291 lines
9.1 KiB
C
291 lines
9.1 KiB
C
/*-*- Mode: C; c-basic-offset: 8 -*-*/
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#include <assert.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <arpa/inet.h>
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#include <stdio.h>
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#include "macro.h"
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#include "util.h"
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#include "socket-util.h"
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int address_parse(Address *a, const char *s) {
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int r;
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char *e, *n;
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unsigned u;
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assert(a);
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assert(s);
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memset(a, 0, sizeof(*a));
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if (*s == '[') {
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/* IPv6 in [x:.....:z]:p notation */
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if (!(e = strchr(s+1, ']')))
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return -EINVAL;
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if (!(n = strndup(s+1, e-s-1)))
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return -ENOMEM;
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errno = 0;
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if (inet_pton(AF_INET6, n, &a->sockaddr.in6.sin6_addr) <= 0) {
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free(n);
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return errno != 0 ? -errno : -EINVAL;
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}
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free(n);
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e++;
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if (*e != ':')
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return -EINVAL;
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e++;
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if ((r = safe_atou(e, &u)) < 0)
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return r;
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if (u <= 0 || u > 0xFFFF)
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return -EINVAL;
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a->sockaddr.in6.sin6_family = AF_INET6;
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a->sockaddr.in6.sin6_port = htons((uint16_t) u);
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a->size = sizeof(struct sockaddr_in6);
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a->bind_ipv6_only = true;
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} else if (*s == '/') {
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/* AF_UNIX socket */
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size_t l;
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l = strlen(s);
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if (l >= sizeof(a->sockaddr.un.sun_path))
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return -EINVAL;
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a->sockaddr.un.sun_family = AF_UNIX;
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memcpy(a->sockaddr.un.sun_path, s, l);
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a->size = sizeof(sa_family_t) + l + 1;
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} else if (*s == '=') {
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/* Abstract AF_UNIX socket */
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size_t l;
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l = strlen(s+1);
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if (l >= sizeof(a->sockaddr.un.sun_path) - 1)
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return -EINVAL;
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a->sockaddr.un.sun_family = AF_UNIX;
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memcpy(a->sockaddr.un.sun_path+1, s+1, l);
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a->size = sizeof(struct sockaddr_un);
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} else {
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if ((e = strchr(s, ':'))) {
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/* IPv4 in w.x.y.z:p notation */
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if (!(n = strndup(s, e-s)))
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return -ENOMEM;
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errno = 0;
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if (inet_pton(AF_INET, n, &a->sockaddr.in4.sin_addr) <= 0) {
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free(n);
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return errno != 0 ? -errno : -EINVAL;
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}
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free(n);
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e++;
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if ((r = safe_atou(e, &u)) < 0)
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return r;
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if (u <= 0 || u > 0xFFFF)
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return -EINVAL;
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a->sockaddr.in4.sin_family = AF_INET;
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a->sockaddr.in4.sin_port = htons((uint16_t) u);
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a->size = sizeof(struct sockaddr_in);
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} else {
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/* Just a port */
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if ((r = safe_atou(s, &u)) < 0)
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return r;
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if (u <= 0 || u > 0xFFFF)
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return -EINVAL;
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a->sockaddr.in6.sin6_family = AF_INET6;
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memcpy(&a->sockaddr.in6.sin6_addr, &in6addr_any, INET6_ADDRSTRLEN);
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a->sockaddr.in6.sin6_port = htons((uint16_t) u);
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a->size = sizeof(struct sockaddr_in6);
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}
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}
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return 0;
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}
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int address_verify(const Address *a) {
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assert(a);
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switch (address_family(a)) {
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case AF_INET:
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if (a->size != sizeof(struct sockaddr_in))
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return -EINVAL;
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if (a->sockaddr.in4.sin_port == 0)
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return -EINVAL;
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return 0;
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case AF_INET6:
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if (a->size != sizeof(struct sockaddr_in6))
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return -EINVAL;
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if (a->sockaddr.in6.sin6_port == 0)
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return -EINVAL;
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return 0;
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case AF_UNIX:
