Wed Oct 28 15:47:56 2009

Asterisk developer's documentation


acl.h File Reference

Access Control of various sorts. More...

#include <netinet/in.h>
#include "asterisk/io.h"

Include dependency graph for acl.h:

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Data Structures

struct  ast_ha

Defines

#define AST_SENSE_ALLOW   1
#define AST_SENSE_DENY   0

Functions

struct ast_haast_append_ha (char *sense, const char *stuff, struct ast_ha *path)
int ast_apply_ha (struct ast_ha *ha, struct sockaddr_in *sin)
void ast_copy_ha (const struct ast_ha *from, struct ast_ha *to)
struct ast_haast_duplicate_ha_list (struct ast_ha *original)
int ast_find_ourip (struct in_addr *ourip, struct sockaddr_in bindaddr)
void ast_free_ha (struct ast_ha *ha)
int ast_get_ip (struct sockaddr_in *sin, const char *value)
int ast_get_ip_or_srv (struct sockaddr_in *sin, const char *value, const char *service)
int ast_lookup_iface (char *iface, struct in_addr *address)
int ast_ouraddrfor (struct in_addr *them, struct in_addr *us)
int ast_str2tos (const char *value, int *tos)


Detailed Description

Access Control of various sorts.

Definition in file acl.h.


Define Documentation

#define AST_SENSE_ALLOW   1

Definition at line 35 of file acl.h.

Referenced by ast_append_ha(), and ast_apply_ha().

#define AST_SENSE_DENY   0

Definition at line 34 of file acl.h.

Referenced by ast_append_ha().


Function Documentation

struct ast_ha* ast_append_ha ( char *  sense,
const char *  stuff,
struct ast_ha path 
) [read]

Definition at line 136 of file acl.c.

References ast_log(), AST_SENSE_ALLOW, AST_SENSE_DENY, free, LOG_DEBUG, LOG_WARNING, malloc, ast_ha::netaddr, ast_ha::netmask, ast_ha::next, and ast_ha::sense.

Referenced by add_calltoken_ignore(), authenticate(), build_callno_limits(), build_device(), build_gateway(), build_peer(), build_user(), and reload_config().

00137 {
00138    struct ast_ha *ha = malloc(sizeof(struct ast_ha));
00139    char *nm = "255.255.255.255";
00140    char tmp[256];
00141    struct ast_ha *prev = NULL;
00142    struct ast_ha *ret;
00143    int x, z;
00144    unsigned int y;
00145    ret = path;
00146    while (path) {
00147       prev = path;
00148       path = path->next;
00149    }
00150    if (ha) {
00151       ast_copy_string(tmp, stuff, sizeof(tmp));
00152       nm = strchr(tmp, '/');
00153       if (!nm) {
00154          nm = "255.255.255.255";
00155       } else {
00156          *nm = '\0';
00157          nm++;
00158       }
00159       if (!strchr(nm, '.')) {
00160          if ((sscanf(nm, "%30d", &x) == 1) && (x >= 0) && (x <= 32)) {
00161             y = 0;
00162             for (z=0;z<x;z++) {
00163                y >>= 1;
00164                y |= 0x80000000;
00165             }
00166             ha->netmask.s_addr = htonl(y);
00167          }
00168       } else if (!inet_aton(nm, &ha->netmask)) {
00169          ast_log(LOG_WARNING, "%s is not a valid netmask\n", nm);
00170          free(ha);
00171          return ret;
00172       }
00173       if (!inet_aton(tmp, &ha->netaddr)) {
00174          ast_log(LOG_WARNING, "%s is not a valid IP\n", tmp);
00175          free(ha);
00176          return ret;
00177       }
00178       ha->netaddr.s_addr &= ha->netmask.s_addr;
00179       if (!strncasecmp(sense, "p", 1)) {
00180          ha->sense = AST_SENSE_ALLOW;
00181       } else {
00182          ha->sense = AST_SENSE_DENY;
00183       }
00184       ha->next = NULL;
00185       if (prev) {
00186          prev->next = ha;
00187       } else {
00188          ret = ha;
00189       }
00190    }
00191    ast_log(LOG_DEBUG, "%s/%s appended to acl for peer\n", stuff, nm);
00192    return ret;
00193 }

int ast_apply_ha ( struct ast_ha ha,
struct sockaddr_in *  sin 
)

Definition at line 195 of file acl.c.

References ast_inet_ntoa(), ast_log(), AST_SENSE_ALLOW, LOG_DEBUG, ast_ha::netaddr, ast_ha::netmask, ast_ha::next, and ast_ha::sense.

Referenced by ast_sip_ouraddrfor(), authenticate(), check_access(), check_user_full(), register_verify(), and skinny_register().

