src/libstatgrab/network_stats.c

/*
 * i-scream central monitoring system
 * http://www.i-scream.org
 * Copyright (C) 2000-2004 i-scream
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 * 02111-1307 USA
 *
 * $Id: network_stats.c,v 1.25 2004/01/23 23:23:33 pajs Exp $
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdlib.h>
#include <string.h>
#include "statgrab.h"
#include <time.h>
#ifdef SOLARIS
#include <kstat.h>
#include <sys/sysinfo.h>
#endif
#ifdef LINUX
#include <stdio.h>
#include <sys/types.h>
#include <regex.h>
#include "tools.h"
#endif
#ifdef ALLBSD
#include <sys/types.h>
#include <sys/socket.h>
#include <ifaddrs.h>
#include <net/if.h>
#include <net/if_media.h>
#include <sys/ioctl.h>
#endif

static network_stat_t *network_stats=NULL;
static int interfaces=0;

void network_stat_init(int start, int end, network_stat_t *net_stats){

        for(net_stats+=start; start<end; start++){
                net_stats->interface_name=NULL;
                net_stats->tx=0;
                net_stats->rx=0;
                net_stats++;
        }
}

network_stat_t *network_stat_malloc(int needed_entries, int *cur_entries, network_stat_t *net_stats){

        if(net_stats==NULL){

                if((net_stats=malloc(needed_entries * sizeof(network_stat_t)))==NULL){
                        return NULL;
                }
                network_stat_init(0, needed_entries, net_stats);
                *cur_entries=needed_entries;

                return net_stats;
        }


        if(*cur_entries<needed_entries){
                net_stats=realloc(net_stats, (sizeof(network_stat_t)*needed_entries));
                if(net_stats==NULL){
                        return NULL;
                }
                network_stat_init(*cur_entries, needed_entries, net_stats);
                *cur_entries=needed_entries;
        }

        return net_stats;
}


network_stat_t *get_network_stats(int *entries){

        static int sizeof_network_stats=0;      
        network_stat_t *network_stat_ptr;

#ifdef SOLARIS
        kstat_ctl_t *kc;
        kstat_t *ksp;
        kstat_named_t *knp;
#endif

#ifdef LINUX
        FILE *f;
        /* Horrible big enough, but it should be easily big enough */
        char line[8096];
        regex_t regex;
        regmatch_t line_match[4];
#endif
#ifdef ALLBSD
        struct ifaddrs *net, *net_ptr;
        struct if_data *net_data;
#endif

#ifdef ALLBSD
        if(getifaddrs(&net) != 0){
                return NULL;
        }

        interfaces=0;
        
        for(net_ptr=net;net_ptr!=NULL;net_ptr=net_ptr->ifa_next){
                if(net_ptr->ifa_addr->sa_family != AF_LINK) continue;
                network_stats=network_stat_malloc((interfaces+1), &sizeof_network_stats, network_stats);
                if(network_stats==NULL){
                        return NULL;
                }
                network_stat_ptr=network_stats+interfaces;
                
                if(network_stat_ptr->interface_name!=NULL) free(network_stat_ptr->interface_name);
                network_stat_ptr->interface_name=strdup(net_ptr->ifa_name);
                if(network_stat_ptr->interface_name==NULL) return NULL;
                net_data=(struct if_data *)net_ptr->ifa_data;
                network_stat_ptr->rx=net_data->ifi_ibytes;
                network_stat_ptr->tx=net_data->ifi_obytes;                      
                network_stat_ptr->systime=time(NULL);
                interfaces++;
        }
        freeifaddrs(net);       
#endif

#ifdef SOLARIS
        if ((kc = kstat_open()) == NULL) {
                return NULL;
        }

        interfaces=0;

        for (ksp = kc->kc_chain; ksp; ksp = ksp->ks_next) {
                if (!strcmp(ksp->ks_class, "net")) {
                        kstat_read(kc, ksp, NULL);

#ifdef SOL7
#define RLOOKUP "rbytes"
#define WLOOKUP "obytes"
#define VALTYPE value.ui32
#else
#define RLOOKUP "rbytes64"
#define WLOOKUP "obytes64"
#define VALTYPE value.ui64
#endif