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if (a->size < sizeof(sa_family_t))
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return -EINVAL;
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if (a->size > sizeof(sa_family_t)) {
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if (a->sockaddr.un.sun_path[0] == 0) {
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/* abstract */
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if (a->size != sizeof(struct sockaddr_un))
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return -EINVAL;
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} else {
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char *e;
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/* path */
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if (!(e = memchr(a->sockaddr.un.sun_path, 0, sizeof(a->sockaddr.un.sun_path))))
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return -EINVAL;
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if (a->size != sizeof(sa_family_t) + (e - a->sockaddr.un.sun_path) + 1)
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return -EINVAL;
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}
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}
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return 0;
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default:
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return -EAFNOSUPPORT;
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}
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}
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int address_print(const Address *a, char **p) {
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int r;
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assert(a);
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assert(p);
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if ((r = address_verify(a)) < 0)
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return r;
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switch (address_family(a)) {
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case AF_INET: {
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char *ret;
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if (!(ret = new(char, INET_ADDRSTRLEN+1+5+1)))
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return -ENOMEM;
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if (!inet_ntop(AF_INET, &a->sockaddr.in4.sin_addr, ret, INET_ADDRSTRLEN)) {
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free(ret);
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return -errno;
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}
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sprintf(strchr(ret, 0), ":%u", ntohs(a->sockaddr.in4.sin_port));
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*p = ret;
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return 0;
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}
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case AF_INET6: {
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char *ret;
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if (!(ret = new(char, 1+INET6_ADDRSTRLEN+2+5+1)))
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return -ENOMEM;
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ret[0] = '[';
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if (!inet_ntop(AF_INET6, &a->sockaddr.in6.sin6_addr, ret+1, INET6_ADDRSTRLEN)) {
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free(ret);
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return -errno;
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}
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sprintf(strchr(ret, 0), "]:%u", ntohs(a->sockaddr.in6.sin6_port));
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*p = ret;
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return 0;
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}
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case AF_UNIX: {
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char *ret;
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if (a->size <= sizeof(sa_family_t)) {
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if (!(ret = strdup("<unamed>")))
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return -ENOMEM;
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} else if (a->sockaddr.un.sun_path[0] == 0) {
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/* abstract */
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/* FIXME: We assume we can print the
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* socket path here and that it hasn't
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* more than one NUL byte. That is
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* actually an invalid assumption */
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if (!(ret = new(char, sizeof(a->sockaddr.un.sun_path)+1)))
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return -ENOMEM;
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ret[0] = '=';
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memcpy(ret+1, a->sockaddr.un.sun_path+1, sizeof(a->sockaddr.un.sun_path)-1);
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ret[sizeof(a->sockaddr.un.sun_path)] = 0;
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} else {
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if (!(ret = strdup(a->sockaddr.un.sun_path)))
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return -ENOMEM;
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}
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*p = ret;
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return 0;
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}
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default:
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return -EINVAL;
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}
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}
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int address_listen(const Address *a, int backlog) {
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int r, fd;
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assert(a);
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if ((r = address_verify(a)) < 0)
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return r;
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if ((fd = socket(address_family(a), a->type, 0)) < 0)
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return -errno;
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if (bind(fd, &a->sockaddr.sa, a->size) < 0) {
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close_nointr(fd);
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return -errno;
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}
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if (a->type == SOCK_STREAM)
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if (listen(fd, backlog) < 0) {
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close_nointr(fd);
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return -errno;
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}
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if (address_family(a) == AF_INET6) {
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int flag = a->bind_ipv6_only;
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if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &flag, sizeof(flag)) < 0) {
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close_nointr(fd);
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return -errno;
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}
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}
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return 0;
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}
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