Fri Jul 24 00:40:59 2009

Asterisk developer's documentation


netsock.c

Go to the documentation of this file.
00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * Copyright (C) 1999 - 2005, Digium, Inc.
00005  *
00006  * Kevin P. Fleming <kpfleming@digium.com>
00007  * Mark Spencer <markster@digium.com>
00008  *
00009  * See http://www.asterisk.org for more information about
00010  * the Asterisk project. Please do not directly contact
00011  * any of the maintainers of this project for assistance;
00012  * the project provides a web site, mailing lists and IRC
00013  * channels for your use.
00014  *
00015  * This program is free software, distributed under the terms of
00016  * the GNU General Public License Version 2. See the LICENSE file
00017  * at the top of the source tree.
00018  */
00019 
00020 /*! \file
00021  *
00022  * \brief Network socket handling
00023  *
00024  * \author Kevin P. Fleming <kpfleming@digium.com>
00025  * \author Mark Spencer <markster@digium.com>
00026  */
00027 
00028 #include "asterisk.h"
00029 
00030 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 124102 $")
00031 
00032 #if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__Darwin__)
00033 #include <net/if_dl.h>
00034 #endif
00035 
00036 #if defined (SOLARIS)
00037 #include <sys/sockio.h>
00038 #elif defined(HAVE_GETIFADDRS)
00039 #include <ifaddrs.h>
00040 #endif
00041 
00042 #include "asterisk/netsock.h"
00043 #include "asterisk/utils.h"
00044 #include "asterisk/astobj.h"
00045 
00046 struct ast_netsock {
00047    ASTOBJ_COMPONENTS(struct ast_netsock);
00048    struct sockaddr_in bindaddr;
00049    int sockfd;
00050    int *ioref;
00051    struct io_context *ioc;
00052    void *data;
00053 };
00054 
00055 struct ast_netsock_list {
00056    ASTOBJ_CONTAINER_COMPONENTS(struct ast_netsock);
00057    struct io_context *ioc;
00058 };
00059 
00060 static void ast_netsock_destroy(struct ast_netsock *netsock)
00061 {
00062    ast_io_remove(netsock->ioc, netsock->ioref);
00063    close(netsock->sockfd);
00064    ast_free(netsock);
00065 }
00066 
00067 struct ast_netsock_list *ast_netsock_list_alloc(void)
00068 {
00069    return ast_calloc(1, sizeof(struct ast_netsock_list));
00070 }
00071 
00072 int ast_netsock_init(struct ast_netsock_list *list)
00073 {
00074    memset(list, 0, sizeof(*list));
00075    ASTOBJ_CONTAINER_INIT(list);
00076 
00077    return 0;
00078 }
00079 
00080 int ast_netsock_release(struct ast_netsock_list *list)
00081 {
00082    ASTOBJ_CONTAINER_DESTROYALL(list, ast_netsock_destroy);
00083    ASTOBJ_CONTAINER_DESTROY(list);
00084 
00085    return 0;
00086 }
00087 
00088 struct ast_netsock *ast_netsock_find(struct ast_netsock_list *list,
00089                  struct sockaddr_in *sa)
00090 {
00091    struct ast_netsock *sock = NULL;
00092 
00093    ASTOBJ_CONTAINER_TRAVERSE(list, !sock, {
00094       ASTOBJ_RDLOCK(iterator);
00095       if (!inaddrcmp(&iterator->bindaddr, sa))
00096          sock = iterator;
00097       ASTOBJ_UNLOCK(iterator);
00098    });
00099 
00100    return sock;
00101 }
00102 
00103 struct ast_netsock *ast_netsock_bindaddr(struct ast_netsock_list *list, struct io_context *ioc, struct sockaddr_in *bindaddr, int tos, int cos, ast_io_cb callback, void *data)
00104 {
00105    int netsocket = -1;
00106    int *ioref;