                        if((knp=kstat_data_lookup(ksp, RLOOKUP))==NULL){
                                /* Not a network interface, so skip to the next entry */
                                continue;
                        }

                        network_stats=network_stat_malloc((interfaces+1), &sizeof_network_stats, network_stats);
                        if(network_stats==NULL){
                                return NULL;
                        }
                        network_stat_ptr=network_stats+interfaces;
                        network_stat_ptr->rx=knp->VALTYPE;

                        if((knp=kstat_data_lookup(ksp, WLOOKUP))==NULL){
                                /* Not a network interface, so skip to the next entry */
                                continue;
                        }
                        network_stat_ptr->tx=knp->VALTYPE;
                        if(network_stat_ptr->interface_name!=NULL){
                                free(network_stat_ptr->interface_name);
                        }
                        network_stat_ptr->interface_name=strdup(ksp->ks_name);

                        network_stat_ptr->systime=time(NULL);
                        interfaces++;
                }
        }
                
        kstat_close(kc);        
#endif
#ifdef LINUX
        f=fopen("/proc/net/dev", "r");
        if(f==NULL){
                return NULL;
        }
        /* read the 2 lines.. Its the title, so we dont care :) */
        fgets(line, sizeof(line), f);
        fgets(line, sizeof(line), f);


        if((regcomp(&regex, "^[[:space:]]*([^:]+):[[:space:]]*([[:digit:]]+)[[:space:]]+[[:digit:]]+[[:space:]]+[[:digit:]]+[[:space:]]+[[:digit:]]+[[:space:]]+[[:digit:]]+[[:space:]]+[[:digit:]]+[[:space:]]+[[:digit:]]+[[:space:]]+[[:digit:]]+[[:space:]]+([[:digit:]]+)", REG_EXTENDED))!=0){
                return NULL;
        }

        interfaces=0;

        while((fgets(line, sizeof(line), f)) != NULL){
                if((regexec(&regex, line, 4, line_match, 0))!=0){
                        continue;
                }
                network_stats=network_stat_malloc((interfaces+1), &sizeof_network_stats, network_stats);
                if(network_stats==NULL){
                        return NULL;
                }
                network_stat_ptr=network_stats+interfaces;

                if(network_stat_ptr->interface_name!=NULL){
                        free(network_stat_ptr->interface_name);
                }

                network_stat_ptr->interface_name=get_string_match(line, &line_match[1]);
                network_stat_ptr->rx=get_ll_match(line, &line_match[2]);
                network_stat_ptr->tx=get_ll_match(line, &line_match[3]);
                network_stat_ptr->systime=time(NULL);

                interfaces++;
        }
        fclose(f);
        regfree(&regex);

#endif

#ifdef CYGWIN
        return NULL;
#endif

        *entries=interfaces;

        return network_stats;   
}

long long transfer_diff(long long new, long long old){
#if defined(SOL7) || defined(LINUX) || defined(FREEBSD)
#define MAXVAL 4294967296LL
#else
#define MAXVAL 18446744073709551616LL
#endif
        long long result;
        if(new>=old){
                result = (new-old);
        }else{
                result = (MAXVAL+(new-old));
        }

        return result;

}

network_stat_t *get_network_stats_diff(int *entries) {
        static network_stat_t *diff = NULL;
        static int diff_count = 0;
        network_stat_t *src, *dest;
        int i, j, new_count;

        if (network_stats == NULL) {
                /* No previous stats, so we can't calculate a difference. */
                return get_network_stats(entries);
        }

        /* Resize the results array to match the previous stats. */
        diff = network_stat_malloc(interfaces, &diff_count, diff);
        if (diff == NULL) {
                return NULL;
        }

        /* Copy the previous stats into the result. */
        for (i = 0; i < diff_count; i++) {
                src = &network_stats[i];
                dest = &diff[i];

                if (dest->interface_name != NULL) {
                        free(dest->interface_name);
                }
                dest->interface_name = strdup(src->interface_name);
                dest->rx = src->rx;
                dest->tx = src->tx;
                dest->systime = src->systime;
        }

