Splash: SNMP Plus a Lightweight API for SNAP Handling

00001 /* snap-1.0. Copyright (C) 2000 by Jonathan T. Moore and Michael Hicks.
00002  *
00003  * snapdis.c : SNAP disassembler. Goes from wire-format back to
00004  *   (ascii) SNAP assembly language.
00005  *
00006  * $Id: snapdis.c,v 1.1 2002/12/22 16:20:16 wdebruij Exp $
00007  */
00008 
00009 #include <stdio.h>
00010 #include <sys/types.h>
00011 #include <sys/stat.h>
00012 #include <string.h>
00013 #include <fcntl.h>
00014 #include <unistd.h>
00015 #include "../lib/bytecode.h"
00016 #include "../lib/packet.h"
00017 #include "../lib/io.h"
00018 #include "../lib/memalloc.h"
00019 #include "../lib/d_printf.h"
00020 
00021 int infd;           /* input file descriptor */
00022 FILE *outfile;              /* output file pointer */
00023 
00024 extern char *basename(const char *);
00025 
00026 void parse_cmdline(int argc, char **argv);
00027 
00028 int main(int argc, char **argv) {
00029   buffer_t buf;
00030   packet_t *p;
00031   int packet_lenb;
00032 
00033   d_printf(10,"%s:%d: starting up\n",__FILE__,__LINE__);
00034 
00035   outfile = stdout;
00036 
00037   parse_cmdline(argc,argv);
00038   packet_lenb = file_to_str(infd,&buf);
00039   p = unmarshal_packet(buf.s,packet_lenb,buf.lenb);
00040   if (p != NULL) {
00041     fprintf_packet(outfile,p);
00042     fflush(outfile);
00043     return(0);
00044   }
00045   else
00046     return(1);
00047 }
00048 
00049 void usage(int argc, char **argv) {
00050   printf("usage: %s [-?] [-o outfile] infile\n",basename(argv[0]));
00051   printf("\t-? : print this help\n");
00052   printf("\t-o : set the output file name (default = stdout)\n");
00053 }
00054 
00055 void parse_cmdline(int argc, char **argv) {
00056   char *opts = "?o:";
00057   char c;
00058   int args_expected = 1;
00059   int args_processed = 0;
00060   int argidx;
00061   char *outfilename;
00062   char *infilename;
00063 
00064   while((c = getopt(argc,argv,opts)) != EOF) {
00065     switch(c) {
00066     case '?':
00067       usage(argc,argv);
00068       exit(1);
00069     case 'o':
00070       outfilename = optarg;
00071       if (strcmp(outfilename,"-") != 0) {
00072     outfile = fopen(outfilename,"w");
00073     if (outfile == NULL) {
00074       fprintf(stderr,"%s: unable to open file \"%s\" for output\n",
00075           basename(argv[0]),outfilename);
00076       fflush(stderr);
00077       exit(1);
00078     }
00079       }
00080       break;
00081     }
00082   }
00083   argidx = optind;
00084   while(args_processed < args_expected) {
00085     if (argidx >= argc) {
00086       /* missing arguments */
00087       printf("%s: missing argument(s)\n",basename(argv[0]));
00088       usage(argc,argv);
00089       exit(1);
00090     }
00091     switch(args_processed) {
00092     case 0:
00093       infilename = argv[argidx];
00094       if (strcmp(infilename,"-") != 0) {
00095     infd = open(infilename,O_RDONLY);
00096     if (infd < 0) {
00097       fprintf(stderr,"%s: unable to open file \"%s\" for input\n",
00098           basename(argv[0]),infilename);
00099       fflush(stderr);
00100       exit(1);
00101     }
00102       }
00103       break;
00104     }
00105     argidx++;
00106     args_processed++;
00107   }
00108   if (argidx < argc) {
00109     /* extra arguments */
00110     printf("%s: extra argument(s)\n",basename(argv[0]));
00111     usage(argc,argv);
00112     exit(1);
00113   }
00114   return;
00115 }
00116
Splash - Documentation

SNMP Plus a Lightweight API for SNAP Handling

snap-1.1-wjdb/utils/snapdis.c
