lib/mr_param.c

   1 /*
   2  *      $Source$
   3  *      $Author$
   4  *      $Header$
   5  *
   6  *      Copyright (C) 1987 by the Massachusetts Institute of Technology
   7  *      For copying and distribution information, please see the file
   8  *      <mit-copyright.h>.
   9  *
  10  */
  11
  12 #ifndef lint
  13 static char *rcsid_sms_param_c = "$Header$";
  14 #endif lint
  15
  16 #include <mit-copyright.h>
  17 #include <sys/types.h>
  18 #include <netinet/in.h>
  19 #include "sms_private.h"
  20
  21 /*
  22  * GDB operations to send and recieve RPC requests and replies.
  23  */
  24
  25 /*
  26  * This doesn't get called until after the actual buffered write completes.
  27  * In a non-preflattening version of this, this would then queue the
  28  * write of the next bunch of data.
  29  */
  30
  31 sms_cont_send(op, hcon, arg)
  32     OPERATION op;
  33     HALF_CONNECTION hcon;
  34     struct sms_params *arg;
  35 {
  36     op->result = OP_SUCCESS;
  37     free(arg->sms_flattened);
  38     arg->sms_flattened = NULL;
  39
  40     return OP_COMPLETE;
  41 }
  42
  43 sms_start_send(op, hcon, arg)
  44     OPERATION op;
  45     HALF_CONNECTION hcon;
  46     register struct sms_params *arg;
  47 {
  48     int i, len;
  49     unsigned int sms_size;
  50     int *argl;
  51     char *buf, *bp;
  52
  53     /*
  54      * This should probably be split into several routines.
  55      * It could also probably be made more efficient (punting most
  56      * of the argument marshalling stuff) by doing I/O directly
  57      * from the strings.  Anyone for a scatter/gather sms_send_data?
  58      *
  59      * that would look a lot like the uio stuff in the kernel..  hmm.
  60      */
  61
  62     /*
  63      * Marshall the entire data right now..
  64      * We are sending the version number,
  65      * total request size, request number,
  66      * argument count, and then each argument.
  67      * At least for now, each argument is a string, which is
  68      * sent as a count of bytes followed by the bytes
  69      * (including the trailing '\0'), padded
  70      * to a longword boundary.
  71      */
  72
  73     sms_size = 4 * sizeof(long);
  74
  75     argl = (int *)malloc((unsigned)(sizeof(int) * arg->sms_argc));
  76
  77     /*
  78      * For each argument, figure out how much space is needed.
  79      */
  80
  81     for (i = 0; i < arg->sms_argc; ++i) {
  82         if (arg->sms_argl)
  83             argl[i] = len = arg->sms_argl[i];
  84         else
  85             argl[i] = len = strlen(arg->sms_argv[i]) + 1;
  86         sms_size += sizeof(long) + len;
  87         /* Round up to next longword boundary.. */
  88         sms_size = sizeof(long) * howmany(sms_size, sizeof(long));
  89     }
  90
  91     arg->sms_flattened = buf = malloc(sms_size);
  92
  93     bzero(arg->sms_flattened, sms_size);
  94
  95     arg->sms_size = sms_size;
  96
  97     /*
  98      * This is gross.  Any better suggestions, anyone?
  99      * It should work on the RT's, since malloc is guaranteed to
 100      * return a pointer which is aligned correctly for any data.
 101      */
 102
 103     ((long *)buf)[0] = htonl(sms_size);
 104     ((long *)buf)[1] = htonl(arg->sms_version_no);
 105     ((long *)buf)[2] = htonl(arg->sms_procno);
 106     ((long *)buf)[3] = htonl(arg->sms_argc);
 107
 108     /*
 109      * bp is a pointer into the point in the buffer to put
 110      * the next argument.
