(ch);36}37fin.close();38fout.close();39}

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