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netcfg.c
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netcfg.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "netcfg.h"
extern int verbose;
extern int shlinks;
#define NODE_HOST -1
#define NODE_NOTCONNECTED -2
#define NODE_INVALID -3
#define NODE_IPC -4
#define NODE_SHM -5
typedef struct _NETURL {
int node, link;
char *url;
} NETURL;
#define MAX_NETURL 4096
NETURL NetURLs[MAX_NETURL];
int nNetURL;
typedef struct _NETLINK {
int node, link;
int othernode, otherlink;
} NETLINK;
#define MAX_NETLINK MAX_NETURL
NETLINK NetLinks[MAX_NETLINK];
int nNetLink;
static int network, address, port, scale;
static int max_nodeid;
static char* ip2str (int a, char *tmp)
{
int cls[4];
cls[3] = a & 255; a >>= 8;
cls[2] = a & 255; a >>= 8;
cls[1] = a & 255; a >>= 8;
cls[0] = a & 255;
sprintf (tmp, "%d.%d.%d.%d", cls[0], cls[1], cls[2], cls[3]);
return tmp;
}
static void dump_netparams (void)
{
char tmpstr[32];
int a;
if (!verbose)
return;
a = network ? network : address;
printf ("-I-EMU414: %s = %s Port = %d Scale = %d\n",
network ? "Network" : "Address",
ip2str (a, tmpstr),
port,
scale);
}
static char* tcpLinkURL (int node, int link)
{
static char buf[128];
char tmpstr[32];
int a, p;
a = network ? network + node : address;
p = address ? port + node * scale : port;
p += link;
sprintf (buf, "tcp:https://%s:%d", ip2str (a, tmpstr), p);
return &buf[0];
}
static char* skip (char *ptr)
{
while (*ptr && isspace (*ptr))
ptr++;
return ptr;
}
static char* read_number (char *ptr, int *node)
{
int n, m, ch, hasdot;
*node = NODE_INVALID;
ptr = skip (ptr);
if (0 == *ptr)
return ptr;
/* fprintf (stderr, "read_number = [%s]\n", ptr); */
n = 0; m = 0; hasdot = 0;
while (isdigit(*ptr) || '.' == *ptr)
{
ch = *ptr;
if ('.' == ch)
{
n = (n << 8) + m; m = 0;
hasdot = 1;
}
else
m = 10*m + ch - '0';
ptr++;
}
n = hasdot ? (n << 8) + m : m;
*node = n;
return ptr;
}
static char* read_string (char *ptr, char *buf)
{
buf[0] = '\0';
ptr = skip (ptr);
if (0 == *ptr)
return ptr;
while (!isspace (*ptr))
*buf++ = *ptr++;
*buf++ = '\0';
return ptr;
}
static char* read_link (char *ptr, int *node, int *link)
{
ptr = skip (ptr);
/* fprintf (stderr, "read_link = [%s]\n", ptr); */
if (0 == *ptr)
{
*node = NODE_NOTCONNECTED;
return ptr;
}
else if ((0 == strncmp (ptr, "HOST", 4)) ||
(0 == strncmp (ptr, "host", 4)))
{
*node = NODE_HOST;
return ptr + 4;
}
else if ((0 == strncmp (ptr, "SHM", 3)) ||
(0 == strncmp (ptr, "shm", 3)))
{
*node = NODE_SHM;
return ptr + 3;
}
else if ((0 == strncmp (ptr, "IPC", 3)) ||
(0 == strncmp (ptr, "ipc", 3)))
{
*node = NODE_IPC;
return ptr + 3;
}
else if (0 == strncmp (ptr, "processor ", 10))
{
/* "processor" <number> "link" <number> */
ptr = read_number (ptr + 10, node);
if (NODE_INVALID == *node)
return ptr;
ptr = skip (ptr);
if (0 == *ptr)
{
*node = NODE_INVALID;
return ptr;
}
if (strncmp (ptr, "link ", 5))
{
*node = NODE_INVALID;
return ptr;
}
ptr = read_number (ptr + 5, link);
if (NODE_INVALID == *link)
*node = NODE_INVALID;
return ptr;
}
else if (0 == strncmp (ptr, "-", 1))
{
*node = NODE_NOTCONNECTED;
return ptr + 1;
}
ptr = read_number (ptr, node);
if (NODE_INVALID == *node)
return ptr;
if (strncmp (ptr, "-", 1))
{
/* fprintf (stderr, "XXX [%s]\n", ptr); */
return ptr + 1;
}
ptr = read_number (ptr + 1, link);
if (NODE_INVALID == *link)