00196 {
00197    /* Start optimistic */
00198    int res = AST_SENSE_ALLOW;
00199    while (ha) {
00200       char iabuf[INET_ADDRSTRLEN];
00201       char iabuf2[INET_ADDRSTRLEN];
00202       /* DEBUG */
00203       ast_log(LOG_DEBUG,
00204          "##### Testing %s with %s\n",
00205          ast_inet_ntoa(iabuf, sizeof(iabuf), sin->sin_addr),
00206          ast_inet_ntoa(iabuf2, sizeof(iabuf2), ha->netaddr));
00207       /* For each rule, if this address and the netmask = the net address
00208          apply the current rule */
00209       if ((sin->sin_addr.s_addr & ha->netmask.s_addr) == ha->netaddr.s_addr)
00210          res = ha->sense;
00211       ha = ha->next;
00212    }
00213    return res;
00214 }

void ast_copy_ha ( const struct ast_ha from,
struct ast_ha to 
)

Definition at line 97 of file acl.c.

References ast_ha::netaddr, ast_ha::netmask, and ast_ha::sense.

Referenced by add_calltoken_ignore(), ast_duplicate_ha(), and build_callno_limits().

00098 {
00099    memcpy(&to->netaddr, &from->netaddr, sizeof(from->netaddr));
00100    memcpy(&to->netmask, &from->netmask, sizeof(from->netmask));
00101    to->sense = from->sense;
00102 }

struct ast_ha* ast_duplicate_ha_list ( struct ast_ha original  )  [read]

Definition at line 116 of file acl.c.

References ast_duplicate_ha(), and ast_ha::next.

00117 {
00118    struct ast_ha *start=original;
00119    struct ast_ha *ret = NULL;
00120    struct ast_ha *link,*prev=NULL;
00121 
00122    while (start) {
00123       link = ast_duplicate_ha(start);  /* Create copy of this object */
00124       if (prev)
00125          prev->next = link;      /* Link previous to this object */
00126 
00127       if (!ret) 
00128          ret = link;    /* Save starting point */
00129 
00130       start = start->next;    /* Go to next object */
00131       prev = link;         /* Save pointer to this object */
00132    }
00133    return ret;             /* Return start of list */
00134 }

int ast_find_ourip ( struct in_addr *  ourip,
struct sockaddr_in  bindaddr 
)

Definition at line 320 of file acl.c.

References ast_gethostbyname(), ast_log(), ast_ouraddrfor(), hp, LOG_WARNING, and ourhost.

Referenced by reload_config().

00321 {
00322    char ourhost[MAXHOSTNAMELEN] = "";
00323    struct ast_hostent ahp;
00324    struct hostent *hp;
00325    struct in_addr saddr;
00326 
00327    /* just use the bind address if it is nonzero */
00328    if (ntohl(bindaddr.sin_addr.s_addr)) {
00329       memcpy(ourip, &bindaddr.sin_addr, sizeof(*ourip));
00330       return 0;
00331    }
00332    /* try to use our hostname */
00333    if (gethostname(ourhost, sizeof(ourhost) - 1)) {
00334       ast_log(LOG_WARNING, "Unable to get hostname\n");
00335    } else {
00336       hp = ast_gethostbyname(ourhost, &ahp);
00337       if (hp) {
00338          memcpy(ourip, hp->h_addr, sizeof(*ourip));
00339          return 0;
00340       }
00341    }
00342    /* A.ROOT-SERVERS.NET. */
00343    if (inet_aton("198.41.0.4", &saddr) && !ast_ouraddrfor(&saddr, ourip))
00344       return 0;
00345    return -1;
00346 }

void ast_free_ha ( struct ast_ha ha  ) 

Definition at line 86 of file acl.c.

References free, and ast_ha::next.

Referenced by add_calltoken_ignore(), authenticate(), build_callno_limits(), build_peer(), build_user(), destroy_gateway(), destroy_peer(), destroy_user(), reload_config(), sip_destroy_peer(), sip_destroy_user(), and unload_module().

00087 {
00088    struct ast_ha *hal;
00089    while(ha) {
00090       hal = ha;
00091       ha = ha->next;
00092       free(hal);
00093    }
00094 }

int ast_get_ip ( struct sockaddr_in *  sin,
const char *  value 
)

Definition at line 262 of file acl.c.

References ast_get_ip_or_srv().

Referenced by build_device(), build_gateway(), build_peer(), build_user(), and peer_set_srcaddr().

00263 {
00264    return ast_get_ip_or_srv(sin, value, NULL);
00265 }

int ast_get_ip_or_srv ( struct sockaddr_in *  sin,
const char *  value,
const char *  service 
)

Definition at line 216 of file acl.c.