        /* Get a new set of stats. */
        if (get_network_stats(&new_count) == NULL) {
                return NULL;
        }

        /* For each previous stat... */
        for (i = 0; i < diff_count; i++) {
                dest = &diff[i];

                /* ... find the corresponding new stat ... */
                for (j = 0; j < new_count; j++) {
                        /* Try the new stat in the same position first,
                           since that's most likely to be it. */
                        src = &network_stats[(i + j) % new_count];
                        if (strcmp(src->interface_name, dest->interface_name) == 0) {
                                break;
                        }
                }
                if (j == new_count) {
                        /* No match found. */
                        continue;
                }

                /* ... and subtract the previous stat from it to get the
                   difference. */
                dest->rx = transfer_diff(src->rx, dest->rx);
                dest->tx = transfer_diff(src->tx, dest->tx);
                dest->systime = src->systime - dest->systime;
        }

        *entries = diff_count;
        return diff;
}
/* NETWORK INTERFACE STATS */

void network_iface_stat_init(int start, int end, network_iface_stat_t *net_stats){

        for(net_stats+=start; start<end; start++){
                net_stats->interface_name=NULL;
                net_stats->speed=0;
                net_stats->dup=NO_DUPLEX;
                net_stats++;
        }
}

network_iface_stat_t *network_iface_stat_malloc(int needed_entries, int *cur_entries, network_iface_stat_t *net_stats){

        if(net_stats==NULL){

                if((net_stats=malloc(needed_entries * sizeof(network_iface_stat_t)))==NULL){
                        return NULL;
                }
                network_iface_stat_init(0, needed_entries, net_stats);
                *cur_entries=needed_entries;

                return net_stats;
        }


        if(*cur_entries<needed_entries){
                net_stats=realloc(net_stats, (sizeof(network_iface_stat_t)*needed_entries));
                if(net_stats==NULL){
                        return NULL;
                }
                network_iface_stat_init(*cur_entries, needed_entries, net_stats);
                *cur_entries=needed_entries;
        }

        return net_stats;
}

network_iface_stat_t *get_network_iface_stats(int *entries){
        static network_iface_stat_t *network_iface_stats;
        network_iface_stat_t *network_iface_stat_ptr;
        static int sizeof_network_iface_stats=0;        
        static int ifaces;

#ifdef SOLARIS
        kstat_ctl_t *kc;
        kstat_t *ksp;
        kstat_named_t *knp;
#endif
#ifdef ALLBSD
        struct ifaddrs *net, *net_ptr;
        struct ifmediareq ifmed;
        int s;
        int x;
#endif

        ifaces = 0;
#ifdef ALLBSD
        if(getifaddrs(&net) != 0){
                return NULL;
        }

        if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == NULL) return NULL;

        for(net_ptr=net; net_ptr!=NULL; net_ptr=net_ptr->ifa_next){
                if(net_ptr->ifa_addr->sa_family != AF_LINK) continue;
                network_iface_stats=network_iface_stat_malloc((ifaces+1), &sizeof_network_iface_stats, network_iface_stats);
                if(network_iface_stats==NULL){
                        return NULL;
                }
                network_iface_stat_ptr = network_iface_stats + ifaces;

                memset(&ifmed, 0, sizeof(struct ifmediareq));
                strlcpy(ifmed.ifm_name, net_ptr->ifa_name, sizeof(ifmed.ifm_name));
                if(ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmed) == -1){
                        continue;
                }

                /* We may need to change this if we start doing wireless devices too */
                if( (ifmed.ifm_active | IFM_ETHER) != ifmed.ifm_active ){
                        /* Not a ETHER device */
                        continue;
                }

                if(network_iface_stat_ptr->interface_name != NULL) free(network_iface_stat_ptr->interface_name);
                network_iface_stat_ptr->interface_name = strdup(net_ptr->ifa_name);
                if(network_iface_stat_ptr->interface_name == NULL) return NULL;