 111      */
 112
 113     bp = (char *)(((long *)buf) + 4);
 114
 115     for (i = 0; i<arg->sms_argc; ++i) {
 116         len = argl[i];
 117         *((long *)bp) = htonl(len);
 118         bp += sizeof(long);
 119         bcopy(arg->sms_argv[i], bp, len);
 120         bp += sizeof(long) * howmany(len, sizeof(long));
 121     }
 122     op->fcn.cont = sms_cont_send;
 123     arg->sms_size = sms_size;
 124
 125     free(argl);
 126
 127     if (gdb_send_data(hcon, arg->sms_flattened, sms_size) == OP_COMPLETE)
 128         return sms_cont_send(op, hcon, arg);
 129     else return OP_RUNNING;
 130 }
 131
 132 sms_cont_recv(op, hcon, argp)
 133     OPERATION op;
 134     HALF_CONNECTION hcon;
 135     sms_params **argp;
 136 {
 137     int done = FALSE;
 138     char *cp;
 139     int *ip;
 140     int i;
 141     register sms_params *arg = *argp;
 142
 143     while (!done) {
 144         switch (arg->sms_state) {
 145         case S_RECV_START:
 146             arg->sms_state = S_RECV_DATA;
 147             if (gdb_receive_data(hcon, (caddr_t)&arg->sms_size,
 148                                  sizeof(long)) == OP_COMPLETE)
 149                 continue;
 150             done = TRUE;
 151             break;
 152         case S_RECV_DATA:
 153             fflush(stdout);
 154             /* Should validate that length is reasonable */
 155             arg->sms_size = ntohl(arg->sms_size);
 156             if (arg->sms_size > 65536) {
 157                 return OP_CANCELLED;
 158             }
 159             arg->sms_flattened = malloc(arg->sms_size);
 160             arg->sms_state = S_DECODE_DATA;
 161             bcopy((caddr_t)&arg->sms_size, arg->sms_flattened, sizeof(long));
 162
 163             if (gdb_receive_data(hcon,
 164                                  arg->sms_flattened + sizeof(long),
 165                                  arg->sms_size - sizeof(long))
 166                 == OP_COMPLETE)
 167                 continue;
 168             done = TRUE;
 169             break;
 170         case S_DECODE_DATA:
 171             cp = arg->sms_flattened;
 172             ip = (int *) cp;
 173             /* we already got the overall length.. */
 174             for(i=1; i <4; i++) ip[i] = ntohl(ip[i]);
 175             arg->sms_version_no = ip[1];
 176             if (arg->sms_version_no != SMS_VERSION_1 &&
 177                 arg->sms_version_no != SMS_VERSION_2)
 178                 arg->sms_status = SMS_VERSION_MISMATCH;
 179             else arg->sms_status = ip[2];
 180             arg->sms_argc = ip[3];
 181             cp += 4 * sizeof(int);
 182             arg->sms_argv=(char **)malloc(arg->sms_argc *sizeof(char **));
 183             arg->sms_argl=(int *)malloc(arg->sms_argc *sizeof(int *));
 184
 185             for (i = 0; i<arg->sms_argc; ++i) {
 186                 u_short nlen = ntohl(* (int *) cp);
 187                 cp += sizeof (long);
 188                 if (cp + nlen > arg->sms_flattened + arg->sms_size) {
 189                     free(arg->sms_flattened);
 190                     arg->sms_flattened = NULL;
 191                     return OP_CANCELLED;
 192                 }
 193                 arg->sms_argv[i] = (char *)malloc(nlen);
 194                 bcopy(cp, arg->sms_argv[i], nlen);
 195                 arg->sms_argl[i]=nlen;
 196                 cp += sizeof(long) * howmany(nlen, sizeof(long));
 197             }
 198             free(arg->sms_flattened);
 199             arg->sms_flattened = NULL;
 200             return OP_COMPLETE;
 201         }
 202     }
 203     return OP_RUNNING;
 204 }
 205
 206
 207 sms_start_recv(op, hcon, argp)
 208     OPERATION op;
 209     HALF_CONNECTION hcon;
 210     struct sms_params **argp;
 211 {
 212     register sms_params *arg = *argp;
 213     if (!arg) {
 214         *argp = arg = (sms_params *)malloc(sizeof(sms_params));
 215         arg->sms_argl = NULL;
 216         arg->sms_argv = NULL;
 217         arg->sms_flattened = NULL;
 218     }
 219     arg->sms_state = S_RECV_START;
 220     op->fcn.cont = sms_cont_recv;
 221     return sms_cont_recv(op, hcon, argp);
 222 }
 223
 224 sms_destroy_reply(reply)
 225     sms_params *reply;
 226 {
 227     int i;
 228     if (reply) {
 229         if (reply->sms_argl)
 230             free(reply->sms_argl);
 231         reply->sms_argl = NULL;
 232         if (reply->sms_flattened)
 233             free(reply->sms_flattened);
 234         reply->sms_flattened = NULL;
 235         if (reply->sms_argv) {
 236             for (i=0; i<reply->sms_argc; i++) {
 237                 if (reply->sms_argv[i])
 238                     free (reply->sms_argv[i]);
 239                 reply->sms_argv[i] = NULL;
 240             }
 241             free(reply->sms_argv);
 242         }
 243         reply->sms_argv = NULL;
 244         free(reply);
 245     }
 246 }
 247
 248 /*
 249  * Local Variables:
 250  * mode: c
 251  * c-indent-level: 4
 252  * c-continued-statement-offset: 4
 253  * c-brace-offset: -4
 254  * c-argdecl-indent: 4
 255  * c-label-offset: -4
 256  * End:
 257  */