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Viewing changes to plugin-helpers/mandos-client-iprouteadddel.c

  • Committer: Teddy Hogeborn
  • Date: 2024-11-17 16:53:00 UTC
  • Revision ID: teddy@recompile.se-20241117165300-02hxm96s8cj9528e
mandos: Avoid closing configured server network socket

If we are passed a pre-created created network socket as a file
descriptor, we must avoid later closing it (when stdin, stdout and
stderr are dup2()ed over with /dev/null) by making sure that the
network file descriptor is not 0, 1, or 2, by creating a new file
descriptor if necessary.

However, when we create a new file descriptor we must check that the
new file descriptor is not 0, 1, or 2 either, and try again until we
get a suitable file descriptor.

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Lines of Context:
plugin-helpers/mandos-client-iprouteadddel.c
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/* 
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 * iprouteadddel - Add or delete direct route to a local IP address
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 * 
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 * Copyright © 2015-2018 Teddy Hogeborn
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 * Copyright © 2015-2018 Björn Påhlsson
 
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 * Copyright © 2015-2018, 2021-2022 Teddy Hogeborn
 
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 * Copyright © 2015-2018, 2021-2022 Björn Påhlsson
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 * 
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 * This file is part of Mandos.
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 * 
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 * Contact the authors at <mandos@recompile.se>.
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 */
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#define _GNU_SOURCE             /* asprintf(),
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                                   program_invocation_short_name */
 
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#define _GNU_SOURCE             /* program_invocation_short_name */
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#include <stdbool.h>            /* bool, false, true */
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#include <stdio.h>              /* fprintf(), stderr, FILE, vfprintf */
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#include <errno.h>              /* program_invocation_short_name,
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                                   errno, perror(), EINVAL, ENOMEM */
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#include <stdarg.h>             /* va_list, va_start */
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#include <stdlib.h>             /* EXIT_SUCCESS */
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#include <argp.h>               /* struct argp_option, error_t, struct
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                                   argp_state, ARGP_KEY_ARG,
 
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#include <argp.h>               /* argp_program_version,
 
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                                   argp_program_bug_address,
 
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                                   struct argp_option,
 
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                                   struct argp_state, ARGP_KEY_ARG,
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                                   argp_usage(), ARGP_KEY_END,
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                                   ARGP_ERR_UNKNOWN, struct argp,
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                                   argp_parse() */
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#include <sysexits.h>           /* EX_USAGE, EX_OSERR */
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#include <netinet/ip.h>         /* sa_family_t, AF_INET6, AF_INET */
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#include <inttypes.h>           /* PRIdMAX, intmax_t */
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                                   argp_parse(), ARGP_IN_ORDER */
 
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#include <errno.h>              /* errno,
 
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                                   program_invocation_short_name,
 
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                                   error_t, EINVAL, ENOMEM */
 
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#include <stdio.h>              /* fprintf(), stderr, perror(), FILE,
 
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                                   vfprintf() */
 
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#include <stdarg.h>             /* va_list, va_start(), vfprintf() */
 
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#include <stdlib.h>             /* EXIT_SUCCESS */
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#include <netlink/netlink.h>    /* struct nl_addr, nl_addr_parse(),
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                                   nl_geterror(),
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                                   nl_addr_get_family(),
 
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                                   nl_addr_get_family(), NLM_F_EXCL,
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                                   nl_addr_put() */
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#include <netlink/route/route.h> /* struct rtnl_route,
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                                    struct rtnl_nexthop,
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                                    rtnl_route_alloc(),
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                                    rtnl_route_set_family(),
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                                    rtnl_route_set_protocol(),
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                                    RTPROT_BOOT,
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                                    rtnl_route_set_scope(),
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                                    RT_SCOPE_LINK,
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                                    rtnl_route_set_type(),
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                                    RTN_UNICAST,
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                                    rtnl_route_set_dst(),
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                                    rtnl_route_set_table(),
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                                    RT_TABLE_MAIN,
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                                    rtnl_route_nh_alloc(),
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                                    rtnl_route_nh_set_ifindex(),
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                                    rtnl_route_add_nexthop(),
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                                    rtnl_route_add(),
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                                    rtnl_route_delete(),
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                                    rtnl_route_put(),
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                                    rtnl_route_nh_free() */
 
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#include <stddef.h>             /* NULL */
 
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#include <netlink/route/route.h>/* struct rtnl_route,
 
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                                   struct rtnl_nexthop, NETLINK_ROUTE,
 
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                                   rtnl_route_alloc(),
 
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                                   rtnl_route_set_family(),
 
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                                   rtnl_route_set_protocol(),
 
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                                   RTPROT_BOOT,
 
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                                   rtnl_route_set_scope(),
 
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                                   RT_SCOPE_LINK,
 
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                                   rtnl_route_set_type(), RTN_UNICAST,
 
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                                   rtnl_route_set_dst(),
 
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                                   rtnl_route_set_table(),
 
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                                   RT_TABLE_MAIN,
 
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                                   rtnl_route_nh_alloc(),
 
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                                   rtnl_route_nh_set_ifindex(),
 
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                                   rtnl_route_add_nexthop(),
 
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                                   rtnl_route_add(),
 
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                                   rtnl_route_delete(),
 
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                                   rtnl_route_put(),
 
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                                   rtnl_route_nh_free() */
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#include <netlink/socket.h>     /* struct nl_sock, nl_socket_alloc(),
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                                   nl_connect(), nl_socket_free() */
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#include <netlink/route/link.h> /* rtnl_link_get_kernel(),
 
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#include <strings.h>            /* strcasecmp() */
 
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#include <sys/socket.h>         /* AF_UNSPEC, AF_INET6, AF_INET */
 
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#include <sysexits.h>           /* EX_USAGE, EX_OSERR */
 
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#include <netlink/route/link.h> /* struct rtnl_link,
 
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                                   rtnl_link_get_kernel(),
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                                   rtnl_link_get_ifindex(),
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                                   rtnl_link_put() */
 
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#include <netinet/in.h>         /* sa_family_t */
 
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#include <inttypes.h>           /* PRIdMAX, intmax_t */
 
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#include <stdint.h>             /* uint8_t */
 
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bool debug = false;
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const char *argp_program_version = "mandos-client-iprouteadddel " VERSION;
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__attribute__((format (gnu_printf, 2, 3), nonnull))
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int fprintf_plus(FILE *stream, const char *format, ...){
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  va_list ap;
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  va_start (ap, format);
 
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  va_start(ap, format);
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  fprintf(stream, "Mandos plugin helper %s: ",
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          program_invocation_short_name);
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  }
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  /* Set interface index number on nexthop object */
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  rtnl_route_nh_set_ifindex(nexthop, ifindex);
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  /* Set route tu use nexthop object */
 
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  /* Set route to use nexthop object */
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  rtnl_route_add_nexthop(route, nexthop);
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  /* Add or delete route? */
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  if(arguments.add){