                /* Only intrested in the first 4 bits)  - Assuming only ETHER devices */
                x = ifmed.ifm_active & 0x0f;    
                switch(x){
                        /* 10 Mbit connections. Speedy :) */
                        case(IFM_10_T):
                        case(IFM_10_2):
                        case(IFM_10_5):
                        case(IFM_10_STP):
                        case(IFM_10_FL):
                                network_iface_stat_ptr->speed = 10;
                                break;
                        /* 100 Mbit conneections */
                        case(IFM_100_TX):
                        case(IFM_100_FX):
                        case(IFM_100_T4):
                        case(IFM_100_VG):
                        case(IFM_100_T2):
                                network_iface_stat_ptr->speed = 100;
                                break;
                        /* 1000 Mbit connections */
                        case(IFM_1000_SX):
                        case(IFM_1000_LX):
                        case(IFM_1000_CX):
                        case(IFM_1000_TX):
                                network_iface_stat_ptr->speed = 1000;
                                break;
                        /* We don't know what it is */
                        default:
                                network_iface_stat_ptr->speed = 0;
                                break;
                }

                if( (ifmed.ifm_active | IFM_FDX) == ifmed.ifm_active ){
                        network_iface_stat_ptr->dup = FULL_DUPLEX;
                }else if( (ifmed.ifm_active | IFM_HDX) == ifmed.ifm_active ){
                        network_iface_stat_ptr->dup = HALF_DUPLEX;
                }else{
                        network_iface_stat_ptr->dup = NO_DUPLEX;
                }
                ifaces++;
        }       
        freeifaddrs(net);
#endif

#ifdef SOLARIS
        if ((kc = kstat_open()) == NULL) {
                return NULL;
        }

        for (ksp = kc->kc_chain; ksp; ksp = ksp->ks_next) {
                if (!strcmp(ksp->ks_class, "net")) {
                        kstat_read(kc, ksp, NULL);
                        if((knp=kstat_data_lookup(ksp, "ifspeed"))==NULL){
                                /* Not a network interface, so skip to the next entry */
                                continue;
                        }
                        network_iface_stats=network_iface_stat_malloc((ifaces+1), &sizeof_network_iface_stats, network_iface_stats);
                        if(network_iface_stats==NULL){
                                return NULL;
                        }
                        network_iface_stat_ptr = network_iface_stats + ifaces;
                        network_iface_stat_ptr->speed = knp->value.ui64 / (1000*1000);

                        if((knp=kstat_data_lookup(ksp, "link_duplex"))==NULL){
                                /* Not a network interface, so skip to the next entry */
                                continue;
                        }

                        if(knp->value.ui64 == 0){
                                network_iface_stat_ptr->dup = FULL_DUPLEX;
                        }else{
                                network_iface_stat_ptr->dup = HALF_DUPLEX;
                        }

                        if(network_iface_stat_ptr->interface_name != NULL) free(network_iface_stat_ptr->interface_name);
                        network_iface_stat_ptr->interface_name = strdup(ksp->ks_name);
                        if(network_iface_stat_ptr->interface_name == NULL) return NULL;
                        ifaces++;
                }
        }
        kstat_close(kc);
        
