PostgreSQL Source Code  git master
ip.c File Reference
#include "postgres.h"
#include <unistd.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <sys/file.h>
#include "common/ip.h"
Include dependency graph for ip.c:

Go to the source code of this file.

Functions

static int getaddrinfo_unix (const char *path, const struct addrinfo *hintsp, struct addrinfo **result)
 
static int getnameinfo_unix (const struct sockaddr_un *sa, int salen, char *node, int nodelen, char *service, int servicelen, int flags)
 
int pg_getaddrinfo_all (const char *hostname, const char *servname, const struct addrinfo *hintp, struct addrinfo **result)
 
void pg_freeaddrinfo_all (int hint_ai_family, struct addrinfo *ai)
 
int pg_getnameinfo_all (const struct sockaddr_storage *addr, int salen, char *node, int nodelen, char *service, int servicelen, int flags)
 

Function Documentation

◆ getaddrinfo_unix()

static int getaddrinfo_unix ( const char *  path,
const struct addrinfo *  hintsp,
struct addrinfo **  result 
)
static

Definition at line 153 of file ip.c.

155 {
156  struct addrinfo hints = {0};
157  struct addrinfo *aip;
158  struct sockaddr_un *unp;
159 
160  *result = NULL;
161 
162  if (strlen(path) >= sizeof(unp->sun_path))
163  return EAI_FAIL;
164 
165  if (hintsp == NULL)
166  {
167  hints.ai_family = AF_UNIX;
168  hints.ai_socktype = SOCK_STREAM;
169  }
170  else
171  memcpy(&hints, hintsp, sizeof(hints));
172 
173  if (hints.ai_socktype == 0)
174  hints.ai_socktype = SOCK_STREAM;
175 
176  if (hints.ai_family != AF_UNIX)
177  {
178  /* shouldn't have been called */
179  return EAI_FAIL;
180  }
181 
182  aip = calloc(1, sizeof(struct addrinfo));
183  if (aip == NULL)
184  return EAI_MEMORY;
185 
186  unp = calloc(1, sizeof(struct sockaddr_un));
187  if (unp == NULL)
188  {
189  free(aip);
190  return EAI_MEMORY;
191  }
192 
193  aip->ai_family = AF_UNIX;
194  aip->ai_socktype = hints.ai_socktype;
195  aip->ai_protocol = hints.ai_protocol;
196  aip->ai_next = NULL;
197  aip->ai_canonname = NULL;
198  *result = aip;
199 
200  unp->sun_family = AF_UNIX;
201  aip->ai_addr = (struct sockaddr *) unp;
202  aip->ai_addrlen = sizeof(struct sockaddr_un);
203 
204  strcpy(unp->sun_path, path);
205 
206  /*
207  * If the supplied path starts with @, replace that with a zero byte for
208  * the internal representation. In that mode, the entire sun_path is the
209  * address, including trailing zero bytes. But we set the address length
210  * to only include the length of the original string. That way the
211  * trailing zero bytes won't show up in any network or socket lists of the
212  * operating system. This is just a convention, also followed by other
213  * packages.
214  */
215  if (path[0] == '@')
216  {
217  unp->sun_path[0] = '\0';
218  aip->ai_addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(path);
219  }
220 
221  return 0;
222 }
#define calloc(a, b)
Definition: header.h:55
#define free(a)
Definition: header.h:65
Definition: un.h:12
unsigned short sun_family
Definition: un.h:13
char sun_path[108]
Definition: un.h:14

References calloc, free, sockaddr_un::sun_family, and sockaddr_un::sun_path.

Referenced by pg_getaddrinfo_all().

◆ getnameinfo_unix()

static int getnameinfo_unix ( const struct sockaddr_un sa,
int  salen,
char *  node,
int  nodelen,
char *  service,
int  servicelen,
int  flags 
)
static

Definition at line 228 of file ip.c.