*node = NODE_INVALID;
return ptr;
}
void add_url (int node, int link, char *url)
{
if (verbose)
printf ("-I-EMU414: Node %d Link%dIn at %s\n", node, link, url);
NetURLs[nNetURL].node = node;
NetURLs[nNetURL].link = link;
NetURLs[nNetURL++].url = strdup (url);
}
int readNetConfig (FILE *fin)
{
char buf[128];
int i, nline;
char *ptr;
int node, link, thenode, thelink;
char url[128];
network = 0xC0A80000; /* 192.168.0.0 */
address = 0;
port = 1984;
scale = 4;
max_nodeid = -1;
nline = 1;
ptr = fgets (buf, sizeof(buf), fin);
while (ptr && !feof (fin))
{
/* fprintf (stderr, "line = [%s]\n", buf); */
ptr = skip (ptr);
if (0 == *ptr)
goto NextLine;
if (0 == strncmp (ptr, "--", 2))
goto NextLine;
else if (0 == strncmp (ptr, "Connect ", 8))
{
/* Connect HOST to processor <number> link <number> */
/* Connect processor <number> link <number> to processor <number> link <number> */
ptr = read_link (ptr + 8, &thenode, &thelink);
if (NODE_INVALID == thenode)
{
printf ("-E-EMU414: Cannot read link at line %d.\n", nline);
return (-1);
}
if (thenode >= 0)
{
ptr = skip (ptr);
if (strncmp (ptr, "to", 2))
{
printf ("-E-EMU414: Missing 'to' at line %d.\n", nline);
return (-1);
}
ptr = read_link (ptr + 2, &node, &link);
if (NODE_INVALID == thenode)
{
printf ("-E-EMU414: Cannot read 'to' link at line %d.\n", nline);
return (-1);
}
if (verbose)
printf ("-I-EMU414: Connect %d-%d => %d-%d\n", thenode, thelink, node, link);
NetLinks[nNetLink].node = thenode;
NetLinks[nNetLink].link = thelink;
NetLinks[nNetLink].othernode = node;
NetLinks[nNetLink++].otherlink = link;
if (verbose)
printf ("-I-EMU414: Connect %d-%d => %d-%d\n", node, link, thenode, thelink);
NetLinks[nNetLink].node = node;
NetLinks[nNetLink].link = link;
NetLinks[nNetLink].othernode = thenode;
NetLinks[nNetLink++].otherlink = thelink;
}
}
else if (0 == strncmp (ptr, "network", 7))
{
/* network <number> */
ptr = read_number (ptr + 7, &network);
if (-1 == network)
{
printf ("-E-EMU414: Invalid network address at line %d.\n", nline);
return (-1);
}
address = 0;
dump_netparams ();
}
else if (0 == strncmp (ptr, "address", 7))
{
/* address <number> */
ptr = read_number (ptr + 7, &address);
if (-1 == address)
{
printf ("-E-EMU414: Invalid address at line %d.\n", nline);
return (-1);
}
network = 0;
dump_netparams ();
}
else if (0 == strncmp (ptr, "port", 4))
{
/* port <number> */
ptr = read_number (ptr + 4, &port);
if (-1 == port)
{
printf ("-E-EMU414: Invalid port at line %d.\n", nline);
return (-1);
}
dump_netparams ();
}
else if (0 == strncmp (ptr, "scale", 5))
{
/* scale <number> */
ptr = read_number (ptr + 5, &scale);
if (-1 == scale)
{
printf ("-E-EMU414: Invalid scale at line %d.\n", nline);
return (-1);
}
dump_netparams ();
}
else if (0 == strncmp (ptr, "link", 4))
{
/* "link" <link> string */
/* "link" "IPC"|"SHM", default "IPC" */
ptr = read_link (ptr + 4, &node, &link);
if (NODE_SHM == node)
{
shlinks = 1;
if (verbose)
printf ("-I-EMU414: Default link protocol is SHM.\n");
}
else if (NODE_IPC == node)
{
shlinks = 0;
if (verbose)
printf ("-I-EMU414: Default link protocol is IPC.\n");
}
else if (node < 0)
{
printf ("-E-EMU414: Invalid link at line %d.\n", nline);
return (-1);
}
else
{
ptr = read_string (ptr, url);
if (0 == url[0])
{
printf ("-E-EMU414: Missing URL at line %d.\n", nline);
return (-1);
}
add_url (node, link, url);
}
}
else if (0 == strncmp (ptr, "node", 4))