#endif  
        *entries = ifaces;
        return network_iface_stats; 
}

Revision:	1.26
Committed:	Sun Jan 25 20:13:57 2004 UTC (20 years, 3 months ago) by pajs
Content type:	text/plain
Branch:	MAIN
Changes since 1.25:	+91 -7 lines
Log Message:	Added code for freebsd to do the network interface speeds. I've put it under the label ALLBSD however, as i suspect it will work on all the BSD's of intrest.
#	Content
1	/*
2	* i-scream central monitoring system
3	* http://www.i-scream.org
4	* Copyright (C) 2000-2004 i-scream
5	*
6	* This library is free software; you can redistribute it and/or
7	* modify it under the terms of the GNU Lesser General Public
8	* License as published by the Free Software Foundation; either
9	* version 2.1 of the License, or (at your option) any later version.
10	*
11	* This library is distributed in the hope that it will be useful,
12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14	* Lesser General Public License for more details.
15	*
16	* You should have received a copy of the GNU Lesser General Public
17	* License along with this library; if not, write to the Free Software
18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19	* 02111-1307 USA
20	*
21	* $Id: network_stats.c,v 1.25 2004/01/23 23:23:33 pajs Exp $
22	*/
23
24	#ifdef HAVE_CONFIG_H
25	#include "config.h"
26	#endif
27
28	#include <stdlib.h>
29	#include <string.h>
30	#include "statgrab.h"
31	#include <time.h>
32	#ifdef SOLARIS
33	#include <kstat.h>
34	#include <sys/sysinfo.h>
35	#endif
36	#ifdef LINUX
37	#include <stdio.h>
38	#include <sys/types.h>
39	#include <regex.h>
40	#include "tools.h"
41	#endif
42	#ifdef ALLBSD
43	#include <sys/types.h>
44	#include <sys/socket.h>
45	#include <ifaddrs.h>
46	#include <net/if.h>
47	#include <net/if_media.h>
48	#include <sys/ioctl.h>
49	#endif
50
51	static network_stat_t *network_stats=NULL;
52	static int interfaces=0;
53
54	void network_stat_init(int start, int end, network_stat_t *net_stats){
55
56	for(net_stats+=start; start<end; start++){
57	net_stats->interface_name=NULL;
58	net_stats->tx=0;
59	net_stats->rx=0;
60	net_stats++;
61	}
62	}
63
64	network_stat_t network_stat_malloc(int needed_entries, int cur_entries, network_stat_t *net_stats){
65
66	if(net_stats==NULL){
67
68	if((net_stats=malloc(needed_entries * sizeof(network_stat_t)))==NULL){
69	return NULL;
70	}
71	network_stat_init(0, needed_entries, net_stats);
72	*cur_entries=needed_entries;
73
74	return net_stats;
75	}
76
77
78	if(*cur_entries<needed_entries){
79	net_stats=realloc(net_stats, (sizeof(network_stat_t)*needed_entries));
80	if(net_stats==NULL){
81	return NULL;
82	}
83	network_stat_init(*cur_entries, needed_entries, net_stats);
84	*cur_entries=needed_entries;
85	}
86
87	return net_stats;
88	}
89
90
91	network_stat_t get_network_stats(int entries){
92
93	static int sizeof_network_stats=0;
94	network_stat_t *network_stat_ptr;
95
96	#ifdef SOLARIS
97	kstat_ctl_t *kc;
98	kstat_t *ksp;
99	kstat_named_t *knp;
100	#endif
101
102	#ifdef LINUX
103	FILE *f;
104	/* Horrible big enough, but it should be easily big enough */
105	char line[8096];
106	regex_t regex;
107	regmatch_t line_match[4];
108	#endif
109	#ifdef ALLBSD
110	struct ifaddrs net, net_ptr;
111	struct if_data *net_data;
112	#endif
113
114	#ifdef ALLBSD
115	if(getifaddrs(&net) != 0){
116	return NULL;
117	}
118
119	interfaces=0;
120
121	for(net_ptr=net;net_ptr!=NULL;net_ptr=net_ptr->ifa_next){
122	if(net_ptr->ifa_addr->sa_family != AF_LINK) continue;