00107    
00108    struct ast_netsock *ns;
00109    const int reuseFlag = 1;
00110    
00111    /* Make a UDP socket */
00112    netsocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
00113    
00114    if (netsocket < 0) {
00115       ast_log(LOG_ERROR, "Unable to create network socket: %s\n", strerror(errno));
00116       return NULL;
00117    }
00118    if (setsockopt(netsocket, SOL_SOCKET, SO_REUSEADDR, (char *)&reuseFlag, sizeof reuseFlag) < 0) {
00119          ast_log(LOG_WARNING, "Error setting SO_REUSEADDR on sockfd '%d'\n", netsocket);
00120    }
00121    if (bind(netsocket,(struct sockaddr *)bindaddr, sizeof(struct sockaddr_in))) {
00122       ast_log(LOG_ERROR, "Unable to bind to %s port %d: %s\n", ast_inet_ntoa(bindaddr->sin_addr), ntohs(bindaddr->sin_port), strerror(errno));
00123       close(netsocket);
00124       return NULL;
00125    }
00126 
00127    ast_netsock_set_qos(netsocket, tos, cos, "IAX2");
00128       
00129    ast_enable_packet_fragmentation(netsocket);
00130 
00131    if (!(ns = ast_calloc(1, sizeof(*ns)))) {
00132       close(netsocket);
00133       return NULL;
00134    }
00135    
00136    /* Establish I/O callback for socket read */
00137    if (!(ioref = ast_io_add(ioc, netsocket, callback, AST_IO_IN, ns))) {
00138       close(netsocket);
00139       ast_free(ns);
00140       return NULL;
00141    }  
00142    ASTOBJ_INIT(ns);
00143    ns->ioref = ioref;
00144    ns->ioc = ioc;
00145    ns->sockfd = netsocket;
00146    ns->data = data;
00147    memcpy(&ns->bindaddr, bindaddr, sizeof(ns->bindaddr));
00148    ASTOBJ_CONTAINER_LINK(list, ns);
00149 
00150    return ns;
00151 }
00152 
00153 int ast_netsock_set_qos(int netsocket, int tos, int cos, const char *desc)
00154 {
00155    int res;
00156    
00157    if ((res = setsockopt(netsocket, IPPROTO_IP, IP_TOS, &tos, sizeof(tos))))
00158       ast_log(LOG_WARNING, "Unable to set %s TOS to %d, may be you have no root privileges\n", desc, tos);
00159    else if (tos)
00160       ast_verb(2, "Using %s TOS bits %d\n", desc, tos);
00161 
00162 #if defined(linux)                        
00163    if (setsockopt(netsocket, SOL_SOCKET, SO_PRIORITY, &cos, sizeof(cos)))
00164       ast_log(LOG_WARNING, "Unable to set %s CoS to %d\n", desc, cos);
00165    else if (cos)
00166       ast_verb(2, "Using %s CoS mark %d\n", desc, cos);
00167 #endif
00168                      
00169    return res;
00170 }
00171                                        
00172 
00173 struct ast_netsock *ast_netsock_bind(struct ast_netsock_list *list, struct io_context *ioc, const char *bindinfo, int defaultport, int tos, int cos, ast_io_cb callback, void *data)
00174 {
00175    struct sockaddr_in sin;
00176    char *tmp;
00177    char *host;
00178    char *port;
00179    int portno;
00180 
00181    memset(&sin, 0, sizeof(sin));
00182    sin.sin_family = AF_INET;
00183    sin.sin_port = htons(defaultport);
00184    tmp = ast_strdupa(bindinfo);
00185 
00186    host = strsep(&tmp, ":");
00187    port = tmp;
00188 
00189    if (port && ((portno = atoi(port)) > 0))
00190       sin.sin_port = htons(portno);
00191 
00192    inet_aton(host, &sin.sin_addr);
00193 
00194    return ast_netsock_bindaddr(list, ioc, &sin, tos, cos, callback, data);
00195 }
00196 
00197 int ast_netsock_sockfd(const struct ast_netsock *ns)
