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annotate toys/pending/nbd_client.c @ 1005:03f72b57a092

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DHCP client and server, from Ashwini Sharma.
author Rob Landley <rob@landley.net>
date Wed, 14 Aug 2013 19:09:33 -0500
parents 6f5fed66c722
children e11684e3bbc5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* vi: set sw=4 ts=4:
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2 *
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3 * nbd-client.c - network block device client
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4 *
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5 * Copyright 2010 Rob Landley <rob@landley.net>
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6 *
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7 * Not in SUSv4.
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8
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9 USE_NBD_CLIENT(NEWTOY(nbd_client, "<3>3ns", TOYFLAG_USR|TOYFLAG_BIN))
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10
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11 config NBD_CLIENT
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12 bool "nbd-client"
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13 default n
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14 help
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15 usage: nbd-client [-ns] HOST PORT DEVICE
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16
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17 -n Do not fork into background
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18 -s nbd swap support (lock server into memory)
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19 */
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20
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21 /*
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22 Usage: nbd-client [-sSpn] [-b BLKSZ] [-t SECS] [-N name] HOST PORT DEVICE
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23
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24 -b block size
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25 -t timeout in seconds
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26 -S sdp
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27 -p persist
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28 -n nofork
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29 -d DEVICE
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30 -c DEVICE
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31 */
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32
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33 #define FOR_nbd_client
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34 #include "toys.h"
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35 #include "toynet.h"
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36
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37 #define NBD_SET_SOCK _IO(0xab, 0)
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38 #define NBD_SET_BLKSIZE _IO(0xab, 1)
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39 #define NBD_SET_SIZE _IO(0xab, 2)
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40 #define NBD_DO_IT _IO(0xab, 3)
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41 #define NBD_CLEAR_SOCK _IO(0xab, 4)
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42 #define NBD_CLEAR_QUEUE _IO(0xab, 5)
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43 #define NBD_PRINT_DEBUG _IO(0xab, 6)
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44 #define NBD_SET_SIZE_BLOCKS _IO(0xab, 7)
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45 #define NBD_DISCONNECT _IO(0xab, 8)
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46 #define NBD_SET_TIMEOUT _IO(0xab, 9)
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47
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48 void nbd_client_main(void)
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49 {
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50 int sock = -1, nbd, flags;
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51 unsigned long timeout = 0;
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52 struct addrinfo *addr, *p;
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53 char *host=toys.optargs[0], *port=toys.optargs[1], *device=toys.optargs[2];
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54 uint64_t devsize;
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55
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56 // Repeat until spanked
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57
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58 nbd = xopen(device, O_RDWR);
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59 for (;;) {
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60 int temp;
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61 struct addrinfo hints;
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62
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63 // Find and connect to server
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64
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65 memset(&hints, 0, sizeof(hints));
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66 hints.ai_family = PF_UNSPEC;
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67 hints.ai_socktype = SOCK_STREAM;
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68 if (getaddrinfo(host, port, &hints, &addr)) addr = 0;
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69 for (p = addr; p; p = p->ai_next) {
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70 sock = socket(p->ai_family, p->ai_socktype, p->ai_protocol);
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71 if (-1 != connect(sock, p->ai_addr, p->ai_addrlen)) break;
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72 close(sock);
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73 }
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74 freeaddrinfo(addr);
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75
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76 if (!p) perror_exit("%s:%s", host, port);
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77
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78 temp = 1;
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79 setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &temp, sizeof(int));
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80
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81 // Read login data
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82
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83 xreadall(sock, toybuf, 152);
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84 if (memcmp(toybuf, "NBDMAGIC\x00\x00\x42\x02\x81\x86\x12\x53", 16))
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85 error_exit("bad login %s:%s", host, port);
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86 devsize = SWAP_BE64(*(uint64_t *)(toybuf+16));
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87 flags = SWAP_BE32(*(int *)(toybuf+24));
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88
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89 // Set 4k block size. Everything uses that these days.
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90 ioctl(nbd, NBD_SET_BLKSIZE, 4096);
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91 ioctl(nbd, NBD_SET_SIZE_BLOCKS, devsize/4096);
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92 ioctl(nbd, NBD_CLEAR_SOCK);
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93
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94 // If the sucker was exported read only, respect that locally.
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95 temp = (flags & 2) ? 1 : 0;
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96 xioctl(nbd, BLKROSET, &temp);
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97
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98 if (timeout && ioctl(nbd, NBD_SET_TIMEOUT, timeout)<0) break;
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99 if (ioctl(nbd, NBD_SET_SOCK, sock) < 0) break;
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100
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101 if (toys.optflags & FLAG_s) mlockall(MCL_CURRENT|MCL_FUTURE);
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102
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103 // Open the device to force reread of the partition table.
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104 if ((toys.optflags & FLAG_n) || !fork()) {
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105 char *s = strrchr(device, '/');
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106 int i;
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107
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108 sprintf(toybuf, "/sys/block/%.32s/pid", s ? s+1 : device);
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109 // Is it up yet? (Give it 10 seconds.)
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110 for (i=0; i<100; i++) {
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111 temp = open(toybuf, O_RDONLY);
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112 if (temp == -1) msleep(100);
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113 else {
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114 close(temp);
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115 break;
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116 }
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117 }
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118 close(open(device, O_RDONLY));
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119 if (!(toys.optflags & FLAG_n)) exit(0);
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120 }
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121
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122 // Daemonize here.
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123
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124 daemon(0,0);
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125
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126 // Process NBD requests until further notice.
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127
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128 if (ioctl(nbd, NBD_DO_IT)>=0 || errno==EBADR) break;
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129 close(sock);
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130 }
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131 close(nbd);
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132
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133 // Flush queue and exit.
84959a5529e8 The old nbd-client I wrote in 2010. Needs cleanup.
Rob Landley <rob@landley.net>
parents:
diff changeset
134
84959a5529e8 The old nbd-client I wrote in 2010. Needs cleanup.
Rob Landley <rob@landley.net>
parents:
diff changeset
135 ioctl(nbd, NBD_CLEAR_QUEUE);
84959a5529e8 The old nbd-client I wrote in 2010. Needs cleanup.
Rob Landley <rob@landley.net>
parents:
diff changeset
136 ioctl(nbd, NBD_CLEAR_SOCK);
84959a5529e8 The old nbd-client I wrote in 2010. Needs cleanup.
Rob Landley <rob@landley.net>
parents:
diff changeset
137 }