232 {
233  int ret;
234 
235  /* Invalid arguments. */
236  if (sa == NULL || sa->sun_family != AF_UNIX ||
237  (node == NULL && service == NULL))
238  return EAI_FAIL;
239 
240  if (node)
241  {
242  ret = snprintf(node, nodelen, "%s", "[local]");
243  if (ret < 0 || ret >= nodelen)
244  return EAI_MEMORY;
245  }
246 
247  if (service)
248  {
249  /*
250  * Check whether it looks like an abstract socket, but it could also
251  * just be an empty string.
252  */
253  if (sa->sun_path[0] == '\0' && sa->sun_path[1] != '\0')
254  ret = snprintf(service, servicelen, "@%s", sa->sun_path + 1);
255  else
256  ret = snprintf(service, servicelen, "%s", sa->sun_path);
257  if (ret < 0 || ret >= servicelen)
258  return EAI_MEMORY;
259  }
260 
261  return 0;
262 }
#define snprintf
Definition: port.h:238

References snprintf.

Referenced by pg_getnameinfo_all().

◆ pg_freeaddrinfo_all()

void pg_freeaddrinfo_all ( int  hint_ai_family,
struct addrinfo *  ai 
)

Definition at line 82 of file ip.c.

83 {
84  if (hint_ai_family == AF_UNIX)
85  {
86  /* struct was built by getaddrinfo_unix (see pg_getaddrinfo_all) */
87  while (ai != NULL)
88  {
89  struct addrinfo *p = ai;
90 
91  ai = ai->ai_next;
92  free(p->ai_addr);
93  free(p);
94  }
95  }
96  else
97  {
98  /* struct was built by getaddrinfo() */
99  if (ai != NULL)
100  freeaddrinfo(ai);
101  }
102 }

References free.

Referenced by ident_inet(), parse_hba_auth_opt(), parse_hba_line(), PerformRadiusTransaction(), release_conn_addrinfo(), and StreamServerPort().

◆ pg_getaddrinfo_all()

int pg_getaddrinfo_all ( const char *  hostname,
const char *  servname,
const struct addrinfo *  hintp,
struct addrinfo **  result 
)

Definition at line 53 of file ip.c.

55 {
56  int rc;
57 
58  /* not all versions of getaddrinfo() zero *result on failure */
59  *result = NULL;
60 
61  if (hintp->ai_family == AF_UNIX)
62  return getaddrinfo_unix(servname, hintp, result);
63 
64  /* NULL has special meaning to getaddrinfo(). */
65  rc = getaddrinfo((!hostname || hostname[0] == '\0') ? NULL : hostname,
66  servname, hintp, result);
67 
68  return rc;
69 }
static int getaddrinfo_unix(const char *path, const struct addrinfo *hintsp, struct addrinfo **result)
Definition: ip.c:153
static char * hostname
Definition: pg_regress.c:89

References getaddrinfo_unix(), and hostname.

Referenced by ident_inet(), parse_hba_auth_opt(), parse_hba_line(), PerformRadiusTransaction(), PQconnectPoll(), and StreamServerPort().

◆ pg_getnameinfo_all()

int pg_getnameinfo_all ( const struct sockaddr_storage *  addr,
int  salen,
char *  node,
int  nodelen,
char *  service,
int  servicelen,
int  flags 
)

Definition at line 114 of file ip.c.

118 {
119  int rc;
120 
121  if (addr && addr->ss_family == AF_UNIX)
122  rc = getnameinfo_unix((const struct sockaddr_un *) addr, salen,
123  node, nodelen,
124  service, servicelen,
125  flags);
126  else
127  rc = getnameinfo((const struct sockaddr *) addr, salen,
128  node, nodelen,
129  service, servicelen,
130  flags);
131 
132  if (rc != 0)
133  {
134  if (node)
135  strlcpy(node, "???", nodelen);
136  if (service)
137  strlcpy(service, "???", servicelen);
138  }
139 
140  return rc;
141 }
static int getnameinfo_unix(const struct sockaddr_un *sa, int salen, char *node, int nodelen, char *service, int servicelen, int flags)
Definition: ip.c:228
size_t strlcpy(char *dst, const char *src, size_t siz)
Definition: strlcpy.c:45

References getnameinfo_unix(), and strlcpy().

Referenced by BackendInitialize(), check_hostname(), ClientAuthentication(), emitHostIdentityInfo(), fill_hba_line(), ident_inet(), inet_client_addr(), inet_client_port(), inet_server_addr(), inet_server_port(), pg_stat_get_activity(), pg_stat_get_backend_client_addr(), pg_stat_get_backend_client_port(), and StreamServerPort().