00198 {
00199    return ns ? ns-> sockfd : -1;
00200 }
00201 
00202 const struct sockaddr_in *ast_netsock_boundaddr(const struct ast_netsock *ns)
00203 {
00204    return &(ns->bindaddr);
00205 }
00206 
00207 void *ast_netsock_data(const struct ast_netsock *ns)
00208 {
00209    return ns->data;
00210 }
00211 
00212 void ast_netsock_unref(struct ast_netsock *ns)
00213 {
00214    ASTOBJ_UNREF(ns, ast_netsock_destroy);
00215 }
00216 
00217 char *ast_eid_to_str(char *s, int maxlen, struct ast_eid *eid)
00218 {
00219    int x;
00220    char *os = s;
00221    if (maxlen < 18) {
00222       if (s && (maxlen > 0))
00223          *s = '\0';
00224    } else {
00225       for (x = 0; x < 5; x++) {
00226          sprintf(s, "%02x:", eid->eid[x]);
00227          s += 3;
00228       }
00229       sprintf(s, "%02x", eid->eid[5]);
00230    }
00231    return os;
00232 }
00233 
00234 void ast_set_default_eid(struct ast_eid *eid)
00235 {
00236 #if defined(SIOCGIFHWADDR)
00237    int s, x = 0;
00238    char eid_str[20];
00239    struct ifreq ifr;
00240 
00241    s = socket(AF_INET, SOCK_STREAM, 0);
00242    if (s < 0)
00243       return;
00244    for (x = 0; x < 10; x++) {
00245       memset(&ifr, 0, sizeof(ifr));
00246       snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "eth%d", x);
00247       if (ioctl(s, SIOCGIFHWADDR, &ifr))
00248          continue;
00249       memcpy(eid, ((unsigned char *)&ifr.ifr_hwaddr) + 2, sizeof(*eid));
00250       ast_debug(1, "Seeding global EID '%s' from '%s' using 'siocgifhwaddr'\n", ast_eid_to_str(eid_str, sizeof(eid_str), eid), ifr.ifr_name);
00251       close(s);
00252       return;
00253    }
00254    close(s);
00255 #else
00256 #if defined(ifa_broadaddr) && !defined(SOLARIS)
00257    char eid_str[20];
00258    struct ifaddrs *ifap;
00259    
00260    if (getifaddrs(&ifap) == 0) {
00261       struct ifaddrs *p;
00262       for (p = ifap; p; p = p->ifa_next) {
00263          if ((p->ifa_addr->sa_family == AF_LINK) && !(p->ifa_flags & IFF_LOOPBACK) && (p->ifa_flags & IFF_RUNNING)) {
00264             struct sockaddr_dl* sdp = (struct sockaddr_dl*) p->ifa_addr;
00265             memcpy(&(eid->eid), sdp->sdl_data + sdp->sdl_nlen, 6);
00266             ast_debug(1, "Seeding global EID '%s' from '%s' using 'getifaddrs'\n", ast_eid_to_str(eid_str, sizeof(eid_str), eid), p->ifa_name);
00267             freeifaddrs(ifap);
00268             return;
00269          }
00270       }
00271       freeifaddrs(ifap);
00272    }
00273 #endif
00274 #endif
00275    ast_debug(1, "No ethernet interface found for seeding global EID. You will have to set it manually.\n");
00276 }
00277 
00278 int ast_str_to_eid(struct ast_eid *eid, const char *s)
00279 {
00280    unsigned int eid_int[6];
00281    int x;
00282 
00283    if (sscanf(s, "%x:%x:%x:%x:%x:%x", &eid_int[0], &eid_int[1], &eid_int[2],
00284        &eid_int[3], &eid_int[4], &eid_int[5]) != 6)
00285          return -1;
00286    
00287    for (x = 0; x < 6; x++)
00288       eid->eid[x] = eid_int[x];
00289 
00290    return 0;
00291 }
00292 
00293 int ast_eid_cmp(const struct ast_eid *eid1, const struct ast_eid *eid2)
00294 {
00295    return memcmp(eid1, eid2, sizeof(*eid1));
00296 }

Generated on Fri Jul 24 00:40:59 2009 for Asterisk - the Open Source PBX by  doxygen 1.4.7