123	network_stats=network_stat_malloc((interfaces+1), &sizeof_network_stats, network_stats);
124	if(network_stats==NULL){
125	return NULL;
126	}
127	network_stat_ptr=network_stats+interfaces;
128
129	if(network_stat_ptr->interface_name!=NULL) free(network_stat_ptr->interface_name);
130	network_stat_ptr->interface_name=strdup(net_ptr->ifa_name);
131	if(network_stat_ptr->interface_name==NULL) return NULL;
132	net_data=(struct if_data *)net_ptr->ifa_data;
133	network_stat_ptr->rx=net_data->ifi_ibytes;
134	network_stat_ptr->tx=net_data->ifi_obytes;
135	network_stat_ptr->systime=time(NULL);
136	interfaces++;
137	}
138	freeifaddrs(net);
139	#endif
140
141	#ifdef SOLARIS
142	if ((kc = kstat_open()) == NULL) {
143	return NULL;
144	}
145
146	interfaces=0;
147
148	for (ksp = kc->kc_chain; ksp; ksp = ksp->ks_next) {
149	if (!strcmp(ksp->ks_class, "net")) {
150	kstat_read(kc, ksp, NULL);
151
152	#ifdef SOL7
153	#define RLOOKUP "rbytes"
154	#define WLOOKUP "obytes"
155	#define VALTYPE value.ui32
156	#else
157	#define RLOOKUP "rbytes64"
158	#define WLOOKUP "obytes64"
159	#define VALTYPE value.ui64
160	#endif
161
162	if((knp=kstat_data_lookup(ksp, RLOOKUP))==NULL){
163	/* Not a network interface, so skip to the next entry */
164	continue;
165	}
166
167	network_stats=network_stat_malloc((interfaces+1), &sizeof_network_stats, network_stats);
168	if(network_stats==NULL){
169	return NULL;
170	}
171	network_stat_ptr=network_stats+interfaces;
172	network_stat_ptr->rx=knp->VALTYPE;
173
174	if((knp=kstat_data_lookup(ksp, WLOOKUP))==NULL){
175	/* Not a network interface, so skip to the next entry */
176	continue;
177	}
178	network_stat_ptr->tx=knp->VALTYPE;
179	if(network_stat_ptr->interface_name!=NULL){
180	free(network_stat_ptr->interface_name);
181	}
182	network_stat_ptr->interface_name=strdup(ksp->ks_name);
183
184	network_stat_ptr->systime=time(NULL);
185	interfaces++;
186	}
187	}
188
189	kstat_close(kc);
190	#endif
191	#ifdef LINUX
192	f=fopen("/proc/net/dev", "r");
193	if(f==NULL){
194	return NULL;
195	}
196	/* read the 2 lines.. Its the title, so we dont care :) */
197	fgets(line, sizeof(line), f);
198	fgets(line, sizeof(line), f);
199
200
201	if((regcomp(&regex, "^[[:space:]]([^:]+):[[:space:]]([[:digit:]]+)[[:space:]]+[[:digit:]]+[[:space:]]+[[:digit:]]+[[:space:]]+[[:digit:]]+[[:space:]]+[[:digit:]]+[[:space:]]+[[:digit:]]+[[:space:]]+[[:digit:]]+[[:space:]]+[[:digit:]]+[[:space:]]+([[:digit:]]+)", REG_EXTENDED))!=0){
202	return NULL;
203	}
204
205	interfaces=0;
206
207	while((fgets(line, sizeof(line), f)) != NULL){
208	if((regexec(&regex, line, 4, line_match, 0))!=0){
209	continue;
210	}
211	network_stats=network_stat_malloc((interfaces+1), &sizeof_network_stats, network_stats);
212	if(network_stats==NULL){
213	return NULL;
214	}
215	network_stat_ptr=network_stats+interfaces;
216
217	if(network_stat_ptr->interface_name!=NULL){
218	free(network_stat_ptr->interface_name);
219	}
220
221	network_stat_ptr->interface_name=get_string_match(line, &line_match[1]);
222	network_stat_ptr->rx=get_ll_match(line, &line_match[2]);
223	network_stat_ptr->tx=get_ll_match(line, &line_match[3]);
224	network_stat_ptr->systime=time(NULL);
225
226	interfaces++;
227	}
228	fclose(f);
229	regfree(&regex);
230
231	#endif
232
233	#ifdef CYGWIN
234	return NULL;
235	#endif
236
237	*entries=interfaces;
238
239	return network_stats;
240	}
241
242	long long transfer_diff(long long new, long long old){
243	#if defined(SOL7) \|\| defined(LINUX) \|\| defined(FREEBSD)
244	#define MAXVAL 4294967296LL
245	#else
246	#define MAXVAL 18446744073709551616LL