References ast_get_srv(), ast_gethostbyname(), ast_log(), host, hp, and LOG_WARNING.

Referenced by ast_get_ip(), build_peer(), and reload_config().

00217 {
00218    struct hostent *hp;
00219    struct ast_hostent ahp;
00220    char srv[256];
00221    char host[256];
00222    int tportno = ntohs(sin->sin_port);
00223    if (inet_aton(value, &sin->sin_addr))
00224       return 0;
00225    if (service) {
00226       snprintf(srv, sizeof(srv), "%s.%s", service, value);
00227       if (ast_get_srv(NULL, host, sizeof(host), &tportno, srv) > 0) {
00228          sin->sin_port = htons(tportno);
00229          value = host;
00230       }
00231    }
00232    hp = ast_gethostbyname(value, &ahp);
00233    if (hp) {
00234       memcpy(&sin->sin_addr, hp->h_addr, sizeof(sin->sin_addr));
00235    } else {
00236       ast_log(LOG_WARNING, "Unable to lookup '%s'\n", value);
00237       return -1;
00238    }
00239    return 0;
00240 }

int ast_lookup_iface ( char *  iface,
struct in_addr *  address 
)

Definition at line 268 of file acl.c.

References ast_log(), my_ifreq::ifrn_name, my_ifreq::ifru_addr, and LOG_WARNING.

00269 {
00270    int mysock, res = 0;
00271    struct my_ifreq ifreq;
00272 
00273    memset(&ifreq, 0, sizeof(ifreq));
00274    ast_copy_string(ifreq.ifrn_name, iface, sizeof(ifreq.ifrn_name));
00275 
00276    mysock = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
00277    res = ioctl(mysock, SIOCGIFADDR, &ifreq);
00278 
00279    close(mysock);
00280    if (res < 0) {
00281       ast_log(LOG_WARNING, "Unable to get IP of %s: %s\n", iface, strerror(errno));
00282       memcpy((char *)address, (char *)&__ourip, sizeof(__ourip));
00283       return -1;
00284    } else {
00285       memcpy((char *)address, (char *)&ifreq.ifru_addr.sin_addr, sizeof(ifreq.ifru_addr.sin_addr));
00286       return 0;
00287    }
00288 }

int ast_ouraddrfor ( struct in_addr *  them,
struct in_addr *  us 
)

Definition at line 290 of file acl.c.

References ast_log(), LOG_WARNING, and s.

Referenced by ast_find_ourip(), ast_sip_ouraddrfor(), build_device(), build_gateway(), and find_subchannel_and_lock().

00291 {
00292    int s;
00293    struct sockaddr_in sin;
00294    socklen_t slen;
00295 
00296    s = socket(PF_INET, SOCK_DGRAM, 0);
00297    if (s < 0) {
00298       ast_log(LOG_WARNING, "Cannot create socket\n");
00299       return -1;
00300    }
00301    sin.sin_family = AF_INET;
00302    sin.sin_port = 5060;
00303    sin.sin_addr = *them;
00304    if (connect(s, (struct sockaddr *)&sin, sizeof(sin))) {
00305       ast_log(LOG_WARNING, "Cannot connect\n");
00306       close(s);
00307       return -1;
00308    }
00309    slen = sizeof(sin);
00310    if (getsockname(s, (struct sockaddr *)&sin, &slen)) {
00311       ast_log(LOG_WARNING, "Cannot get socket name\n");
00312       close(s);
00313       return -1;
00314    }
00315    close(s);
00316    *us = sin.sin_addr;
00317    return 0;
00318 }

int ast_str2tos ( const char *  value,
int *  tos 
)

Definition at line 242 of file acl.c.

References IPTOS_MINCOST.

Referenced by reload_config(), and set_config().

00243 {
00244    int fval;
00245    if (sscanf(value, "%30i", &fval) == 1)
00246       *tos = fval & 0xff;
00247    else if (!strcasecmp(value, "lowdelay"))
00248       *tos = IPTOS_LOWDELAY;
00249    else if (!strcasecmp(value, "throughput"))
00250       *tos = IPTOS_THROUGHPUT;
00251    else if (!strcasecmp(value, "reliability"))
00252       *tos = IPTOS_RELIABILITY;
00253    else if (!strcasecmp(value, "mincost"))
00254       *tos = IPTOS_MINCOST;
00255    else if (!strcasecmp(value, "none"))
00256       *tos = 0;
00257    else
00258       return -1;
00259    return 0;
00260 }


Generated on Wed Oct 28 15:47:56 2009 for Asterisk - the Open Source PBX by  doxygen 1.5.6