{
int j, p;
char tmpstr[128];
char *colon1, *colon2;
p = port;
/* "node" from[-to] [proto:https://address[:port]] */
ptr = read_number (ptr + 4, &thenode);
if (-1 == thenode)
{
printf ("-E-EMU414: Invalid node at line %d.\n", nline);
return (-1);
}
node = thenode;
if (0 == strncmp (ptr, "-", 1))
{
ptr = read_number (ptr + 1, &node);
if (-1 == node)
{
printf ("-E-EMU414: Invalid node at line %d.\n", nline);
return (-1);
}
}
tmpstr[0] = '\0';
ptr = skip (ptr);
if (0 == *ptr)
goto ProcessNode;
if (0 == strncmp (ptr, "--", 2))
{
goto ProcessNode;
}
ptr = read_string (ptr, tmpstr);
if (*tmpstr)
{
/* proto:https://address[:port] */
colon1 = strchr (tmpstr, ':');
colon2 = strrchr (tmpstr, ':');
if (NULL == colon1)
{
printf ("-E-EMU414: Invalid URL at line %d.\n", nline);
return (-1);
}
if (colon1 == colon2) /* proto:https://address */
p = port;
else
{
/* parse port, make proto:https://address */
p = atoi (colon2 + 1);
*colon2 = '\0';
}
}
ProcessNode:
/* define links */
for (i = thenode; i <= node; i++)
for (j = 0; j < 4; j++)
{
if (*tmpstr)
{
int temp = p + scale * (i - thenode) + j; /* relative */
if (p == port)
temp = p + scale * i + j; /* absolute */
sprintf (url, "%s:%d", tmpstr, temp);
}
else
strcpy (url, tcpLinkURL (i, j));
add_url (i, j, url);
}
}
else if (isdigit(*ptr))
{
/* number <link> <link> <link> <link>
* link := "host" | "-" | number "-" number
*/
ptr = read_number (ptr, &thenode);
if (-1 == node)
{
printf ("-E-EMU414: Cannot read node id at line %d.\n", nline);
return (-1);
}
for (i = 0; i < 4; i++)
{
ptr = skip (ptr);
if (0 == *ptr)
break;
if (0 == strncmp (ptr, "--", 2))
break;
ptr = read_link (ptr, &node, &link);
if (NODE_INVALID == node)
{
printf ("-E-EMU414: Cannot read link at line %d.\n", nline);
return (-1);
}
if (node >= 0) /* skip HOST and NOT CONNECTED links */
{
if (verbose)
printf ("-I-EMU414: Connect %d-%d => %d-%d\n", thenode, i, node, link);
NetLinks[nNetLink].node = thenode;
NetLinks[nNetLink].link = i;
NetLinks[nNetLink].othernode = node;
NetLinks[nNetLink++].otherlink = link;
}
}
}
NextLine:
ptr = fgets (buf, sizeof(buf), fin);
nline++;
}
return 0;
}
int connectedNetLink(int node, int link, int *othernode, int *otherlink)
{
int i;
for (i = 0; i < nNetLink; i++)
{
if ((node == NetLinks[i].node) && (link == NetLinks[i].link))
{
*othernode = NetLinks[i].othernode;
*otherlink = NetLinks[i].otherlink;
return 0;
}
}
return -1;
}
char* netLinkURL (int node, int link)
{
static char buf[128];
int i;
for (i = 0; i < nNetURL; i++)
{
if ((node == NetURLs[i].node) && (link == NetURLs[i].link))
return NetURLs[i].url;
}
sprintf (buf, "ipc:https:///tmp/node%d-%d.lnk", node, link);
return buf;
}
int sharedLinks (void)
{
return shlinks;
}
int maxNodeID (void)
{
int i, ret;
if (max_nodeid >= 0)
return max_nodeid;
ret = -1;
for (i = 0; i < nNetLink; i++)
{
if (NetLinks[i].node > ret)
ret = NetLinks[i].node;
if (NetLinks[i].othernode > ret)
ret = NetLinks[i].othernode;
}
if (-1 == ret) ret = 0;
max_nodeid = ret;
return max_nodeid;
}
#if defined(NETCFG_TEST)
int verbose = 1;
int shlinks = 0;
int main(int argc, char*argv[])
{
FILE *fin;
if (2 != argc)
{
fprintf (stderr, "usage: netcfg <file>\n");
exit (1);
}
if ((fin = fopen (argv[1], "r")) == NULL)
{
fprintf (stderr, "cannot open %s\n", argv[1]);
exit (1);
}
readNetConfig (fin);
fclose (fin);
return 0;
}
#endif