247	#endif
248	long long result;
249	if(new>=old){
250	result = (new-old);
251	}else{
252	result = (MAXVAL+(new-old));
253	}
254
255	return result;
256
257	}
258
259	network_stat_t get_network_stats_diff(int entries) {
260	static network_stat_t *diff = NULL;
261	static int diff_count = 0;
262	network_stat_t src, dest;
263	int i, j, new_count;
264
265	if (network_stats == NULL) {
266	/* No previous stats, so we can't calculate a difference. */
267	return get_network_stats(entries);
268	}
269
270	/* Resize the results array to match the previous stats. */
271	diff = network_stat_malloc(interfaces, &diff_count, diff);
272	if (diff == NULL) {
273	return NULL;
274	}
275
276	/* Copy the previous stats into the result. */
277	for (i = 0; i < diff_count; i++) {
278	src = &network_stats[i];
279	dest = &diff[i];
280
281	if (dest->interface_name != NULL) {
282	free(dest->interface_name);
283	}
284	dest->interface_name = strdup(src->interface_name);
285	dest->rx = src->rx;
286	dest->tx = src->tx;
287	dest->systime = src->systime;
288	}
289
290	/* Get a new set of stats. */
291	if (get_network_stats(&new_count) == NULL) {
292	return NULL;
293	}
294
295	/* For each previous stat... */
296	for (i = 0; i < diff_count; i++) {
297	dest = &diff[i];
298
299	/* ... find the corresponding new stat ... */
300	for (j = 0; j < new_count; j++) {
301	/* Try the new stat in the same position first,
302	since that's most likely to be it. */
303	src = &network_stats[(i + j) % new_count];
304	if (strcmp(src->interface_name, dest->interface_name) == 0) {
305	break;
306	}
307	}
308	if (j == new_count) {
309	/* No match found. */
310	continue;
311	}
312
313	/* ... and subtract the previous stat from it to get the
314	difference. */
315	dest->rx = transfer_diff(src->rx, dest->rx);
316	dest->tx = transfer_diff(src->tx, dest->tx);
317	dest->systime = src->systime - dest->systime;
318	}
319
320	*entries = diff_count;
321	return diff;
322	}
323	/* NETWORK INTERFACE STATS */
324
325	void network_iface_stat_init(int start, int end, network_iface_stat_t *net_stats){
326
327	for(net_stats+=start; start<end; start++){
328	net_stats->interface_name=NULL;
329	net_stats->speed=0;
330	net_stats->dup=NO_DUPLEX;
331	net_stats++;
332	}
333	}
334
335	network_iface_stat_t network_iface_stat_malloc(int needed_entries, int cur_entries, network_iface_stat_t *net_stats){
336
337	if(net_stats==NULL){
338
339	if((net_stats=malloc(needed_entries * sizeof(network_iface_stat_t)))==NULL){
340	return NULL;
341	}
342	network_iface_stat_init(0, needed_entries, net_stats);
343	*cur_entries=needed_entries;
344
345	return net_stats;
346	}
347
348
349	if(*cur_entries<needed_entries){
350	net_stats=realloc(net_stats, (sizeof(network_iface_stat_t)*needed_entries));
351	if(net_stats==NULL){
352	return NULL;
353	}
354	network_iface_stat_init(*cur_entries, needed_entries, net_stats);
355	*cur_entries=needed_entries;
356	}
357
358	return net_stats;
359	}
360
361	network_iface_stat_t get_network_iface_stats(int entries){
362	static network_iface_stat_t *network_iface_stats;
363	network_iface_stat_t *network_iface_stat_ptr;
364	static int sizeof_network_iface_stats=0;
365	static int ifaces;
366
367	#ifdef SOLARIS
368	kstat_ctl_t *kc;
369	kstat_t *ksp;
370	kstat_named_t *knp;
371	#endif
372	#ifdef ALLBSD
373	struct ifaddrs net, net_ptr;
374	struct ifmediareq ifmed;
375	int s;
376	int x;
377	#endif
378
379	ifaces = 0;
380	#ifdef ALLBSD
381	if(getifaddrs(&net) != 0){
382	return NULL;
383	}
384
