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src/lib/hostpid.c
79 строк
2 KB
Michael M Slusarz
COPYING: Simplify and standardize copyright handling
03 июл 2026, 02:25
03 июл 2026, 02:25
2a5809c
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/* Copyright (c) Dovecot authors, see top-level COPYING file */ #include "lib.h" #include "hostpid.h" #include <unistd.h> #include <netdb.h> #define HOSTNAME_DISALLOWED_CHARS "/\r\n\t" const char *my_hostname = NULL; const char *my_pid = NULL; static char *my_hostname_dup = NULL; static char *my_domain = NULL; void hostpid_init(void) { static char pid[MAX_INT_STRLEN]; char hostname[256]; const char *value; /* allow calling hostpid_init() multiple times to reset hostname */ i_free_and_null(my_hostname_dup); i_free_and_null(my_domain); value = getenv(MY_HOSTNAME_ENV); if (value == NULL) { if (gethostname(hostname, sizeof(hostname)-1) < 0) i_fatal("gethostname() failed: %m"); hostname[sizeof(hostname)-1] = '\0'; value = hostname; } if (value[0] == '\0' || strcspn(value, HOSTNAME_DISALLOWED_CHARS) != strlen(value)) i_fatal("Invalid system hostname: '%s'", value); my_hostname_dup = i_strdup(value); my_hostname = my_hostname_dup; i_snprintf(pid, sizeof(pid), "%lld", (long long)getpid()); my_pid = pid; } void hostpid_deinit(void) { i_free(my_hostname_dup); i_free(my_domain); } const char *my_hostdomain(void) { const char *name; const struct addrinfo hints = { .ai_family = AF_UNSPEC, .ai_socktype = SOCK_STREAM, .ai_flags = AI_CANONNAME, }; struct addrinfo *res; if (my_domain != NULL) return my_domain; name = getenv(MY_HOSTDOMAIN_ENV); if (name != NULL) { my_domain = i_strdup(name); return my_domain; } if (getaddrinfo(my_hostname, NULL, &hints, &res) == 0) { my_domain = i_strdup(res->ai_canonname); freeaddrinfo(res); return my_domain; } /* failed, use just the hostname */ my_domain = i_strdup(my_hostname); return my_domain; }