385	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == NULL) return NULL;
386
387	for(net_ptr=net; net_ptr!=NULL; net_ptr=net_ptr->ifa_next){
388	if(net_ptr->ifa_addr->sa_family != AF_LINK) continue;
389	network_iface_stats=network_iface_stat_malloc((ifaces+1), &sizeof_network_iface_stats, network_iface_stats);
390	if(network_iface_stats==NULL){
391	return NULL;
392	}
393	network_iface_stat_ptr = network_iface_stats + ifaces;
394
395	memset(&ifmed, 0, sizeof(struct ifmediareq));
396	strlcpy(ifmed.ifm_name, net_ptr->ifa_name, sizeof(ifmed.ifm_name));
397	if(ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmed) == -1){
398	continue;
399	}
400
401	/* We may need to change this if we start doing wireless devices too */
402	if( (ifmed.ifm_active \| IFM_ETHER) != ifmed.ifm_active ){
403	/* Not a ETHER device */
404	continue;
405	}
406
407	if(network_iface_stat_ptr->interface_name != NULL) free(network_iface_stat_ptr->interface_name);
408	network_iface_stat_ptr->interface_name = strdup(net_ptr->ifa_name);
409	if(network_iface_stat_ptr->interface_name == NULL) return NULL;
410
411	/* Only intrested in the first 4 bits) - Assuming only ETHER devices */
412	x = ifmed.ifm_active & 0x0f;
413	switch(x){
414	/* 10 Mbit connections. Speedy :) */
415	case(IFM_10_T):
416	case(IFM_10_2):
417	case(IFM_10_5):
418	case(IFM_10_STP):
419	case(IFM_10_FL):
420	network_iface_stat_ptr->speed = 10;
421	break;
422	/* 100 Mbit conneections */
423	case(IFM_100_TX):
424	case(IFM_100_FX):
425	case(IFM_100_T4):
426	case(IFM_100_VG):
427	case(IFM_100_T2):
428	network_iface_stat_ptr->speed = 100;
429	break;
430	/* 1000 Mbit connections */
431	case(IFM_1000_SX):
432	case(IFM_1000_LX):
433	case(IFM_1000_CX):
434	case(IFM_1000_TX):
435	network_iface_stat_ptr->speed = 1000;
436	break;
437	/* We don't know what it is */
438	default:
439	network_iface_stat_ptr->speed = 0;
440	break;
441	}
442
443	if( (ifmed.ifm_active \| IFM_FDX) == ifmed.ifm_active ){
444	network_iface_stat_ptr->dup = FULL_DUPLEX;
445	}else if( (ifmed.ifm_active \| IFM_HDX) == ifmed.ifm_active ){
446	network_iface_stat_ptr->dup = HALF_DUPLEX;
447	}else{
448	network_iface_stat_ptr->dup = NO_DUPLEX;
449	}
450	ifaces++;
451	}
452	freeifaddrs(net);
453	#endif
454
455	#ifdef SOLARIS
456	if ((kc = kstat_open()) == NULL) {
457	return NULL;
458	}
459
460	for (ksp = kc->kc_chain; ksp; ksp = ksp->ks_next) {
461	if (!strcmp(ksp->ks_class, "net")) {
462	kstat_read(kc, ksp, NULL);
463	if((knp=kstat_data_lookup(ksp, "ifspeed"))==NULL){
464	/* Not a network interface, so skip to the next entry */
465	continue;
466	}
467	network_iface_stats=network_iface_stat_malloc((ifaces+1), &sizeof_network_iface_stats, network_iface_stats);
468	if(network_iface_stats==NULL){
469	return NULL;
470	}
471	network_iface_stat_ptr = network_iface_stats + ifaces;
472	network_iface_stat_ptr->speed = knp->value.ui64 / (1000*1000);
473
474	if((knp=kstat_data_lookup(ksp, "link_duplex"))==NULL){
475	/* Not a network interface, so skip to the next entry */
476	continue;
477	}
478
479	if(knp->value.ui64 == 0){
480	network_iface_stat_ptr->dup = FULL_DUPLEX;
481	}else{
482	network_iface_stat_ptr->dup = HALF_DUPLEX;
483	}
484
485	if(network_iface_stat_ptr->interface_name != NULL) free(network_iface_stat_ptr->interface_name);
486	network_iface_stat_ptr->interface_name = strdup(ksp->ks_name);
487	if(network_iface_stat_ptr->interface_name == NULL) return NULL;
488	ifaces++;
489	}
490	}
491	kstat_close(kc);
492
493	#endif
494	*entries = ifaces;
495	return network_iface_stats;
496	}
497